/* roulang page: index */
/* ===== Design Tokens ===== */
:root {
  --color-primary: #0f172a;
  --color-primary-light: #1e293b;
  --color-accent: #f43f5e;
  --color-accent-hover: #e11d48;
  --color-accent-soft: rgba(244, 63, 94, 0.12);
  --color-warning: #f59e0b;
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-dark: #0f172a;
  --color-text: #1e293b;
  --color-text-light: #64748b;
  --color-text-muted: #94a3b8;
  --color-border: #e2e8f0;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 999px;
  --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 48px rgba(15, 23, 42, 0.12);
  --font-base: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --container: 1200px;
  --spacing-section: 96px;
}

/* ===== Base / Reset ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-base);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-top: 72px;
}

img {
  max-width: 100%;
  display: block;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color 0.2s ease, background 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
}

button {
  font-family: inherit;
  cursor: pointer;
}

input,
textarea {
  font-family: inherit;
}

ul,
ol {
  list-style: none;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Section Common ===== */
.section {
  padding: var(--spacing-section) 0;
}

.section-header {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 56px;
}

.section-header .section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  background: var(--color-accent-soft);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(28px, 3.6vw, 40px);
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-primary);
  letter-spacing: -0.5px;
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-text-light);
  line-height: 1.75;
}

/* ===== Button ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-full);
  font-size: 15px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  line-height: 1.4;
  white-space: nowrap;
}

.btn--accent {
  background: var(--color-accent);
  color: #fff;
  box-shadow: 0 8px 20px rgba(244, 63, 94, 0.25);
}

.btn--accent:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(244, 63, 94, 0.32);
}

.btn--ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: #fff;
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.7);
  transform: translateY(-2px);
}

.btn--dark {
  background: var(--color-primary);
  color: #fff;
}

.btn--dark:hover {
  background: #1e293b;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

/* ===== Header / Nav ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 999;
  background: rgba(10, 15, 26, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.navbar {
  max-width: var(--container);
  margin: 0 auto;
  height: 72px;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand__logo {
  display: inline-flex;
  align-items: center;
  font-size: 19px;
  font-weight: 800;
  color: #fff;
  white-space: nowrap;
  letter-spacing: 0.3px;
}

.brand__logo .brand__dot {
  color: var(--color-accent);
  margin-left: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-links a {
  display: inline-flex;
  align-items: center;
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
}

.nav-links a:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-links a.active {
  color: #fff;
  background: rgba(244, 63, 94, 0.18);
  box-shadow: inset 0 0 0 1px rgba(244, 63, 94, 0.25);
}

.command-search {
  display: flex;
  align-items: center;
  gap: 8px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-full);
  padding: 7px 14px;
  width: 250px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.command-search:focus-within {
  border-color: rgba(244, 63, 94, 0.5);
  box-shadow: 0 0 0 3px rgba(244, 63, 94, 0.12);
}

.command-search i {
  color: rgba(255, 255, 255, 0.45);
  font-size: 14px;
}

.command-search input {
  background: transparent;
  border: none;
  outline: none;
  color: #fff;
  font-size: 14px;
  width: 100%;
}

.command-search input::placeholder {
  color: rgba(255, 255, 255, 0.35);
}

.command-search kbd {
  font-size: 11px;
  color: rgba(255, 255, 255, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  padding: 2px 6px;
  background: rgba(255, 255, 255, 0.04);
  white-space: nowrap;
}

.nav-cta {
  display: inline-flex;
  align-items: center;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 22px;
  padding: 6px;
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.nav-toggle:hover {
  color: var(--color-accent);
}

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 120px 0 100px;
  background: url('/assets/images/backpic/back-1.png') center / cover no-repeat;
  background-color: var(--color-surface-dark);
  color: #fff;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(15, 23, 42, 0.94) 0%, rgba(15, 23, 42, 0.78) 50%, rgba(15, 23, 42, 0.55) 100%);
}

.hero::after {
  content: '';
  position: absolute;
  right: -120px;
  top: -120px;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(244, 63, 94, 0.18) 0%, transparent 70%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 2;
  max-width: 760px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(244, 63, 94, 0.15);
  border: 1px solid rgba(244, 63, 94, 0.3);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13px;
  font-weight: 600;
  color: #fda4af;
  margin-bottom: 24px;
}

.hero__badge i {
  font-size: 12px;
}

.hero__title {
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -1px;
  margin-bottom: 20px;
  text-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.hero__title .hero-title-accent {
  color: var(--color-accent);
  position: relative;
}

.hero__desc {
  font-size: 17px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  max-width: 600px;
  margin-bottom: 36px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 48px;
}

.hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.hero-stat__number {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.2;
  color: #fff;
}

.hero-stat__number span {
  color: var(--color-accent);
}

.hero-stat__label {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.58);
  margin-top: 4px;
}

/* ===== About Section ===== */
.about-section {
  padding: var(--spacing-section) 0;
  background: var(--color-surface);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-media::after {
  content: '';
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  pointer-events: none;
}

.about-media img {
  width: 100%;
  height: 520px;
  object-fit: cover;
}

.about-media__tag {
  position: absolute;
  left: 20px;
  bottom: 20px;
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(8px);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.14);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.about-media__tag i {
  color: var(--color-accent);
}

.about-content .section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1px;
  background: var(--color-accent-soft);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
}

.about-content h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.about-content > p {
  color: var(--color-text-light);
  font-size: 15px;
  line-height: 1.8;
  margin-bottom: 28px;
}

.about-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-bg);
  transition: box-shadow 0.2s ease, transform 0.2s ease;
}

.about-item:hover {
  box-shadow: var(--shadow-sm);
  transform: translateX(4px);
}

