/* ============================================================
   云顶集团 · Site Kit
   设计母题：雪域目录 / Plateau Directory
   文件路径：/assets/site.css
   ============================================================ */

/* ---------- 01 · 设计变量 ---------- */
:root {
  --plateau-blue: #1B4D89;
  --snow-white: #F8FAFC;
  --warm-orange: #FF8C42;
  --deep-teal: #0F4C5C;
  --wine-red: #7A2E3D;
  --indigo: #3A2D78;
  --deep-gray: #2D3748;
  --fog-gray: #E2E8F0;
  --gold: #D4AF37;
  --sky-blue: #6BA4B8;

  --font-heading: Montserrat, 'Source Han Sans CN', 'Noto Sans CJK SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: Georgia, 'Source Han Serif CN', 'Noto Serif CJK SC', 'Songti SC', 'SimSun', serif;

  --container-max: 1200px;
  --container-pad: clamp(1.25rem, 4vw, 2.5rem);
  --header-top-height: 66px;
  --nav-height: 50px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.2s var(--ease-out);
  --transition-base: 0.4s var(--ease-out);
}

/* ---------- 02 · 基础重置 ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 120px;
  -webkit-text-size-adjust: 100%;
}

body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: var(--snow-white);
  color: var(--deep-gray);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

main#main-content {
  flex: 1;
  outline: none;
  scroll-margin-top: calc(var(--header-top-height) + var(--nav-height) + 1rem);
}

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  background: none;
  border: none;
  color: inherit;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  text-wrap: balance;
}

p {
  text-wrap: pretty;
}

::selection {
  background: var(--plateau-blue);
  color: var(--snow-white);
}

:focus-visible {
  outline: 3px solid var(--warm-orange);
  outline-offset: 2px;
}

/* ---------- 03 · 通用组件 ---------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

.section {
  padding-top: clamp(2.75rem, 7vw, 5.5rem);
  padding-bottom: clamp(2.75rem, 7vw, 5.5rem);
}

.section--cloud {
  background: linear-gradient(180deg, var(--fog-gray) 0%, var(--snow-white) 100%);
}

.section--jewel {
  background: var(--plateau-blue);
  color: rgba(248, 250, 252, 0.88);
}

.section--night {
  background: var(--indigo);
  color: rgba(248, 250, 252, 0.88);
}

.section--jewel .page-title,
.section--night .page-title {
  color: var(--snow-white);
}

.section--jewel .eyebrow,
.section--night .eyebrow {
  color: var(--gold);
}

.page-content {
  padding-top: clamp(2.5rem, 6vw, 4.5rem);
  padding-bottom: clamp(3rem, 8vw, 5.5rem);
}

.page-title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5.5vw, 3.5rem);
  font-weight: 900;
  line-height: 1.15;
  color: var(--plateau-blue);
  margin-bottom: 1.25rem;
}

.page-intro {
  font-size: 1.125rem;
  line-height: 1.8;
  color: var(--deep-gray);
  max-width: 42rem;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--plateau-blue);
  margin-bottom: 0.875rem;
}

.eyebrow::before {
  content: '';
  width: 2rem;
  height: 2px;
  background: var(--warm-orange);
  display: inline-block;
  flex-shrink: 0;
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.375rem;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  color: var(--deep-gray);
  margin-bottom: 1.5rem;
}

.breadcrumb a {
  color: var(--plateau-blue);
  font-weight: 600;
  text-decoration: underline;
  text-decoration-color: rgba(27, 77, 137, 0.3);
  text-underline-offset: 3px;
}

.breadcrumb a:hover {
  text-decoration-color: var(--warm-orange);
}

.breadcrumb__sep {
  color: var(--fog-gray);
  user-select: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 3rem;
  padding: 0.625rem 1.625rem;
  border: 2px solid transparent;
  border-radius: 999px;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: center;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(27, 77, 137, 0.18);
}

.btn--primary {
  background: var(--plateau-blue);
  color: var(--snow-white);
}

.btn--primary:hover {
  background: var(--deep-teal);
  border-color: var(--warm-orange);
  box-shadow: 0 10px 24px rgba(15, 76, 92, 0.3);
}

.btn--accent {
  background: var(--warm-orange);
  color: var(--deep-gray);
}

.btn--accent:hover {
  background: var(--snow-white);
  border-color: var(--warm-orange);
}

.btn--ghost {
  border-color: rgba(248, 250, 252, 0.55);
  color: var(--snow-white);
}

.btn--ghost:hover {
  background: var(--snow-white);
  border-color: var(--snow-white);
  color: var(--plateau-blue);
}

.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border-radius: 14px;
  background: linear-gradient(145deg, var(--sky-blue), var(--plateau-blue));
  box-shadow: 0 16px 40px rgba(27, 77, 137, 0.14);
}

