/* ============================================================
 * 澄源知本 · 官网基座样式
 * 依赖 tokens.css（须先于本文件引入）。
 * 提供：reset / 布局 / 导航 / 按钮 / 文字 / 卡片 / 页脚 /
 *       [data-reveal] 滚动显现 / .divider-herb / 三档响应式。
 * 页面级样式（home.css、register.css）不得重复定义本文件的类。
 * ============================================================ */

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

html {
  scroll-behavior: smooth;
  /* 固定导航下的锚点落点补偿 */
  scroll-padding-top: calc(var(--nav-height) + var(--sp-4));
  -webkit-text-size-adjust: 100%;
}

body {
  min-height: 100vh;
  background-color: var(--pine-950);
  color: var(--ink-body);
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.3;
  color: var(--ink-strong);
}

p { line-height: 1.75; }

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

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

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

button {
  background: none;
  border: none;
  cursor: pointer;
}

ul, ol { list-style: none; }

::selection {
  background: var(--gold-weak);
  color: var(--gold-300);
}

:focus-visible {
  outline: 2px solid var(--gold-500);
  outline-offset: 3px;
  border-radius: var(--radius-s);
}

/* 细滚动条：深松底、鎏金thumb */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: var(--pine-990); }
::-webkit-scrollbar-thumb {
  background: var(--pine-700);
  border-radius: var(--radius-full);
  border: 2px solid var(--pine-990);
}
::-webkit-scrollbar-thumb:hover { background: var(--gold-600); }

/* ------------------------------------------------------------
 * 1. 布局
 * ------------------------------------------------------------ */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: var(--sp-24);
}

/* ------------------------------------------------------------
 * 2. 导航
 * ------------------------------------------------------------ */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-height);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--dur-med) var(--ease-out),
    border-color var(--dur-med) var(--ease-out),
    box-shadow var(--dur-med) var(--ease-out);
}

/* 滚动态：深松毛玻璃 */
.site-nav.is-scrolled {
  background: rgba(7, 26, 21, 0.82);
  -webkit-backdrop-filter: blur(14px) saturate(1.2);
  backdrop-filter: blur(14px) saturate(1.2);
  border-bottom-color: rgba(201, 168, 106, 0.14);
  box-shadow: 0 8px 32px rgba(3, 12, 9, 0.45);
}

.site-nav__inner {
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--sp-6);
}

.site-nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  flex-shrink: 0;
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-strong);
}

.site-nav__brand img,
.site-nav__brand svg {
  width: 34px;
  height: 34px;
  flex-shrink: 0;
}

.site-nav__brand:hover { color: var(--gold-300); }

.site-nav__links {
  display: flex;
  align-items: center;
  gap: var(--sp-8);
  margin-left: auto;
}

.site-nav__links a {
  position: relative;
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  color: var(--ink-body);
  padding-block: var(--sp-1);
}

/* 链接下划金线 */
.site-nav__links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 1px;
  background: var(--gold-gradient);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur-med) var(--ease-out);
}

.site-nav__links a:hover { color: var(--gold-300); }
.site-nav__links a:hover::after { transform: scaleX(1); }

.site-nav__cta {
  flex-shrink: 0;
  margin-left: var(--sp-4);
}

/* 汉堡按钮（移动端） */
.site-nav__toggle {
  display: none;
  position: relative;
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: var(--radius-s);
  transition: background-color var(--dur-fast) var(--ease-out);
}

.site-nav__toggle:hover { background: var(--gold-weak); }

.site-nav__toggle span {
  position: absolute;
  left: 10px;
  right: 10px;
  height: 1.5px;
  background: var(--gold-400);
  border-radius: var(--radius-full);
  transition:
    transform var(--dur-med) var(--ease-spring),
    opacity var(--dur-fast) var(--ease-out),
    top var(--dur-med) var(--ease-spring);
}

.site-nav__toggle span:nth-child(1) { top: 13px; }
.site-nav__toggle span:nth-child(2) { top: 19px; }
.site-nav__toggle span:nth-child(3) { top: 25px; }

.site-nav__toggle[aria-expanded="true"] span:nth-child(1) {
  top: 19px;
  transform: rotate(45deg);
}
.site-nav__toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.site-nav__toggle[aria-expanded="true"] span:nth-child(3) {
  top: 19px;
  transform: rotate(-45deg);
}

/* 移动端抽屉 */
.site-nav__drawer {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  z-index: 99;
  background: rgba(5, 15, 12, 0.96);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
  border-bottom: var(--line-faint);
  padding: var(--sp-6) 24px var(--sp-8);
  opacity: 0;
  transform: translateY(-12px);
  visibility: hidden;
  transition:
    opacity var(--dur-med) var(--ease-out),
    transform var(--dur-med) var(--ease-out),
    visibility 0s linear var(--dur-med);
}