.about-item__icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 18px;
}

.about-item h3 {
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.about-item p {
  font-size: 14px;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ===== Features Section ===== */
.features-section {
  padding: var(--spacing-section) 0;
  background: var(--color-bg);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 30px 28px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(244, 63, 94, 0.25);
}

.feature-card__num {
  position: absolute;
  top: 20px;
  right: 22px;
  font-size: 34px;
  font-weight: 900;
  color: rgba(15, 23, 42, 0.04);
  line-height: 1;
  letter-spacing: -1px;
}

.feature-card__icon {
  width: 54px;
  height: 54px;
  border-radius: 14px;
  background: var(--color-accent-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-accent);
  font-size: 22px;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--color-text-light);
}

/* ===== Data Panel Section ===== */
.data-section {
  padding: var(--spacing-section) 0;
  background: var(--color-surface-dark);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.data-section::before {
  content: '';
  position: absolute;
  left: -100px;
  bottom: -100px;
  width: 300px;
  height: 300px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(244, 63, 94, 0.12) 0%, transparent 70%);
}

.data-section .section-title {
  color: #fff;
}

.data-section .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

.data-panel {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
  position: relative;
  z-index: 1;
}

.data-item {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.09);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  text-align: center;
  transition: background 0.3s ease, border-color 0.3s ease;
}

.data-item:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(244, 63, 94, 0.35);
}

.data-item__num {
  font-size: 40px;
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 8px;
}

.data-item__num span {
  color: var(--color-accent);
}

.data-item__label {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
}

/* ===== News Section ===== */
.news-section {
  padding: var(--spacing-section) 0;
  background: var(--color-surface);
}

.news-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.news-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.news-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.news-card__media {
  position: relative;
  height: 180px;
  overflow: hidden;
}

.news-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.news-card:hover .news-card__media img {
  transform: scale(1.06);
}

.news-card__badge {
  position: absolute;
  left: 12px;
  top: 12px;
  background: rgba(15, 23, 42, 0.88);
  backdrop-filter: blur(6px);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.news-card__body {
  padding: 18px 20px 20px;
}

.news-card__title {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--color-primary);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.news-card__title a:hover {
  color: var(--color-accent);
}

.news-card__excerpt {
  font-size: 13px;
  line-height: 1.65;
  color: var(--color-text-light);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 14px;
}

.news-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.news-card__date {
  font-size: 12px;
  color: var(--color-text-muted);
}

.news-card__more {
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
}

.news-card__more:hover {
  color: var(--color-accent-hover);
}

.empty-state {
  background: var(--color-bg);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 64px 24px;
  text-align: center;
  grid-column: 1 / -1;
}

.empty-state i {
  font-size: 40px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
}

.empty-state p {
  font-size: 15px;
  color: var(--color-text-light);
}

/* ===== Category Section ===== */
.category-section {
  padding: var(--spacing-section) 0;
  background: var(--color-bg);
}

.category-card {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.category-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.category-card__media {
  min-height: 320px;
}

.category-card__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.category-card__body {
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.category-card__tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-size: 13px;
  font-weight: 700;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  margin-bottom: 16px;
  width: fit-content;
}

.category-card__body h3 {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.category-card__body p {
  font-size: 15px;
  color: var(--color-text-light);
  line-height: 1.75;
  margin-bottom: 24px;
}

.category-card__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  font-weight: 700;
  font-size: 15px;
  transition: gap 0.2s ease;
}

.category-card__link:hover {
  gap: 12px;
}

/* ===== Process Section ===== */
.process-section {
  padding: var(--spacing-section) 0;
  background: url('/assets/images/backpic/back-2.png') center / cover no-repeat;
  position: relative;
  color: #fff;
}

.process-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(10, 15, 26, 0.94) 0%, rgba(15, 23, 42, 0.88) 100%);
}

.process-section .container {
  position: relative;
  z-index: 1;
}

.process-section .section-title {
  color: #fff;
}

.process-section .section-subtitle {
  color: rgba(255, 255, 255, 0.6);
}

.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-md);
  padding: 32px 24px;
  position: relative;
  transition: background 0.3s ease, border-color 0.3s ease, transform 0.3s ease;
}

.step-item:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(244, 63, 94, 0.35);
  transform: translateY(-4px);
}

.step-item__num {
  font-size: 13px;
  font-weight: 800;
  color: var(--color-accent);
  letter-spacing: 1px;
  margin-bottom: 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.step-item__num::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

.step-item__icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  background: rgba(244, 63, 94, 0.14);
  border: 1px solid rgba(244, 63, 94, 0.2);
  color: #fda4af;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  margin-bottom: 20px;
}

.step-item h3 {
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 8px;
}

.step-item p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.58);
  line-height: 1.65;
}

/* ===== FAQ Section ===== */
.faq-section {
  padding: var(--spacing-section) 0;
  background: var(--color-surface);
}

.faq-list {
  max-width: 840px;
  margin: 0 auto;
}

.faq-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: 16px;
  overflow: hidden;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.faq-item:hover {
  box-shadow: var(--shadow-sm);
}

.faq-item[open] {
  border-color: rgba(244, 63, 94, 0.3);
  box-shadow: var(--shadow-sm);
}

.faq-item details summary {
  list-style: none;
  cursor: pointer;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px;
  font-size: 15px;
  font-weight: 600;
  color: var(--color-primary);
  transition: color 0.2s ease;
  user-select: none;
}

.faq-item summary i {
  flex-shrink: 0;
  margin-left: 16px;
  color: var(--color-accent);
  transition: transform 0.25s ease;
}

.faq-item[open] summary i {
  transform: rotate(45deg);
}

.faq-item summary:hover {
  color: var(--color-accent);
}

.faq-answer {
  padding: 0 24px 20px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--color-text-light);
}

