/* =========================================
   18新利平台中国官网 - 共享样式
   品牌调性：深蓝竞技 × 橙色高亮
   ========================================= */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Noto Sans SC', 'Roboto', system-ui, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: #333333;
  background: #F5F7FA;
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
  text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

button {
  cursor: pointer;
}

ul,
ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

h1, h2, h3, h4 {
  font-family: 'Arial Black', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  line-height: 1.15;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4rem);
}

h2 {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
}

h3 {
  font-size: clamp(1.3rem, 2.5vw, 1.8rem);
}

p {
  margin: 0 0 12px;
}

a {
  color: #FF6B35;
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: #E0552A;
}

::selection {
  background: #FF6B35;
  color: #FFFFFF;
}

figure {
  margin: 24px 0;
}

figcaption {
  font-size: 0.85rem;
  color: #B0B7C3;
  text-align: center;
  padding: 8px 16px;
}

blockquote {
  margin: 24px 0;
  padding: 16px 24px;
  border-left: 4px solid #FF6B35;
  background: #F5F7FA;
  border-radius: 0 16px 16px 0;
  font-size: 1.05rem;
  font-style: italic;
}

code {
  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;
  font-size: 0.9em;
  background: #E8EBF0;
  padding: 2px 6px;
  border-radius: 4px;
}

:root {
  --color-primary: #0A1F44;
  --color-primary-dark: #0D2A5B;
  --color-primary-deeper: #1A2A4A;
  --color-accent: #FF6B35;
  --color-accent-hover: #E0552A;
  --color-light: #F5F7FA;
  --color-light-alt: #E8EBF0;
  --color-white: #FFFFFF;
  --color-muted: #B0B7C3;
  --color-text: #333333;

  --font-headline: 'Arial Black', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Noto Sans SC', 'Roboto', system-ui, sans-serif;

  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --radius-pill: 999px;

  --container-width: 1320px;
  --header-height: 72px;
  --header-offset: 12px;
  --transition-fast: 0.2s ease;
  --transition-std: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 8px 24px rgba(10, 31, 68, 0.08);
  --shadow-pop: 0 12px 32px rgba(10, 31, 68, 0.16);
}

/* ---------- Focus ---------- */
:focus-visible {
  outline: 3px solid #FF6B35;
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- Layout Utilities ---------- */
.container {
  width: min(100% - 40px, 1320px);
  margin-inline: auto;
}

.content-narrow {
  max-width: 720px;
  margin-inline: auto;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 1024px) {
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3 {
    grid-template-columns: 1fr;
  }
}

/* ---------- Section / Numbered Chapter ---------- */
.section {
  padding: 72px 0;
  position: relative;
}

.section__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.section__index {
  font-family: var(--font-headline);
  font-size: clamp(2rem, 4vw, 3rem);
  color: var(--color-accent);
  line-height: 1;
  transform: rotate(-6deg);
  flex-shrink: 0;
}

.section__title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  color: var(--color-primary);
  margin: 0;
}

.section__note {
  writing-mode: vertical-rl;
  font-size: 0.78rem;
  color: var(--color-muted);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  margin-left: 8px;
}

@media (max-width: 640px) {
  .section__note {
    display: none;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: 999px;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.4;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn:active {
  transform: translateY(0) scale(0.98);
}

.btn--primary {
  background: var(--color-accent);
  color: #FFFFFF;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: #FFFFFF;
  box-shadow: 0 8px 24px rgba(255, 107, 53, 0.45);
}

.btn--ghost {
  background: transparent;
  color: var(--color-primary);
  border: 2px solid rgba(10, 31, 68, 0.6);
}

.btn--ghost:hover {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

.btn--ghost-light {
  background: transparent;
  color: var(--color-light);
  border: 2px solid rgba(245, 247, 250, 0.55);
}

.btn--ghost-light:hover {
  background: var(--color-light);
  border-color: var(--color-light);
  color: var(--color-primary);
}

/* ---------- Card ---------- */
.card {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: 28px;
  border: 1px solid var(--color-light-alt);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.card__title {
  font-size: 1.2rem;
  color: var(--color-primary);
}

.card__body {
  font-size: 0.95rem;
  color: #555;
  line-height: 1.65;
}

/* ---------- Data Chip ---------- */
.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 14px;
  background: var(--color-light-alt);
  border-radius: 999px;
  font-family: var(--font-headline);
  font-size: 0.82rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.data-chip--accent {
  background: var(--color-accent);
  color: #FFFFFF;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  color: var(--color-muted);
  margin: 0 0 24px;
}

