/* ============================================================
   Nova Studio — Team Showcase
   基于 Pico.css (classless) 的自定义编辑风格主题
   暗色模式: prefers-color-scheme + data-theme 手动切换
   ============================================================ */

/* ---------- Design Tokens ---------- */
:root {
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Noto Naskh Arabic", sans-serif;

  --bg: #f7f9fc;
  --bg-elevated: #ffffff;
  --text: #101828;
  --text-muted: #5d6b82;
  --border: #e4e9f1;
  --accent: #2e6bff;
  --accent-strong: #1f55e0;
  --accent-soft: rgba(46, 107, 255, 0.09);
  --accent-inverse: #ffffff;
  --header-bg: rgba(247, 249, 252, 0.82);
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 10px 30px -12px rgba(16, 24, 40, 0.18);
  --shadow-lg: 0 24px 60px -20px rgba(16, 24, 40, 0.25);

  --pico-font-family: var(--font-sans);
  --pico-font-family-sans-serif: var(--font-sans);
  --pico-background-color: var(--bg);
  --pico-color: var(--text);
  --pico-muted-color: var(--text-muted);
  --pico-muted-border-color: var(--border);
  --pico-h1-color: var(--text);
  --pico-h2-color: var(--text);
  --pico-h3-color: var(--text);
  --pico-primary: var(--accent);
  --pico-primary-background: var(--accent);
  --pico-primary-border: var(--accent);
  --pico-primary-hover: var(--accent-strong);
  --pico-primary-hover-background: var(--accent-strong);
  --pico-primary-focus: var(--accent-soft);
  --pico-primary-inverse: var(--accent-inverse);
  --pico-card-background-color: var(--bg-elevated);
  --pico-card-border-color: var(--border);
  --pico-border-radius: 0.625rem;
  --pico-form-element-background-color: var(--bg-elevated);
  --pico-form-element-border-color: var(--border);
  --pico-form-element-active-border-color: var(--accent);
  --pico-form-element-focus-color: var(--accent-soft);
  --pico-form-element-placeholder-color: var(--text-muted);

  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #0c1220;
  --bg-elevated: #131b2e;
  --text: #e7ecf5;
  --text-muted: #93a0b5;
  --border: #223049;
  --accent: #5c8dff;
  --accent-strong: #7da4ff;
  --accent-soft: rgba(92, 141, 255, 0.16);
  --accent-inverse: #0c1220;
  --header-bg: rgba(12, 18, 32, 0.82);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 10px 30px -12px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.65);

  --pico-background-color: var(--bg);
  --pico-color: var(--text);
  --pico-muted-color: var(--text-muted);
  --pico-muted-border-color: var(--border);
  --pico-primary: var(--accent);
  --pico-primary-background: var(--accent);
  --pico-primary-border: var(--accent);
  --pico-primary-hover: var(--accent-strong);
  --pico-primary-hover-background: var(--accent-strong);
  --pico-primary-focus: var(--accent-soft);
  --pico-primary-inverse: var(--accent-inverse);
  --pico-card-background-color: var(--bg-elevated);
  --pico-card-border-color: var(--border);
  --pico-form-element-background-color: var(--bg-elevated);
  --pico-form-element-border-color: var(--border);

  color-scheme: dark;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0c1220;
    --bg-elevated: #131b2e;
    --text: #e7ecf5;
    --text-muted: #93a0b5;
    --border: #223049;
    --accent: #5c8dff;
    --accent-strong: #7da4ff;
    --accent-soft: rgba(92, 141, 255, 0.16);
    --accent-inverse: #0c1220;
    --header-bg: rgba(12, 18, 32, 0.82);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 10px 30px -12px rgba(0, 0, 0, 0.55);
    --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.65);