/* ===== CTA Section ===== */
.cta-section {
  padding: var(--spacing-section) 0;
  background: url('/assets/images/backpic/back-3.png') center / cover no-repeat;
  position: relative;
}

.cta-section::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(244, 63, 94, 0.88) 0%, rgba(244, 63, 94, 0.65) 100%);
}

.cta-box {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
  color: #fff;
}

.cta-box h2 {
  font-size: clamp(26px, 3.4vw, 38px);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.cta-box p {
  font-size: 16px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.85);
  margin-bottom: 32px;
}

.cta-box__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
}

.cta-box .btn--light {
  background: #fff;
  color: var(--color-accent);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.12);
}

.cta-box .btn--light:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.18);
}

.cta-box .btn--ghost {
  border-color: rgba(255, 255, 255, 0.6);
}

.cta-box .btn--ghost:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* ===== Footer ===== */
.site-footer {
  background: #0d1420;
  color: rgba(255, 255, 255, 0.7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 40px;
  padding: 64px 0 40px;
}

.footer-brand .footer-logo {
  display: inline-flex;
  align-items: center;
  font-size: 19px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: 0.3px;
}

.footer-brand .footer-logo .brand__dot {
  color: var(--color-accent);
}

.footer-brand p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.5);
  max-width: 300px;
  margin-bottom: 20px;
}

.footer-social {
  display: flex;
  gap: 12px;
}

.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 10px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: 15px;
  transition: all 0.2s ease;
}

.footer-social a:hover {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #fff;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  transition: color 0.2s ease;
}

.footer-col ul a:hover {
  color: var(--color-accent);
}

.footer-contact p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 10px;
}

.footer-contact p i {
  width: 20px;
  color: var(--color-accent);
  margin-right: 4px;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 20px 0;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.35);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root {
    --spacing-section: 72px;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .news-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .data-panel {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .about-media img {
    height: 400px;
  }

  .category-card {
    grid-template-columns: 1fr;
  }

  .category-card__media {
    min-height: 240px;
  }

  .category-card__body {
    padding: 36px 32px;
  }

  .command-search {
    width: 200px;
  }
}

@media (max-width: 900px) {
  body {
    padding-top: 60px;
  }

  .navbar {
    height: 60px;
    gap: 12px;
  }

  .nav-toggle {
    display: block;
  }

  .nav-links,
  .command-search {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    background: rgba(10, 15, 26, 0.97);
    backdrop-filter: blur(20px);
    padding: 16px 24px 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
  }

  .site-header.nav-open .nav-links,
  .site-header.nav-open .command-search {
    display: flex;
  }

  .nav-links {
    gap: 4px;
  }

  .nav-links a {
    padding: 12px 16px;
    font-size: 15px;
    border-radius: 10px;
  }

  .command-search {
    width: 100%;
    margin-top: 12px;
  }

  .nav-cta {
    display: none;
  }

  .hero {
    padding: 90px 0 70px;
  }

  .hero__stats {
    gap: 28px;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 20px;
  }

  .feature-card {
    padding: 24px 20px;
  }

  .about-media img {
    height: 340px;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }

  .data-panel {
    gap: 16px;
  }

  .data-item {
    padding: 24px 16px;
  }

  .data-item__num {
    font-size: 30px;
  }
}

@media (max-width: 520px) {
  :root {
    --spacing-section: 56px;
  }

  .hero {
    padding: 70px 0 54px;
  }

  .hero__title {
    font-size: 30px;
  }

  .hero__desc {
    font-size: 15px;
  }

  .hero__actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .hero__stats {
    flex-direction: column;
    gap: 20px;
    padding-top: 24px;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .news-grid {
    grid-template-columns: 1fr;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .data-panel {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }

  .category-card__body {
    padding: 28px 24px;
  }

  .btn {
    width: 100%;
  }

  .section-header {
    margin-bottom: 36px;
  }
}

/* roulang page: category1 */
:root{
  --primary:#e63946;
  --primary-dark:#b71c2c;
  --primary-light:#ff5d6c;
  --dark:#0b1420;
  --dark-2:#101d2d;
  --ink:#1a2733;
  --text:#3c4858;
  --muted:#8a99a8;
  --line:#e3eaf0;
  --bg:#f4f7fa;
  --white:#ffffff;
  --radius-lg:18px;
  --radius-md:12px;
  --radius-sm:8px;
  --shadow-sm:0 2px 8px rgba(15,30,45,.06);
  --shadow-md:0 10px 28px rgba(15,30,45,.10);
  --shadow-lg:0 20px 48px rgba(15,30,45,.14);
  --space-section:96px;
  --font-sans:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC",sans-serif;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-sans);background:var(--bg);color:var(--text);line-height:1.75;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;height:auto;display:block}
a{color:inherit;text-decoration:none;transition:color .2s ease}
ul,ol{list-style:none}
button,input,select,textarea{font-family:inherit;font-size:inherit}
.container{max-width:1200px;margin:0 auto;padding:0 24px;width:100%}
.container-lg{max-width:1320px;margin:0 auto;padding:0 24px;width:100%}
.section{padding:var(--space-section) 0}
.section--tint{background:var(--bg)}
.section--dark{background:var(--dark);color:#cbd5e1}
.section-head{max-width:760px;margin-bottom:52px}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center}
.section-head .eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--primary);background:rgba(230,57,70,.08);border:1px solid rgba(230,57,70,.16);padding:6px 14px;border-radius:999px;margin-bottom:18px}
.section-head .eyebrow::before{content:"";width:6px;height:6px;border-radius:50%;background:var(--primary)}
.section-head h2{font-size:clamp(28px,4vw,40px);font-weight:800;color:var(--ink);line-height:1.2;letter-spacing:-.02em;margin-bottom:14px}
.section-head p{font-size:17px;color:var(--muted);line-height:1.8}
.section--dark .section-head h2{color:#f1f5f9}
.section--dark .section-head p{color:#94a3b8}
/* ===== header / nav ===== */
.site-header{background:rgba(11,20,32,.96);backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.06);position:sticky;top:0;z-index:1000;padding:0}
.site-header .navbar{max-width:1400px;margin:0 auto;padding:0 28px;display:flex;align-items:center;height:72px;gap:24px}
.brand__logo{display:flex;align-items:center;font-size:20px;font-weight:800;color:#fff;letter-spacing:-.01em;line-height:1.2;white-space:nowrap}
.brand__logo .brand__dot{color:var(--primary-light);margin-left:1px}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:12px}
.nav-links a{color:#a8b6c6;font-size:15px;font-weight:500;padding:10px 16px;border-radius:10px;transition:all .2s ease;position:relative}
.nav-links a:hover{color:#fff;background:rgba(255,255,255,.07)}
.nav-links a.active{color:#fff;background:rgba(230,57,70,.16)}
.nav-links a.active::after{content:"";position:absolute;bottom:2px;left:50%;transform:translateX(-50%);width:20px;height:3px;border-radius:3px;background:var(--primary)}
.command-search{flex:1;max-width:340px;margin-left:auto;display:flex;align-items:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.1);border-radius:999px;padding:8px 16px;gap:10px;transition:border-color .2s,box-shadow .2s}
.command-search:focus-within{border-color:rgba(230,57,70,.6);box-shadow:0 0 0 3px rgba(230,57,70,.18)}
.command-search i{color:#7e8ea0;font-size:14px}
.command-search input{background:transparent;border:none;outline:none;color:#e2e8f0;font-size:14px;width:100%}
.command-search input::placeholder{color:#66788c}
.command-search kbd{background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.12);color:#a8b6c6;font-size:11px;padding:2px 8px;border-radius:6px;font-family:inherit;white-space:nowrap}
.nav-cta{margin-left:6px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:12px 24px;border-radius:12px;font-weight:600;font-size:15px;line-height:1.4;border:none;cursor:pointer;transition:all .2s ease;text-decoration:none}
.btn--accent{background:var(--primary);color:#fff;box-shadow:0 6px 18px rgba(230,57,70,.28)}
.btn--accent:hover{background:var(--primary-light);transform:translateY(-2px)}
.btn--outline{background:transparent;color:#f1f5f9;border:1.5px solid rgba(255,255,255,.25)}
.btn--outline:hover{border-color:rgba(255,255,255,.7);color:#fff}
.btn--dark{background:var(--dark);color:#fff}
.btn--dark:hover{background:#0d1c2e}
.btn--ghost{background:transparent;color:var(--ink);border:1.5px solid var(--line)}
.btn--ghost:hover{border-color:var(--ink);background:rgba(18,28,40,.04)}
.nav-toggle{display:none;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);color:#fff;width:44px;height:44px;border-radius:10px;font-size:18px;cursor:pointer;align-items:center;justify-content:center;transition:background .2s}
.nav-toggle:hover{background:rgba(255,255,255,.16)}
/* ===== hero ===== */
.page-hero{background:linear-gradient(135deg,#0b1420 0%,#101d2d 60%,#182a3e 100%);position:relative;padding:72px 0 88px;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;opacity:.18;pointer-events:none}
.page-hero::after{content:"";position:absolute;right:-120px;top:-120px;width:360px;height:360px;background:radial-gradient(circle,rgba(230,57,70,.24),transparent 70%);pointer-events:none}
.page-hero .container{position:relative;z-index:2;display:flex;gap:48px;align-items:center;flex-wrap:wrap}
.page-hero__content{flex:1 1 560px}
.page-hero__content h1{font-size:clamp(34px,5.2vw,56px);font-weight:900;color:#fff;line-height:1.14;letter-spacing:-.02em;margin-bottom:22px}
.page-hero__content h1 .highlight{color:var(--primary-light);position:relative}
.page-hero__content p{font-size:18px;line-height:1.9;color:#a8b6c6;max-width:600px;margin-bottom:32px}
.hero-badges{display:flex;flex-wrap:wrap;gap:10px;margin-bottom:30px}
.hero-badge{display:inline-flex;align-items:center;gap:8px;background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.12);color:#dbe4ee;padding:7px 16px;border-radius:999px;font-size:13px;font-weight:500}
.hero-badge i{color:var(--primary-light)}
.page-hero__actions{display:flex;flex-wrap:wrap;gap:16px}
.page-hero__visual{flex:0 1 440px;position:relative;display:flex;justify-content:center}
.hero-card{background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);border-radius:20px;padding:28px;backdrop-filter:blur(12px);width:100%;max-width:360px}
.hero-card__top{display:flex;align-items:center;gap:12px;margin-bottom:18px}
.hero-card__top i{font-size:24px;color:var(--primary-light)}
.hero-card__top span{font-size:16px;font-weight:700;color:#f1f5f9}
.hero-card__status{display:flex;align-items:center;gap:8px;background:rgba(16,185,129,.12);color:#34d399;font-size:13px;font-weight:600;padding:5px 12px;border-radius:999px;margin-bottom:20px}
.hero-card__status i{width:8px;height:8px;border-radius:50%;background:#34d399;box-shadow:0 0 0 3px rgba(52,217,153,.2)}
.hero-card__row{display:flex;justify-content:space-between;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08);color:#b6c4d3;font-size:14px}
.hero-card__row strong{color:#fff;font-weight:600}
/* ===== breadcrumb ===== */
.breadcrumb{padding:24px 0 0}
.breadcrumb ul{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:14px;color:var(--muted)}
.breadcrumb ul li{display:flex;align-items:center;gap:8px}
.breadcrumb ul li:not(:last-child)::after{content:"/";color:#c2ccd6}
.breadcrumb ul li a{color:var(--ink);font-weight:500}
.breadcrumb ul li a:hover{color:var(--primary)}
.breadcrumb ul li.current{color:var(--primary);font-weight:600}
/* ===== quick links ===== */
.quick-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:28px}
.quick-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 20px;display:flex;align-items:center;gap:12px;transition:all .25s ease;box-shadow:var(--shadow-sm)}
.quick-card i{width:38px;height:38px;border-radius:10px;background:rgba(230,57,70,.1);color:var(--primary);display:inline-flex;align-items:center;justify-content:center;font-size:16px;flex-shrink:0}
.quick-card span{font-size:14px;font-weight:600;color:var(--ink);line-height:1.3}
.quick-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md);border-color:rgba(230,57,70,.3)}
/* ===== guide cards ===== */
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.guide-card{background:#fff;border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow-sm);transition:all .3s ease;display:flex;flex-direction:column}
.guide-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(230,57,70,.2)}
.guide-card__media{position:relative;aspect-ratio:16/9;overflow:hidden}
.guide-card__media img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}
.guide-card:hover .guide-card__media img{transform:scale(1.05)}
.guide-card__media::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 50%,rgba(11,20,32,.55))}
.guide-card__icon{position:absolute;left:16px;bottom:14px;z-index:2;width:42px;height:42px;border-radius:12px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:17px;box-shadow:0 6px 16px rgba(230,57,70,.35)}