.breadcrumb__link {
  color: var(--color-muted);
  text-decoration: none;
}

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

.breadcrumb__current {
  color: var(--color-text);
  font-weight: 600;
}

.breadcrumb__sep {
  opacity: 0.5;
}

.breadcrumb--inverse {
  color: rgba(255, 255, 255, 0.5);
}

.breadcrumb--inverse .breadcrumb__link,
.breadcrumb--inverse .breadcrumb__current {
  color: rgba(255, 255, 255, 0.65);
}

.breadcrumb--inverse .breadcrumb__link:hover {
  color: var(--color-accent);
}

/* ---------- Page Hero ---------- */
.page-hero {
  background: linear-gradient(140deg, var(--color-primary) 0%, var(--color-primary-dark) 55%, var(--color-primary-deeper) 100%);
  color: #FFFFFF;
  padding-top: calc(var(--header-height) + var(--header-offset) + 48px);
  padding-bottom: 64px;
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -40px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255, 107, 53, 0.2) 0%, transparent 70%);
  pointer-events: none;
}

.page-hero::after {
  content: attr(data-index);
  position: absolute;
  right: 24px;
  bottom: -28px;
  font-family: var(--font-headline);
  font-size: clamp(100px, 12vw, 200px);
  line-height: 1;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
  letter-spacing: -0.02em;
  user-select: none;
}

.page-hero__inner {
  width: min(100% - 40px, 1320px);
  margin-inline: auto;
  position: relative;
  z-index: 1;
}

.page-hero__title {
  font-size: clamp(1.8rem, 5vw, 3.2rem);
  color: #FFFFFF;
  max-width: 14em;
  margin: 16px 0 8px;
}

.page-hero__lead {
  color: rgba(255, 255, 255, 0.72);
  max-width: 42em;
  font-size: 1.05rem;
}

/* ---------- Poster / Image Container ---------- */
.poster {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, var(--color-light-alt) 0%, var(--color-light) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
}

.poster::before {
  content: "IMG";
  font-family: var(--font-headline);
  font-size: 1.1rem;
  color: var(--color-muted);
  letter-spacing: 0.25em;
  opacity: 0.7;
}

.poster--hero {
  aspect-ratio: 16 / 6;
  border-radius: var(--radius-lg);
}

.poster--card {
  aspect-ratio: 16 / 10;
  border-radius: var(--radius-md);
}

.poster--thumb {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  min-height: 0;
}

.poster--thumb::before {
  font-size: 0.7rem;
}

.poster__media {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.poster__caption {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 40px 16px 12px;
  background: linear-gradient(transparent, rgba(10, 31, 68, 0.65));
  color: #FFFFFF;
  font-size: 0.82rem;
  font-weight: 500;
}

/* ---------- Skip Link ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 700;
  background: var(--color-accent);
  color: #FFFFFF;
  padding: 10px 20px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(255, 107, 53, 0.4);
  transform: translateY(-200%);
  transition: transform 0.25s ease;
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- Scroll Progress ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent) 0%, #FF9A5C 100%);
  border-radius: 0 2px 2px 0;
  z-index: 600;
  pointer-events: none;
  will-change: width;
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  top: var(--header-offset);
  left: 50%;
  transform: translateX(-50%);
  width: min(calc(100% - 32px), var(--container-width));
  height: var(--header-height);
  z-index: 500;
  background: rgba(10, 31, 68, 0.82);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-pill);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.12);
  transition: background 0.3s ease, box-shadow 0.3s ease;
}

.site-header[data-scrolled] {
  background: rgba(10, 31, 68, 0.96);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.22);
}

.site-header__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 0 14px 0 12px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand__badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: var(--color-accent);
  color: #FFFFFF;
  font-family: var(--font-headline);
  font-size: 1.15rem;
  font-weight: 900;
  border-radius: 12px;
  transform: rotate(-6deg);
  box-shadow: 0 4px 12px rgba(255, 107, 53, 0.35);
  transition: transform 0.3s ease;
  user-select: none;
}

.brand:hover .brand__badge {
  transform: rotate(0deg);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand__text strong {
  font-family: var(--font-headline);
  font-size: 1.35rem;
  color: #FFFFFF;
  letter-spacing: 0.04em;
}

.brand__text small {
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  color: var(--color-muted);
  text-transform: uppercase;
  margin-top: 3px;
}