    --pico-background-color: var(--bg);
    --pico-color: var(--text);
    --pico-muted-color: var(--text-muted);
    --pico-muted-border-color: var(--border);
    --pico-primary: var(--accent);
    --pico-primary-background: var(--accent);
    --pico-primary-border: var(--accent);
    --pico-primary-hover: var(--accent-strong);
    --pico-primary-hover-background: var(--accent-strong);
    --pico-primary-focus: var(--accent-soft);
    --pico-primary-inverse: var(--accent-inverse);
    --pico-card-background-color: var(--bg-elevated);
    --pico-card-border-color: var(--border);
    --pico-form-element-background-color: var(--bg-elevated);
    --pico-form-element-border-color: var(--border);

    color-scheme: dark;
  }
}

/* ---------- Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  margin: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

::selection {
  background: var(--accent);
  color: var(--accent-inverse);
}

/* ---------- 内联图标 ---------- */
.icon {
  width: 1.25rem;
  height: 1.25rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  flex-shrink: 0;
}

.icon-btn .icon { width: 1.15rem; height: 1.15rem; }
.feature-icon .icon { width: 1.4rem; height: 1.4rem; }
.hero-meta .icon { width: 1.05rem; height: 1.05rem; }
.member-links .icon { width: 1.1rem; height: 1.1rem; }
.btn .icon { width: 1.05rem; height: 1.05rem; }

.container {
  width: min(1120px, 100% - 2.5rem);
  margin-inline: auto;
}

/* ---------- 标题排版 ---------- */
h1, h2, h3 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.25;
  color: var(--text);
}

.display {
  font-size: clamp(2.5rem, 6.5vw, 4.5rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.display .accent { color: var(--accent); }

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  margin-bottom: 1rem;
}

.lead {
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: var(--text-muted);
  max-width: 40em;
}

/* 眉题（小标签） */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 1rem;
}

.eyebrow::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
}

/* ---------- 区块 ---------- */
.section {
  padding: clamp(3.5rem, 8vw, 6.5rem) 0;
}

.section + .section { padding-top: 0; }

.section-head {
  max-width: 640px;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}

.section-head .lead { margin-bottom: 0; }

/* ---------- 页头导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--header-bg);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.site-header.scrolled {
  border-bottom-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--text);
  text-decoration: none;
}

.brand svg { color: var(--accent); }

.brand small {
  font-weight: 500;
  color: var(--text-muted);
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
}

.site-nav ul {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  display: block;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.site-nav a:hover {
  color: var(--text);
  background: var(--accent-soft);
}

.site-nav a[aria-current="page"] {
  color: var(--accent);
  background: var(--accent-soft);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  color: var(--text);
  cursor: pointer;
  padding: 0;
  transition: border-color 0.2s ease, transform 0.2s ease, background-color 0.2s ease;
}

.icon-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(12deg);
}

.icon-btn:focus-visible,
.site-nav a:focus-visible,
.btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

/* 主题图标：亮色显示月亮，暗色显示太阳 */
.icon-sun { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .icon-sun { display: block; }
  :root:not([data-theme="light"]) .icon-moon { display: none; }
}

/* 语言切换 */
.lang-switch {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--bg-elevated);
  overflow: hidden;
}

.lang-btn {
  border: 0;
  background: transparent;
  padding: 0.42rem 0.62rem;
  font-size: 0.8125rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: var(--text-muted);
  cursor: pointer;
  line-height: 1;
  transition: color 0.2s ease, background-color 0.2s ease;
}

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

.lang-btn.active {
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 600;
}

/* 移动端菜单按钮 */
.nav-toggle {
  display: none;
}

.nav-toggle .icon-close { display: none; }
.site-header.nav-open .nav-toggle .icon-close { display: block; }
.site-header.nav-open .nav-toggle .icon-menu { display: none; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.9375rem;
  font-weight: 600;
  font-family: var(--font-sans);
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease,
    background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.btn:active { transform: scale(0.97); }

.btn-primary {
  background: var(--accent);
  color: var(--accent-inverse);
  box-shadow: 0 8px 20px -8px var(--accent);
}

.btn-primary:hover {
  background: var(--accent-strong);
  color: var(--accent-inverse);
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -8px var(--accent);
}

.btn-outline {
  border-color: var(--border);
  color: var(--text);
  background: var(--bg-elevated);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