.guide-card__body{padding:24px;flex:1;display:flex;flex-direction:column}
.guide-card__body h3{font-size:18px;font-weight:700;color:var(--ink);margin-bottom:10px;line-height:1.4}
.guide-card__body p{font-size:14px;color:var(--muted);line-height:1.8;flex:1;margin-bottom:16px}
.guide-card__meta{display:flex;align-items:center;gap:14px;padding-top:14px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.guide-card__meta span{display:inline-flex;align-items:center;gap:6px}
.guide-card__link{display:inline-flex;align-items:center;gap:6px;color:var(--primary);font-weight:600;font-size:14px;margin-top:12px}
.guide-card__link:hover{gap:10px}
/* ===== step section ===== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;counter-reset:step}
.step-card{background:#fff;border:1px solid var(--line);border-radius:var(--radius-lg);padding:32px 28px;position:relative;box-shadow:var(--shadow-sm);transition:all .25s ease}
.step-card::before{counter-increment:step;content:counter(step) ;position:absolute;top:-16px;left:28px;background:var(--primary);color:#fff;font-size:14px;font-weight:800;width:32px;height:32px;border-radius:10px;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 12px rgba(230,57,70,.3)}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-md)}
.step-card i{font-size:26px;color:var(--primary);margin-bottom:16px}
.step-card h3{font-size:17px;font-weight:700;color:var(--ink);margin-bottom:10px}
.step-card p{font-size:14px;color:var(--muted);line-height:1.8}
/* ===== version cards ===== */
.version-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}
.version-card{background:var(--dark);border-radius:var(--radius-lg);padding:30px;display:flex;gap:20px;align-items:flex-start;color:#e2e8f0;border:1px solid rgba(255,255,255,.08);transition:all .3s ease;position:relative;overflow:hidden}
.version-card::before{content:"";position:absolute;right:-40px;top:-40px;width:120px;height:120px;border-radius:50%;background:rgba(230,57,70,.15)}
.version-card:hover{transform:translateY(-4px);border-color:rgba(230,57,70,.4);box-shadow:0 16px 36px rgba(0,0,0,.25)}
.version-card i{font-size:32px;color:var(--primary-light);flex-shrink:0}
.version-card h3{font-size:19px;font-weight:700;color:#fff;margin-bottom:8px}
.version-card .version-tag{display:inline-block;background:rgba(230,57,70,.16);color:#ff8793;font-size:12px;font-weight:700;padding:3px 12px;border-radius:999px;margin-bottom:12px}
.version-card p{font-size:14px;color:#a8b6c6;line-height:1.8;margin-bottom:14px}
.version-card .btn{padding:9px 18px;font-size:13px}
/* ===== downloads ===== */
.download-banner{background:linear-gradient(120deg,#0b1420 0%,#16283a 100%);border-radius:22px;padding:48px;display:flex;align-items:center;justify-content:space-between;gap:40px;flex-wrap:wrap;position:relative;overflow:hidden}
.download-banner::after{content:"";position:absolute;right:-60px;bottom:-60px;width:220px;height:220px;border-radius:50%;background:rgba(230,57,70,.18)}
.download-banner__info{position:relative;z-index:3;flex:1 1 420px}
.download-banner__info h2{font-size:28px;color:#fff;font-weight:800;line-height:1.25;margin-bottom:14px}
.download-banner__info p{color:#94a3b8;font-size:16px;line-height:1.8;margin-bottom:24px}
.download-banner__list{display:flex;flex-wrap:wrap;gap:12px;margin-top:18px}
.download-banner__list li{display:inline-flex;align-items:center;gap:8px;color:#e2e8f0;font-size:14px;background:rgba(255,255,255,.06);border-radius:999px;padding:7px 16px}
.download-banner__list li i{color:#34d399}
.download-banner__actions{position:relative;z-index:3;display:flex;flex-direction:column;gap:12px;flex:0 1 280px;width:100%}
.download-banner__actions .btn{width:100%;padding:14px 28px}
/* ===== topics ===== */
.topic-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}
.topic-item{background:#fff;border:1px solid var(--line);border-radius:14px;padding:20px 22px;display:flex;gap:16px;transition:all .25s ease}
.topic-item:hover{border-color:rgba(230,57,70,.3);box-shadow:var(--shadow-md);transform:translateY(-2px)}
.topic-item i{font-size:18px;color:var(--primary);background:rgba(230,57,70,.08);width:42px;height:42px;border-radius:10px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.topic-item h3{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:4px}
.topic-item p{font-size:13px;color:var(--muted);line-height:1.7}
/* ===== faq ===== */
.faq-wrap{max-width:860px;margin:0 auto}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:14px;margin-bottom:14px;box-shadow:var(--shadow-sm);transition:box-shadow .2s}
.faq-item details>summary{cursor:pointer;padding:22px 26px;font-size:16px;font-weight:600;color:var(--ink);list-style:none;position:relative;display:flex;align-items:center;gap:14px}
.faq-item details>summary::-webkit-details-marker{display:none}
.faq-item details>summary::after{content:"\f078";font-family:"Font Awesome 6 Free";font-weight:900;font-size:14px;color:var(--muted);margin-left:auto;transition:transform .3s}
.faq-item details[open]>summary::after{transform:rotate(180deg);color:var(--primary)}
.faq-item details>summary:hover{color:var(--primary)}
.faq-item details .faq-answer{padding:0 26px 22px;font-size:15px;color:var(--muted);line-height:1.85}
.faq-item details .faq-answer p{margin-bottom:12px}
/* ===== cta ===== */
.cta-section{background:linear-gradient(135deg,#0b1420,#151f2e 60%,#1c2c3f);border-radius:24px;padding:56px;text-align:center;position:relative;overflow:hidden}
.cta-section::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:linear-gradient(90deg,var(--primary),var(--primary-light),#f59e0b,var(--primary))}
.cta-section h2{font-size:34px;font-weight:900;color:#fff;line-height:1.2;margin-bottom:18px;position:relative;z-index:2}
.cta-section p{font-size:17px;color:#94a3b8;max-width:560px;margin:0 auto 32px;position:relative;z-index:2}
.cta-section .btn{position:relative;z-index:2}
/* ===== footer ===== */
.site-footer{background:var(--dark);color:#94a3b8;padding:70px 0 0;font-size:14px}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr 1.4fr;gap:44px;padding-bottom:50px;border-bottom:1px solid rgba(255,255,255,.07)}
.footer-brand .footer-logo{font-size:21px;font-weight:800;color:#fff;margin-bottom:16px;letter-spacing:-.01em}
.footer-brand p{line-height:1.9;color:#7e8ea0;margin-bottom:20px;max-width:320px}
.footer-social{display:flex;gap:10px}
.footer-social a{width:38px;height:38px;border-radius:10px;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.08);display:flex;align-items:center;justify-content:center;color:#b6c4d3;transition:all .2s}
.footer-social a:hover{background:var(--primary);color:#fff;border-color:var(--primary);transform:translateY(-2px)}
.footer-col h4{color:#f1f5f9;font-size:15px;font-weight:700;margin-bottom:18px}
.footer-col ul li{margin-bottom:12px}
.footer-col ul a{color:#7e8ea0;transition:color .2s}
.footer-col ul a:hover{color:var(--primary-light)}
.footer-contact p{display:flex;align-items:center;gap:10px;margin-bottom:12px;color:#7e8ea0}
.footer-contact p i{color:var(--primary-light);width:16px}
.footer-bottom{padding:22px 0;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#66788c;font-size:13px}
.footer-bottom a{color:#94a3b8}
/* ===== responsive ===== */
@media screen and (max-width:1024px){
  :root{--space-section:72px}
  .guide-grid{grid-template-columns:repeat(2,1fr)}
  .steps-grid{grid-template-columns:repeat(2,1fr)}
  .version-grid{grid-template-columns:1fr}
  .quick-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-links{display:none}
  .nav-toggle{display:flex}
  .navbar .command-search{display:none}
  .navbar{flex-wrap:wrap}
  .brand__logo{margin-right:auto}
  .page-hero__visual{flex:1 1 100%;margin-top:16px}
  .site-header .navbar{padding:0 18px;height:64px}
  .nav-cta{display:none}
}
@media screen and (max-width:768px){
  :root{--space-section:56px}
  .container,.container-lg{padding:0 18px}
  .section-head{margin-bottom:36px}
  .quick-grid{grid-template-columns:1fr 1fr}
  .guide-grid{grid-template-columns:1fr}
  .steps-grid{grid-template-columns:1fr}
  .topic-grid{grid-template-columns:1fr}
  .page-hero{padding:48px 0 64px}
  .page-hero__content h1{font-size:30px}
  .page-hero__actions .btn{flex:1}
  .download-banner{padding:32px 24px}
  .cta-section{padding:40px 24px}
  .cta-section h2{font-size:26px}
  .footer-grid{grid-template-columns:1fr;gap:32px}
  .footer-bottom{flex-direction:column;text-align:center}
  .hero-card{max-width:100%}
  .page-hero__actions{flex-direction:column;width:100%}
  .page-hero__actions .btn{width:100%}
}
@media screen and (max-width:520px){
  .quick-grid{grid-template-columns:1fr}
  .brand__logo{font-size:17px}
  .section-head h2{font-size:26px}
  .faq-item details>summary{font-size:15px;padding:18px 20px}
  .faq-item details .faq-answer{padding:0 20px 18px}
  .download-banner__list li{width:100%}
  .guide-card__body{padding:20px}
}