.site-nav__drawer.is-open {
  opacity: 1;
  transform: translateY(0);
  visibility: visible;
  transition:
    opacity var(--dur-med) var(--ease-out),
    transform var(--dur-med) var(--ease-out),
    visibility 0s;
}

.site-nav__drawer a:not(.btn) {
  display: block;
  padding: var(--sp-3) 0;
  font-size: 1rem;
  letter-spacing: 0.06em;
  color: var(--ink-body);
  border-bottom: 1px solid rgba(201, 168, 106, 0.08);
}

.site-nav__drawer a:last-of-type { border-bottom: none; }
.site-nav__drawer a:not(.btn):hover { color: var(--gold-300); padding-left: var(--sp-2); }
.site-nav__drawer a:not(.btn) { transition: color var(--dur-fast) var(--ease-out), padding-left var(--dur-med) var(--ease-out); }

.site-nav__drawer .btn { margin-top: var(--sp-4); width: 100%; }

/* ------------------------------------------------------------
 * 3. 按钮
 * ------------------------------------------------------------ */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--sp-2);
  padding: 12px 28px;
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.1em;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  transition:
    transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-med) var(--ease-out),
    background-color var(--dur-fast) var(--ease-out),
    border-color var(--dur-fast) var(--ease-out),
    color var(--dur-fast) var(--ease-out);
}

.btn:active { transform: translateY(1px) scale(0.98); }

/* 鎏金渐变实心 */
.btn--gold {
  background: var(--gold-gradient);
  background-size: 180% 100%;
  background-position: 0% 0%;
  color: var(--pine-990);
  box-shadow: 0 6px 20px rgba(201, 168, 106, 0.22);
}

/* 流光：hover 时一道高光扫过 */
.btn--gold::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    105deg,
    transparent 35%,
    rgba(250, 246, 236, 0.5) 50%,
    transparent 65%
  );
  transform: translateX(-130%) skewX(-8deg);
  transition: transform var(--dur-slow) var(--ease-out);
  pointer-events: none;
}

.btn--gold:hover {
  background-position: 100% 0%;
  box-shadow: var(--glow-gold), 0 10px 28px rgba(201, 168, 106, 0.3);
  transform: translateY(-2px);
  transition:
    transform var(--dur-fast) var(--ease-out),
    box-shadow var(--dur-med) var(--ease-out),
    background-position var(--dur-slow) var(--ease-out);
}

.btn--gold:hover::after { transform: translateX(130%) skewX(-8deg); }

/* 描边透明 */
.btn--ghost {
  background: rgba(201, 168, 106, 0.04);
  border: 1px solid rgba(201, 168, 106, 0.4);
  color: var(--gold-400);
}

.btn--ghost:hover {
  border-color: var(--gold-400);
  background: var(--gold-weak);
  color: var(--gold-300);
  box-shadow: var(--glow-gold);
  transform: translateY(-2px);
}

/* 鎏金光晕呼吸 */
.btn--glow {
  animation: btn-glow-breathe 2.8s var(--ease-out) infinite;
}

@keyframes btn-glow-breathe {
  0%, 100% { box-shadow: 0 0 14px rgba(201, 168, 106, 0.18), 0 6px 20px rgba(201, 168, 106, 0.16); }
  50%       { box-shadow: 0 0 34px rgba(201, 168, 106, 0.42), 0 8px 26px rgba(201, 168, 106, 0.3); }
}

/* 大按钮 */
.btn--lg {
  padding: 16px 40px;
  font-size: 1rem;
}

/* ------------------------------------------------------------
 * 4. 文字
 * ------------------------------------------------------------ */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-size: var(--fs-tiny);
  font-weight: 600;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: var(--gold-500);
  margin-bottom: var(--sp-4);
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--gold-gradient);
}

.display {
  font-family: var(--font-serif);
  font-size: var(--fs-display);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: 0.04em;
  color: var(--ink-strong);
}

.lead {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.9;
  color: var(--ink-body);
  max-width: 36em;
}

/* 鎏金渐变文字 */
.gold-text {
  background: var(--gold-gradient);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ------------------------------------------------------------
 * 5. 卡片
 * ------------------------------------------------------------ */
.card {
  position: relative;
  background: var(--pine-900);
  border: var(--line-faint);
  border-radius: var(--radius-l);
  box-shadow: var(--shadow-card);
  padding: var(--sp-8);
  transition:
    transform var(--dur-med) var(--ease-out),
    box-shadow var(--dur-med) var(--ease-out),
    border-color var(--dur-med) var(--ease-out);
}

/* 金边光晕：1px 渐变描边层，hover 渐显 */
.card::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(
    135deg,
    rgba(238, 221, 180, 0.75) 0%,
    rgba(201, 168, 106, 0.12) 45%,
    rgba(201, 168, 106, 0.5) 100%
  );
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--dur-med) var(--ease-out);
  pointer-events: none;
}

.card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-card), var(--glow-gold);
  border-color: rgba(201, 168, 106, 0.28);
}

