/* ==========================================================================
   base.css — 重置、基础排版、布局容器与工具类
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

* {
  margin: 0;
  padding: 0;
}

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 16px);
}

/* 移动端顶栏更矮，锚点补偿同步收窄 */
@media (max-width: 1080px) {
  html {
    scroll-padding-top: calc(var(--nav-h-mobile) + 12px);
  }
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: var(--lh-body);
  color: var(--c-ink);
  background-color: var(--c-surface);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

button {
  background: none;
  border: 0;
  cursor: pointer;
}

table {
  border-collapse: collapse;
  border-spacing: 0;
  width: 100%;
}

ul,
ol {
  list-style: none;
}

a {
  color: var(--c-blue-600);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}

a:hover {
  color: var(--c-blue-700);
}

/* --------------------------------------------------------------------------
   2. 排版
   -------------------------------------------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--fw-black);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  color: var(--c-navy-900);
}

/* 英文与数字使用 Times New Roman，中文回退黑体 */
h1,
h2,
h3,
h4 .num,
.num,
.figure {
  font-feature-settings: "tnum" 1;
}

h1 {
  font-size: var(--fs-h1);
}

h2 {
  font-size: var(--fs-h2);
}

h3 {
  font-size: var(--fs-h3);
}

h4 {
  font-size: var(--fs-h4);
}

p {
  color: var(--c-ink-2);
}

strong,
b {
  font-weight: var(--fw-bold);
  color: var(--c-navy-900);
}

/* 英文 / 数字：Times New Roman */
.serif,
.num-en {
  font-family: var(--font-serif);
}

::selection {
  background: var(--c-gold-300);
  color: var(--c-navy-900);
}

/* --------------------------------------------------------------------------
   3. 焦点可见性（可访问性）
   -------------------------------------------------------------------------- */
:focus-visible {
  outline: 3px solid var(--c-gold-500);
  outline-offset: 3px;
  border-radius: var(--radius-xs);
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: var(--z-modal);
  padding: 12px 20px;
  background: var(--c-navy-900);
  color: #fff;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  font-weight: var(--fw-medium);
  transition: top var(--dur) var(--ease-out);
}

.skip-link:focus {
  top: 0;
  color: #fff;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   4. 布局容器
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.container--wide {
  max-width: var(--container-wide);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* 区块 */
.section {
  padding-block: var(--section-y);
  position: relative;
}

.section--sm {
  padding-block: var(--section-y-sm);
}

.section--tint {
  background-color: var(--c-surface-2);
}

.section--blue {
  background-color: var(--c-blue-50);
}

.section--navy {
  background-color: var(--c-navy-900);
  color: var(--c-on-dark);
}

.section--navy h2,
.section--navy h3,
.section--navy h4 {
  color: var(--c-on-dark);
}

.section--navy p {
  color: var(--c-on-dark-2);
}

.section--hairline-top {
  border-top: var(--border-hairline);
}

/* --------------------------------------------------------------------------
   5. 区块标题组
   -------------------------------------------------------------------------- */
.section-head {
  max-width: 760px;
  margin-bottom: clamp(32px, 4vw, 56px);
}

.section-head--center {
  margin-inline: auto;
  text-align: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-serif);
  font-size: var(--fs-eyebrow);
  font-weight: var(--fw-bold);
  letter-spacing: var(--ls-wider);
  text-transform: uppercase;
  color: var(--c-blue-600);
  margin-bottom: 14px;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--c-gold-500);
  flex: none;
}

.section-head--center .eyebrow {
  justify-content: center;
}

.section-head--center .eyebrow::before {
  display: none;
}

/* 单独使用且需居中时（例如深色 CTA 区块顶部小标签） */
.eyebrow--center {
  display: flex;
  justify-content: center;
}

.eyebrow--center::before {
  display: none;
}

.section-head p {
  font-size: var(--fs-lead);
  margin-top: 16px;
}

.section--navy .eyebrow {
  color: var(--c-gold-400);
}

.section--navy .section-head p {
  color: var(--c-on-dark-2);
}

/* --------------------------------------------------------------------------
   6. 网格
   -------------------------------------------------------------------------- */
.grid {
  display: grid;
  gap: clamp(16px, 2vw, 24px);
}

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

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

.grid--4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid--5 {
  grid-template-columns: repeat(5, minmax(0, 1fr));
}

.grid--auto {
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}

.grid--gap-lg {
  gap: clamp(24px, 3vw, 40px);
}

@media (max-width: 1024px) {
  .grid--4,
  .grid--5 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid--3 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .grid--2,
  .grid--3,
  .grid--4,
  .grid--5 {
    grid-template-columns: minmax(0, 1fr);
  }
}

/* --------------------------------------------------------------------------
   7. 工具类
   -------------------------------------------------------------------------- */
.text-center {
  text-align: center;
}

.mt-0 { margin-top: 0; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-40 { margin-top: 40px; }
.mt-48 { margin-top: 48px; }

.hairline {
  height: 1px;
  background: var(--c-line);
  border: 0;
}

.section--navy .hairline {
  background: var(--c-on-dark-line);
}

.tag-note {
  display: inline-block;
  padding: 4px 12px;
  font-size: var(--fs-xs);
  color: var(--c-gold-700);
  background: var(--c-gold-50);
  border: 1px solid var(--c-gold-300);
  border-radius: var(--radius-pill);
}

/* 奖项等级标签：四个等级统一尺寸（等宽、居中），
   保证「奖项」列内的文字左边缘完全对齐，不会因为只有一等奖带底框而错位。 */
.tag-rank {
  display: inline-block;
  min-width: 4.5rem;
  padding: 5px 10px;
  font-size: var(--fs-xs);
  font-weight: var(--fw-bold);
  line-height: 1.4;
  text-align: center;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.tag-rank--1 {
  color: var(--c-gold-700);
  background: var(--c-gold-50);
  border-color: var(--c-gold-300);
}

.tag-rank--2 {
  color: var(--c-blue-700);
  background: var(--c-blue-50);
  border-color: var(--c-blue-100);
}

.tag-rank--3 {
  color: var(--c-navy-700);
  background: var(--c-surface-3);
  border-color: var(--c-line-strong);
}

.tag-rank--4 {
  color: var(--c-ink-3);
  background: var(--c-surface-2);
  border-color: var(--c-line);
}

/* --------------------------------------------------------------------------
   8. 滚动进场动画（由 assets/js/site.js 驱动）
      默认不加动画，避免禁用 JS 时内容不可见
   -------------------------------------------------------------------------- */
.js-reveal-ready .reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur-slow) var(--ease-out),
    transform var(--dur-slow) var(--ease-out);
  will-change: opacity, transform;
}

.js-reveal-ready .reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .js-reveal-ready .reveal {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}

/* --------------------------------------------------------------------------
   9. 打印
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .site-footer,
  .back-to-top,
  .hero__actions {
    display: none !important;
  }
  body {
    color: #000;
  }
  .section {
    padding-block: 16px;
  }
}