/* roulang page: article */
:root {
  --primary: #0b1f2e;
  --primary-light: #173247;
  --accent: #e63946;
  --accent-hover: #c1121f;
  --accent-soft: rgba(230, 57, 70, 0.08);
  --orange: #ff7a3d;
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1a2333;
  --muted: #66788a;
  --border: #e1e8ee;
  --radius: 14px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 10px rgba(11, 31, 46, 0.05);
  --shadow-md: 0 8px 24px rgba(11, 31, 46, 0.08);
  --shadow-lg: 0 18px 44px rgba(11, 31, 46, 0.12);
  --transition: 0.25s ease;
  --font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
ul, ol { list-style: none; }
button, input { font-family: inherit; }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.row { max-width: 1200px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 26px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  border: 2px solid transparent;
  transition: all var(--transition);
  cursor: pointer;
  line-height: 1.4;
  text-align: center;
}
.btn--accent {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 6px 18px rgba(230, 57, 70, 0.28);
}
.btn--accent:hover {
  background: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 10px 24px rgba(230, 57, 70, 0.34);
}
.btn--ghost {
  background: transparent;
  color: var(--primary);
  border-color: var(--border);
}
.btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}
.btn--block { display: flex; width: 100%; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 10px rgba(11, 31, 46, 0.04);
}
.navbar {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 24px;
  height: 68px;
  display: flex;
  align-items: center;
  gap: 28px;
}
.brand__logo {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.4px;
  color: var(--primary);
  white-space: nowrap;
  display: flex;
  align-items: center;
}
.brand__dot { color: var(--accent); margin-left: 1px; }
.nav-links { display: flex; gap: 24px; align-items: center; }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  padding: 8px 2px;
  position: relative;
  transition: color var(--transition);
  white-space: nowrap;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  transition: width 0.25s ease;
}
.nav-links a:hover,
.nav-links a.active { color: var(--primary); }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }
.command-search {
  flex: 1;
  max-width: 280px;
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 8px 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.command-search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(230, 57, 70, 0.12);
}
.command-search i { color: var(--muted); font-size: 14px; }
.command-search input {
  border: none;
  outline: none;
  background: transparent;
  flex: 1;
  font-size: 14px;
  color: var(--text);
}
.command-search input::placeholder { color: #9aa8b4; }
.command-search kbd {
  font-size: 11px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 2px 6px;
  color: var(--muted);
  white-space: nowrap;
}
.nav-cta { flex-shrink: 0; }
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 18px;
  color: var(--primary);
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  transition: all var(--transition);
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* ---------- Article Hero ---------- */
.article-hero {
  min-height: 340px;
  display: flex;
  align-items: flex-end;
  padding: 80px 0 48px;
  position: relative;
  background:
    linear-gradient(120deg, rgba(11, 31, 46, 0.94) 0%, rgba(11, 31, 46, 0.78) 55%, rgba(230, 57, 70, 0.35) 100%),
    url('/assets/images/backpic/back-1.png') center / cover no-repeat;
}
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.65);
  margin-bottom: 18px;
}
.breadcrumb a {
  color: rgba(255, 255, 255, 0.85);
  transition: color var(--transition);
}
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { opacity: 0.45; }
.breadcrumb .current {
  color: rgba(255, 255, 255, 0.7);
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.article-hero h1 {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height: 1.25;
  color: #fff;
  max-width: 900px;
  margin-bottom: 16px;
  text-shadow: 0 2px 20px rgba(0, 0, 0, 0.25);
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  color: rgba(255, 255, 255, 0.75);
  font-size: 14px;
}
.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.article-meta .badge {
  display: inline-flex;
  background: var(--accent);
  color: #fff;
  border-radius: 6px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.4px;
}