.card:hover::before { opacity: 1; }

/* ------------------------------------------------------------
 * 6. 页脚
 * ------------------------------------------------------------ */
.site-footer {
  background: var(--pine-990);
  border-top: var(--line-faint);
  padding-top: var(--sp-16);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: var(--sp-10);
  padding-bottom: var(--sp-12);
}

.site-footer__brand {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.site-footer__logo {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-3);
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--ink-strong);
}

.site-footer__logo img,
.site-footer__logo svg {
  width: 32px;
  height: 32px;
}

.site-footer__slogan,
.site-footer__motto {
  font-family: var(--font-serif);
  font-size: var(--fs-small);
  letter-spacing: 0.06em;
  line-height: 1.8;
  overflow-wrap: anywhere;
  color: var(--gold-500);
}

.site-footer__desc {
  font-size: var(--fs-small);
  color: var(--ink-muted);
  max-width: 30em;
}

.site-footer__title {
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--ink-strong);
  margin-bottom: var(--sp-4);
}

.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.site-footer__links a {
  font-size: var(--fs-small);
  color: var(--ink-muted);
  width: fit-content;
}

.site-footer__links a:hover { color: var(--gold-300); }

/* 页脚栏目（h4 + 直接 a 子元素写法，与 __title/__links 等效） */
.site-footer__col {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
}

.site-footer__col h4 {
  font-family: var(--font-sans);
  font-size: var(--fs-small);
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--ink-strong);
  margin: 0 0 var(--sp-1);
}

.site-footer__col a {
  font-size: var(--fs-small);
  color: var(--ink-muted);
  width: fit-content;
}

.site-footer__col a:hover { color: var(--gold-300); }

.site-footer__legal p {
  font-size: var(--fs-tiny);
  color: var(--ink-faint);
  margin: 0;
  max-width: 24em;
}

.site-footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--sp-3);
  padding-block: var(--sp-6);
  border-top: 1px solid rgba(201, 168, 106, 0.1);
  font-size: var(--fs-tiny);
  color: var(--ink-faint);
}

/* ------------------------------------------------------------
 * 7. 滚动显现 [data-reveal]
 * ------------------------------------------------------------ */
[data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  filter: blur(6px);
  transition:
    opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out),
    filter var(--dur-slow) var(--ease-out);
  will-change: opacity, transform, filter;
}

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

/* ------------------------------------------------------------
 * 8. 分隔纹样 · 一茎三叶
 * ------------------------------------------------------------ */
.divider-herb {
  width: min(240px, 60%);
  height: 24px;
  margin-inline: auto;
  background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 240 24' fill='none' stroke='%23C9A86A' stroke-width='1' stroke-linecap='round'%3E%3Cline x1='2' y1='12' x2='98' y2='12' opacity='0.45'/%3E%3Ccircle cx='102' cy='12' r='1.4' fill='%23C9A86A' stroke='none' opacity='0.7'/%3E%3Cline x1='142' y1='12' x2='238' y2='12' opacity='0.45'/%3E%3Ccircle cx='138' cy='12' r='1.4' fill='%23C9A86A' stroke='none' opacity='0.7'/%3E%3Cpath d='M120 21 C120 16 120 9 120 4'/%3E%3Cpath d='M120 6 C117 4 117 1.5 120 1 C123 1.5 123 4 120 6 Z'/%3E%3Cpath d='M120 11 C115 10 111 7 110 3.5 C114.5 5.5 118 8 120 11 Z'/%3E%3Cpath d='M120 15 C125 14 129 11 130 7.5 C125.5 9.5 122 12 120 15 Z'/%3E%3C/svg%3E") center / auto 100% no-repeat;
}

/* ------------------------------------------------------------
 * 9. 动效降级
 * ------------------------------------------------------------ */
@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;
  }

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

  .btn--glow { animation: none; box-shadow: var(--glow-gold); }
  .btn--gold:hover::after { transform: none; opacity: 0; }
}

/* ------------------------------------------------------------
 * 10. 响应式 · 三档（≥1200 为基准档）
 * ------------------------------------------------------------ */

/* 中档：768–1199（平板 / 窄桌面） */
@media (max-width: 1199px) {
  .site-footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--sp-8);
  }

  .site-nav__links { gap: var(--sp-6); }
}

/* 小档：<768（手机） */
@media (max-width: 767px) {
  .section { padding-block: var(--sp-16); }

  /* 顶栏只留印与 CTA，链接收进抽屉 */
  .site-nav__links,
  .site-nav__cta { display: none; }

  .site-nav__toggle { display: block; }
  .site-nav__drawer { display: block; }

  .btn { padding: 11px 24px; }
  .btn--lg { padding: 14px 32px; font-size: var(--fs-small); }

  .eyebrow { letter-spacing: 0.3em; }

  .card { padding: var(--sp-6); }

  .site-footer { padding-top: var(--sp-12); }
  .site-footer__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-8);
  }

  .site-footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }

}