/* ---------- Navigation ---------- */
.nav-site__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.nav-site__link {
  display: inline-block;
  padding: 8px 14px;
  color: rgba(255, 255, 255, 0.82);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  border-radius: 999px;
  transition: background 0.25s ease, color 0.25s ease;
}

.nav-site__link:hover {
  color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
}

.nav-site__link[aria-current="page"] {
  color: var(--color-accent);
  background: rgba(255, 107, 53, 0.14);
  font-weight: 700;
}

/* ---------- Nav Toggle ---------- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 12px;
  cursor: pointer;
  padding: 0;
  flex-shrink: 0;
}

.nav-toggle__line {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-white);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary);
  color: rgba(255, 255, 255, 0.8);
  position: relative;
  overflow: hidden;
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-accent) 0%, rgba(255, 107, 53, 0.15) 100%);
  z-index: 1;
}

.site-footer::after {
  content: "18";
  position: absolute;
  right: -24px;
  bottom: -36px;
  font-family: var(--font-headline);
  font-size: 180px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.03);
  pointer-events: none;
  user-select: none;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1.2fr;
  gap: 48px;
  padding: 56px 0 40px;
  position: relative;
  z-index: 1;
}

.site-footer__brand .brand {
  margin-bottom: 16px;
}

.site-footer__statement {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.6);
  line-height: 1.75;
  margin: 0;
  max-width: 32em;
}

.site-footer__heading {
  font-family: var(--font-headline);
  font-size: 1.05rem;
  color: var(--color-white);
  margin-bottom: 16px;
  padding-left: 14px;
  position: relative;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-footer__heading::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 6px;
  height: 18px;
  background: var(--color-accent);
  border-radius: 999px;
}

.site-footer__nav {
  display: grid;
  gap: 6px;
}

.site-footer__nav a {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.92rem;
  text-decoration: none;
  transition: color 0.2s ease, padding-left 0.2s ease;
}

.site-footer__nav a:hover {
  color: var(--color-accent);
  padding-left: 4px;
}

.site-footer__meta {
  display: grid;
  gap: 8px;
}

.site-footer__meta li {
  font-size: 0.9rem;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.7;
}

.site-footer__meta-label {
  color: rgba(255, 255, 255, 0.95);
  font-weight: 600;
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding: 20px 0 24px;
  font-size: 0.82rem;
  color: rgba(255, 255, 255, 0.55);
  position: relative;
  z-index: 1;
}

.site-footer__copy {
  margin: 0;
}

.site-footer__icp {
  margin: 0;
}

.site-footer__legal {
  display: flex;
  align-items: center;
  gap: 10px;
}

.site-footer__legal a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color 0.2s ease;
}

.site-footer__legal a:hover {
  color: var(--color-accent);
}

.site-footer__sep {
  opacity: 0.4;
}

/* ---------- Reveal on Scroll ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal][data-visible] {
  opacity: 1;
  transform: translateY(0);
}

[data-stagger] > [data-reveal]:nth-child(1) {
  transition-delay: 0ms;
}

[data-stagger] > [data-reveal]:nth-child(2) {
  transition-delay: 80ms;
}

[data-stagger] > [data-reveal]:nth-child(3) {
  transition-delay: 160ms;
}

[data-stagger] > [data-reveal]:nth-child(4) {
  transition-delay: 240ms;
}

[data-stagger] > [data-reveal]:nth-child(5) {
  transition-delay: 320ms;
}

[data-stagger] > [data-reveal]:nth-child(6) {
  transition-delay: 400ms;
}

/* ---------- Responsive: Tablet & Mobile ---------- */
@media (max-width: 980px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .site-footer__brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav-site {
    position: absolute;
    top: calc(100% + 8px);
    left: 8px;
    right: 8px;
    background: rgba(10, 31, 68, 0.97);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 12px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s;
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
    max-height: calc(100vh - 120px);
    overflow-y: auto;
  }

  .nav-site[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-site__list {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
  }

  .nav-site__link {
    display: block;
    padding: 12px 18px;
    font-size: 1rem;
    border-radius: 12px;
  }
}

@media (max-width: 640px) {
  .site-header {
    width: calc(100% - 24px);
  }

  .brand__text small {
    font-size: 0.5rem;
  }

  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 44px 0 32px;
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
    padding-top: 16px;
  }

  .page-hero__inner {
    width: min(100% - 32px, 1320px);
  }
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .skip-link {
    transition: none;
  }
}