/* ---------- Article Body ---------- */
.article-body { padding: 56px 0 20px; }
.article-main .columns { padding-left: 15px; padding-right: 15px; }
.article-card {
  background: var(--surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: 32px;
}
.article-cover {
  aspect-ratio: 16 / 6.5;
  overflow: hidden;
  background: var(--primary);
}
.article-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.article-summary {
  padding: 24px 32px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(230, 57, 70, 0.04), rgba(255, 122, 61, 0.03));
}
.article-summary h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.article-summary h3::before {
  content: '';
  width: 4px;
  height: 18px;
  background: var(--accent);
  border-radius: 2px;
}
.article-summary p {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.8;
}
.article-content {
  padding: 32px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
}
.article-content h2 {
  font-size: 26px;
  font-weight: 800;
  margin: 36px 0 18px;
  padding-left: 14px;
  border-left: 4px solid var(--accent);
  line-height: 1.3;
}
.article-content h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 30px 0 14px;
  line-height: 1.4;
}
.article-content p { margin-bottom: 18px; }
.article-content ul,
.article-content ol {
  margin: 0 0 18px 22px;
}
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li { margin-bottom: 8px; }
.article-content blockquote {
  border-left: 4px solid var(--accent);
  background: var(--accent-soft);
  padding: 18px 22px;
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 26px 0;
  color: #334155;
  font-size: 15px;
}
.article-content img { border-radius: var(--radius); }
.article-content a {
  color: var(--accent);
  word-break: break-all;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition);
}
.article-content a:hover { border-color: var(--accent); }

.not-found {
  text-align: center;
  padding: 80px 32px;
}
.not-found i {
  font-size: 48px;
  color: var(--accent);
  margin-bottom: 20px;
}
.not-found h2 {
  font-size: 28px;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 12px;
}
.not-found p {
  color: var(--muted);
  font-size: 16px;
  margin-bottom: 28px;
}
.not-found-actions {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Sidebar ---------- */
.article-side .columns { padding-left: 15px; padding-right: 15px; }
.side-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 24px;
  margin-bottom: 24px;
  transition: box-shadow var(--transition);
}
.side-card:hover { box-shadow: var(--shadow-md); }
.side-card h3 {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
}
.side-card h3 i { color: var(--accent); }
.side-list li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px dashed var(--border);
  font-size: 14px;
}
.side-list li:last-child { border-bottom: none; }
.side-list .status-ok {
  color: #16a34a;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.side-list .status-ok::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.15);
}
.side-links li { margin-bottom: 6px; }
.side-links a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
}
.side-links a i {
  color: var(--accent);
  font-size: 12px;
  transition: transform var(--transition);
}
.side-links a:hover {
  background: var(--accent-soft);
  color: var(--accent);
}
.side-links a:hover i { transform: translateX(4px); }
.side-contact p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 16px;
}