.btn-ghost {
  color: var(--accent);
  padding-inline: 0.4rem;
}

.btn-ghost:hover { text-decoration: underline; }

.btn-lg {
  padding: 0.95rem 2.1rem;
  font-size: 1rem;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  padding: clamp(4rem, 10vw, 8rem) 0 clamp(3.5rem, 8vw, 6rem);
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(42rem 24rem at 82% -10%, var(--accent-soft), transparent 65%),
    radial-gradient(30rem 20rem at 8% 110%, var(--accent-soft), transparent 60%);
  pointer-events: none;
}

.hero .container { position: relative; }

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem 1.75rem;
  margin-top: 2.5rem;
  color: var(--text-muted);
  font-size: 0.9375rem;
}

.hero-meta span {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.hero-meta svg { color: var(--accent); }

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 2.25rem;
}

/* 页面级 Hero（子页面） */
.page-hero {
  padding: clamp(3.5rem, 8vw, 6rem) 0 clamp(1rem, 3vw, 2rem);
}

/* ---------- 数据带 ---------- */
.stats {
  border-block: 1px solid var(--border);
  padding: 2.25rem 0;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.stat {
  text-align: center;
}

.stat b {
  display: block;
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1.2;
}

.stat span {
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ---------- 网格与卡片 ---------- */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 1rem;
  padding: 1.75rem;
  transition: transform 0.25s ease, box-shadow 0.25s ease, border-color 0.25s ease;
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: color-mix(in srgb, var(--accent) 35%, var(--border));
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 0.8rem;
  background: var(--accent-soft);
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.card h3 {
  font-size: 1.125rem;
  margin: 0 0 0.5rem;
}

.card p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  margin: 0;
}

/* 成员卡片 */
.member-card {
  text-align: center;
  padding: 2rem 1.5rem;
}

.member-card img {
  width: 6.25rem;
  height: 6.25rem;
  border-radius: 50%;
  object-fit: cover;
  margin: 0 auto 1.1rem;
  border: 3px solid var(--bg-elevated);
  box-shadow: 0 0 0 2px var(--border);
}

.member-card h3 { margin-bottom: 0.15rem; }

.member-role {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin: 0 0 0.75rem;
}

.member-bio {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0 0 1.1rem;
}

.skill-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 1.2rem;
}

.chip {
  font-size: 0.75rem;
  font-weight: 500;
  padding: 0.22rem 0.7rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
}

.member-links {
  display: flex;
  justify-content: center;
  gap: 0.6rem;
}

.member-links a {
  color: var(--text-muted);
  transition: color 0.2s ease, transform 0.2s ease;
}

.member-links a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* 项目卡片 */
.project-card {
  padding: 0;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.project-card figure {
  margin: 0;
  overflow: hidden;
  aspect-ratio: 16 / 10;
}

.project-card figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.project-card:hover figure img { transform: scale(1.05); }

.project-card .body {
  padding: 1.4rem 1.5rem 1.6rem;
}

.project-card .meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.6rem;
}

.project-card .year {
  font-size: 0.8125rem;
  color: var(--text-muted);
}

.project-card h3 {
  font-size: 1.15rem;
  margin: 0 0 0.4rem;
  transition: color 0.2s ease;
}

.project-card:hover h3 { color: var(--accent); }

.project-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin: 0;
}

/* ---------- 引言 / 评价 ---------- */
.quote-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.quote-card blockquote {
  margin: 0 0 1.1rem;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.quote-card figcaption {
  font-size: 0.875rem;
  font-weight: 600;
}

.quote-card figcaption span {
  display: block;
  font-weight: 400;
  color: var(--text-muted);
  font-size: 0.8125rem;
}

.quote-mark {
  color: var(--accent);
  font-size: 1.75rem;
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
  font-family: Georgia, serif;
}

/* ---------- CTA 横幅 ---------- */
.cta-banner {
  background: var(--accent);
  color: var(--accent-inverse);
  border-radius: 1.5rem;
  padding: clamp(2.5rem, 6vw, 4.5rem);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(30rem 16rem at 85% 120%, rgba(255, 255, 255, 0.18), transparent 60%);
  pointer-events: none;
}