.media-frame--wide {
  aspect-ratio: 16 / 9;
}

.media-frame--tall {
  aspect-ratio: 3 / 4;
}

.media-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 04 · 无障碍跳转 ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 1rem;
  z-index: 1200;
  padding: 0.625rem 1.25rem;
  background: var(--deep-teal);
  color: var(--snow-white);
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  border-radius: 999px;
  box-shadow: 0 4px 16px rgba(15, 76, 92, 0.35);
  transform: translateY(calc(-100% - 1.5rem));
  transition: transform var(--transition-fast);
}

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

/* ---------- 05 · 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--plateau-blue);
  box-shadow: 0 2px 12px rgba(27, 77, 137, 0.16);
  transition: box-shadow var(--transition-base);
}

.site-header[data-scrolled] {
  box-shadow: 0 8px 28px rgba(27, 77, 137, 0.3);
}

.site-header__top {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 0.75rem var(--container-pad);
  min-height: var(--header-top-height);
  overflow: hidden;
}

.site-header__top::before {
  content: '';
  position: absolute;
  right: 12%;
  bottom: 0;
  width: 260px;
  height: 100%;
  background: linear-gradient(180deg, rgba(107, 164, 184, 0.3), rgba(248, 250, 252, 0.05));
  clip-path: polygon(0% 100%, 18% 46%, 34% 72%, 50% 20%, 66% 58%, 82% 28%, 100% 100%);
  pointer-events: none;
  z-index: 0;
}

.site-header__brand,
.site-header__nav-toggle {
  position: relative;
  z-index: 1;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  color: var(--snow-white);
}

.site-header__logo,
.site-footer__logo {
  position: relative;
  display: inline-block;
  flex-shrink: 0;
}

.site-header__logo::before,
.site-header__logo::after,
.site-footer__logo::before,
.site-footer__logo::after {
  content: '';
  position: absolute;
  bottom: 0;
}

.site-header__logo::before,
.site-footer__logo::before {
  left: 1px;
  background: linear-gradient(150deg, var(--warm-orange) 35%, var(--plateau-blue) 100%);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  z-index: 2;
}

.site-header__logo::after,
.site-footer__logo::after {
  right: 1px;
  background: var(--sky-blue);
  clip-path: polygon(50% 0, 100% 100%, 0 100%);
  z-index: 1;
}

.site-header__logo {
  width: 38px;
  height: 42px;
}

.site-header__logo::before {
  width: 26px;
  height: 34px;
}

.site-header__logo::after {
  width: 24px;
  height: 24px;
}

.site-header__brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.site-header__name {
  font-family: var(--font-heading);
  font-size: 1.375rem;
  font-weight: 900;
  letter-spacing: 0.12em;
}

.site-header__tagline {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.18em;
  color: rgba(248, 250, 252, 0.78);
}

.site-header__nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.5rem 1.125rem;
  border: 1px solid rgba(248, 250, 252, 0.45);
  border-radius: 999px;
  color: var(--snow-white);
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
}

.site-header__nav-toggle:hover {
  background: rgba(248, 250, 252, 0.12);
  border-color: var(--warm-orange);
}

.site-header__nav-toggle[aria-expanded="true"] {
  background: var(--warm-orange);
  border-color: var(--warm-orange);
  color: var(--deep-gray);
}

.nav-toggle__icon {
  position: relative;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: background var(--transition-fast);
}

.nav-toggle__icon::before,
.nav-toggle__icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-fast), top var(--transition-fast);
}

.nav-toggle__icon::before {
  top: -6px;
}

.nav-toggle__icon::after {
  top: 6px;
}

.site-header__nav-toggle[aria-expanded="true"] .nav-toggle__icon {
  background: transparent;
}

.site-header__nav-toggle[aria-expanded="true"] .nav-toggle__icon::before {
  top: 0;
  transform: rotate(45deg);
}

.site-header__nav-toggle[aria-expanded="true"] .nav-toggle__icon::after {
  top: 0;
  transform: rotate(-45deg);
}

/* 下层导航 */
.site-header__nav {
  display: none;
  border-top: 3px solid var(--warm-orange);
  background: var(--snow-white);
  box-shadow: 0 6px 16px rgba(27, 77, 137, 0.1);
}

.site-header__nav-list {
  counter-reset: navIndex;
}

.site-header__nav-list li {
  counter-increment: navIndex;
}

.site-header__nav-list a {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1.125rem;
  font-family: var(--font-heading);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--deep-gray);
  border-radius: 999px;
  transition: color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.site-header__nav-list a::before {
  content: "0" counter(navIndex);
  font-family: var(--font-heading);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0;
  color: var(--plateau-blue);
  margin-right: 0.4375rem;
  transition: color var(--transition-fast);
}

.site-header__nav-list a:hover {
  color: var(--plateau-blue);
  background: rgba(107, 164, 184, 0.15);
  transform: translateY(-1px);
}

.site-header__nav-list a:hover::before {
  color: var(--warm-orange);
}

.site-header__nav-list a[aria-current="page"] {
  color: var(--snow-white);
  background: var(--plateau-blue);
}

.site-header__nav-list a[aria-current="page"]::before {
  color: rgba(248, 250, 252, 0.82);
}