/* ---------- Related Section ---------- */
.related-section { padding: 56px 0 24px; }
.section-head { margin-bottom: 36px; }
.section-tag {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 1.2px;
  margin-bottom: 10px;
  padding: 5px 12px;
  background: var(--accent-soft);
  border-radius: 6px;
}
.section-head h2 {
  font-size: 32px;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.3;
}
.related-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  height: 100%;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition);
  margin-bottom: 24px;
}
.related-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.related-img {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  position: relative;
}
.related-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}
.related-card:hover .related-img img { transform: scale(1.06); }
.related-body { padding: 22px 22px 24px; display: flex; flex-direction: column; flex: 1; }
.related-body .tag {
  display: inline-flex;
  align-self: flex-start;
  font-size: 12px;
  font-weight: 700;
  color: var(--orange);
  background: rgba(255, 122, 61, 0.1);
  padding: 4px 10px;
  border-radius: 6px;
  margin-bottom: 12px;
}
.related-body h3 {
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--primary);
  margin-bottom: 10px;
}
.related-body p {
  font-size: 14px;
  color: var(--muted);
  line-height: 1.75;
  margin-top: auto;
}

/* ---------- FAQ Section ---------- */
.faq-section {
  padding: 56px 0;
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin-bottom: 14px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.faq-item:hover {
  border-color: rgba(230, 57, 70, 0.3);
  box-shadow: var(--shadow-sm);
}
.faq-item summary {
  font-size: 16px;
  font-weight: 600;
  color: var(--primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  line-height: 1.5;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '\f078';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: 13px;
  color: var(--accent);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.faq-item[open] summary::after { transform: rotate(180deg); }
.faq-item p {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- CTA Section ---------- */
.cta-section { padding: 64px 0; }
.cta-box {
  background: linear-gradient(130deg, var(--primary) 0%, var(--primary-light) 60%, #1d3e57 100%);
  border-radius: var(--radius-lg);
  padding: 52px 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.cta-box::before {
  content: '';
  position: absolute;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(230, 57, 70, 0.35), transparent 70%);
  right: -80px;
  top: -140px;
  pointer-events: none;
}
.cta-box::after {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(255, 122, 61, 0.2), transparent 70%);
  left: 40%;
  bottom: -100px;
  pointer-events: none;
}
.cta-content { position: relative; z-index: 2; }
.cta-content h2 {
  font-size: 30px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 10px;
  line-height: 1.3;
}
.cta-content p {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.72);
  max-width: 520px;
  line-height: 1.7;
}
.cta-box .btn { position: relative; z-index: 2; flex-shrink: 0; }

/* ---------- Footer ---------- */
.site-footer {
  background: #08141e;
  color: rgba(255, 255, 255, 0.7);
  padding: 64px 0 0;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand .footer-logo {
  font-size: 22px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 16px;
}
.footer-brand p {
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.55);
  max-width: 330px;
}
.footer-social {
  display: flex;
  gap: 10px;
  margin-top: 22px;
}
.footer-social a {
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  color: rgba(255, 255, 255, 0.7);
  font-size: 15px;
  transition: all var(--transition);
}
.footer-social a:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-3px);
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 700;
  color: #fff;
  margin-bottom: 18px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
  transition: color var(--transition);
  position: relative;
  padding-left: 0;
}
.footer-col ul a:hover { color: #fff; padding-left: 4px; }
.footer-contact p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.55);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.footer-contact p i { color: var(--accent); width: 16px; }
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 22px 0;
  text-align: center;
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
}
.footer-bottom p { margin-bottom: 4px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .navbar { gap: 16px; padding: 0 20px; }
  .nav-links { gap: 16px; }
  .command-search { max-width: 200px; }
  .cta-box { padding: 44px 36px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 36px; }
}

@media (max-width: 768px) {
  .navbar { height: auto; min-height: 62px; flex-wrap: wrap; padding: 12px 18px; gap: 12px; }
  .brand__logo { font-size: 17px; }
  .nav-links {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    padding: 10px 0 4px;
    order: 10;
  }
  .nav-links.open { display: flex; }
  .nav-links a {
    width: 100%;
    padding: 10px 0;
    font-size: 15px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links a:last-child { border-bottom: none; }
  .nav-links a::after { display: none; }
  .command-search { display: none; }
  .nav-cta { display: none; }
  .nav-toggle { display: inline-flex; margin-left: auto; }
  .article-hero { min-height: 300px; padding: 60px 0 36px; }
  .article-hero h1 { font-size: 26px; }
  .article-content { padding: 24px 20px; }
  .article-summary { padding: 20px; }
  .cta-box { flex-direction: column; text-align: center; padding: 36px 24px; }
  .cta-content h2 { font-size: 24px; }
  .related-section { padding: 44px 0 16px; }
  .faq-section { padding: 44px 0; }
  .section-head h2 { font-size: 26px; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom { text-align: center; }
}

@media (max-width: 520px) {
  .navbar { padding: 10px 14px; }
  .article-hero h1 { font-size: 23px; }
  .article-meta { gap: 12px; font-size: 13px; }
  .side-card { padding: 18px; }
  .cta-box { padding: 30px 18px; }
  .not-found { padding: 60px 20px; }
  .not-found-actions { flex-direction: column; align-items: center; }
  .not-found-actions .btn { width: 100%; max-width: 280px; }
}