.cta-banner h2 {
  color: inherit;
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  margin: 0 0 0.75rem;
}

.cta-banner p {
  opacity: 0.85;
  margin: 0 auto 1.75rem;
  max-width: 34em;
}

.cta-banner .btn {
  background: var(--accent-inverse);
  color: var(--accent);
  border: none;
}

.cta-banner .btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px -10px rgba(0, 0, 0, 0.35);
}

.cta-banner .btn-primary,
.cta-banner .btn-primary:hover {
  background: var(--accent-inverse);
  color: var(--accent);
}

/* ---------- 联系页 ---------- */
.form-stack > * + * { margin-top: 0.55rem; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: start;
}

.contact-item {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--border);
}

.contact-item:last-child { border-bottom: none; }

.contact-item .feature-icon {
  width: 2.6rem;
  height: 2.6rem;
  margin: 0;
  flex-shrink: 0;
  border-radius: 0.7rem;
}

.contact-item h3 {
  font-size: 0.9375rem;
  margin: 0 0 0.15rem;
}

.contact-item p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--text-muted);
}

.contact-item a { color: var(--text); }
.contact-item a:hover { color: var(--accent); }

.about-photo {
  border-radius: 1.25rem;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-photo img { width: 100%; }

/* ---------- 流程 ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  counter-reset: step;
}

.process-step { position: relative; }

.process-step .num {
  display: block;
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent-soft);
  -webkit-text-stroke: 1.5px var(--accent);
  line-height: 1;
  margin-bottom: 0.9rem;
}

.process-step h3 {
  font-size: 1.05rem;
  margin: 0 0 0.4rem;
}

.process-step p {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0;
}

/* ---------- FAQ ---------- */
details summary {
  font-weight: 600;
  cursor: pointer;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 3.5rem 0 2rem;
  margin-top: clamp(3.5rem, 8vw, 6rem);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
  margin-bottom: 2.5rem;
}

.site-footer h4 {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 1rem;
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer li { margin-bottom: 0.55rem; }

.site-footer a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9375rem;
  transition: color 0.2s ease;
}

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

.footer-brand p {
  color: var(--text-muted);
  font-size: 0.9375rem;
  max-width: 30em;
  margin: 0.9rem 0 0;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

/* ---------- 滚动进入动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.6s ease, transform 0.6s ease;
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .card:hover,
  .project-card:hover figure img,
  .btn:hover,
  .btn-primary:hover,
  .btn-outline:hover { transform: none; }
}

/* ---------- 阿拉伯语 RTL 适配 ---------- */
[dir="rtl"] .icon-dir { transform: scaleX(-1); }

[dir="rtl"] .display,
[dir="rtl"] h1,
[dir="rtl"] h2,
[dir="rtl"] h3,
[dir="rtl"] .eyebrow,
[dir="rtl"] .stat b,
[dir="rtl"] .process-step .num {
  letter-spacing: 0;
}

[dir="rtl"] .eyebrow { text-transform: none; }

[dir="rtl"] body,
[dir="rtl"] .btn,
[dir="rtl"] .lang-btn {
  line-height: 1.9;
}

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .grid-3, .grid-4, .quote-grid { grid-template-columns: repeat(2, 1fr); }
  .process-grid { grid-template-columns: repeat(2, 1fr); gap: 2rem; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  /* 移动端导航 */
  .nav-toggle {
    display: inline-flex;
  }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-md);
    padding: 0.75rem 1.25rem 1.25rem;
    display: none;
  }

  .site-header.nav-open .site-nav { display: block; }

  .site-nav ul {
    flex-direction: column;
    align-items: stretch;
    gap: 0.25rem;
  }

  .site-nav a {
    padding: 0.7rem 0.9rem;
    border-radius: 0.6rem;
  }

  .stats-grid { grid-template-columns: repeat(2, 1fr); row-gap: 1.75rem; }
}

@media (max-width: 560px) {
  .grid-3, .grid-4, .quote-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.75rem; }
  .hero-actions .btn { width: 100%; }
  .brand small { display: none; }
}