@keyframes siteNavIn {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 06 · 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: auto;
  background: var(--deep-teal);
  color: rgba(248, 250, 252, 0.85);
  font-family: var(--font-body);
  font-size: 0.9375rem;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg,
    var(--warm-orange) 0%,
    var(--warm-orange) 20%,
    var(--gold) 20%,
    var(--gold) 40%,
    var(--wine-red) 40%,
    var(--wine-red) 60%,
    var(--plateau-blue) 60%,
    var(--plateau-blue) 80%,
    var(--indigo) 80%,
    var(--indigo) 100%);
}

.site-footer__inner {
  max-width: var(--container-max);
  margin-inline: auto;
  padding: 3.25rem var(--container-pad) 1.75rem;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.25rem;
}

@media (min-width: 768px) and (max-width: 1023px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }

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

@media (min-width: 1024px) {
  .site-footer__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr) minmax(0, 0.75fr);
    gap: 3rem;
  }
}

.site-footer__brand {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  align-content: start;
  column-gap: 0.875rem;
}

.site-footer__logo {
  width: 44px;
  height: 48px;
}

.site-footer__logo::before {
  width: 30px;
  height: 40px;
  background: linear-gradient(150deg, var(--warm-orange) 25%, var(--gold) 100%);
}

.site-footer__logo::after {
  width: 27px;
  height: 29px;
}

.site-footer__name {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 900;
  letter-spacing: 0.12em;
  color: var(--snow-white);
}

.site-footer__tagline {
  grid-column: 1 / -1;
  padding-left: calc(44px + 0.875rem);
  margin-top: 0.25rem;
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: rgba(248, 250, 252, 0.65);
}

.site-footer__desc {
  grid-column: 1 / -1;
  padding-left: calc(44px + 0.875rem);
  margin-top: 0.75rem;
  max-width: 32rem;
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(248, 250, 252, 0.72);
}

.site-footer__heading {
  font-family: var(--font-heading);
  font-size: 0.8125rem;
  font-weight: 900;
  letter-spacing: 0.18em;
  color: var(--gold);
  text-transform: uppercase;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  position: relative;
}

.site-footer__heading::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: 0;
  width: 2rem;
  height: 2px;
  background: var(--warm-orange);
}

.site-footer__contact p {
  margin-bottom: 0.375rem;
  line-height: 1.8;
  color: rgba(248, 250, 252, 0.82);
}

.site-footer__note {
  margin-top: 0.875rem;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(248, 250, 252, 0.22);
  font-size: 0.8125rem;
  line-height: 1.7;
  color: rgba(248, 250, 252, 0.62);
}

.site-footer__links ul {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.site-footer__links li a {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 0.9375rem;
  font-weight: 600;
  color: rgba(248, 250, 252, 0.88);
  transition: color var(--transition-fast), transform var(--transition-fast);
}

.site-footer__links li a::before {
  content: '› ';
  color: var(--warm-orange);
  font-weight: 900;
  margin-right: 0.25rem;
}

.site-footer__links li a:hover {
  color: var(--snow-white);
  transform: translateX(0.25rem);
}

.site-footer__trust {
  margin-top: 2.5rem;
  padding: 1rem 1.25rem;
  background: linear-gradient(90deg, rgba(58, 45, 120, 0.4), rgba(107, 164, 184, 0.16));
  border-left: 3px solid var(--gold);
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(248, 250, 252, 0.78);
}

.site-footer__bottom {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.375rem;
  margin-top: 2.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(248, 250, 252, 0.14);
  font-size: 0.8125rem;
  letter-spacing: 0.03em;
  color: rgba(248, 250, 252, 0.6);
}

@media (min-width: 768px) {
  .site-footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ---------- 07 · 响应式头部 ---------- */
@media (min-width: 768px) {
  .site-header__nav-toggle {
    display: none;
  }

  .site-header__nav {
    display: block;
  }

  .site-header__nav-list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    max-width: var(--container-max);
    margin-inline: auto;
    padding: 0 var(--container-pad);
    min-height: var(--nav-height);
  }
}

@media (max-width: 767px) {
  .site-header__nav[data-open] {
    display: block;
    animation: siteNavIn 0.3s var(--ease-out);
  }

  .site-header__nav-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.125rem;
    padding: 0.625rem var(--container-pad) 0.875rem;
  }

  .site-header__nav-list a {
    justify-content: flex-start;
    padding: 0.625rem 0.875rem;
    border-radius: 10px;
  }

  .site-header__name {
    font-size: 1.25rem;
  }

  .site-header__tagline {
    font-size: 0.6875rem;
  }
}

/* ---------- 08 · 滚动显现 ---------- */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
  will-change: opacity, transform;
}

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

.js [data-reveal-delay="1"] {
  transition-delay: 0.12s;
}

.js [data-reveal-delay="2"] {
  transition-delay: 0.24s;
}

.js [data-reveal-delay="3"] {
  transition-delay: 0.36s;
}

/* ---------- 09 · 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

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

  .site-header__nav-list a:hover,
  .btn:hover,
  .site-footer__links li a:hover {
    transform: none;
  }
}