/* ============================================================
   alanalan.cn — 统一设计系统
   融合主仓（暗色 EDA 主题 + 4 分类强调色）与 PhysicsHub 复刻示例
   （固定顶栏 / 滑动下划线 / 星空渐变 Hero / 卡片画廊 / 亮色主题）
   ============================================================ */

/* ---- DESIGN TOKENS（暗色为默认）---- */
:root {
  /* 品牌强调色（Hero / 按钮 / 导航） */
  --accent-color: #00f2fe;
  --glow-color: #fff;
  --stars-color: #ffffff;

  /* 基础背景 / 文本（暗色 EDA） */
  --bg-color: #0d1117;
  --bg-surface: #161b22;
  --bg-elevated: #1c2333;
  --card-bg: #11161f;
  --border: #30363d;
  --border-hover: #484f58;

  /* 分类强调色（核心品牌差异化） */
  --accent-green: #00ff66;
  --accent-cyan: #00f2fe;
  --accent-orange: #ff6600;
  --accent-purple: #bc8cff;

  /* 文本 */
  --text-primary: #e6edf3;
  --text-secondary: #8b949e;
  --text-tertiary: #6e7681;
  --text-muted: rgba(230, 237, 243, 0.6);
  --text-placeholder: #6e7681;
  --footer-link-color: #e6edf3;

  /* 网格装饰 */
  --ph-grid: rgba(115, 130, 175, 0.16);

  /* 布局 */
  --content-max-width: 1400px;
  --header-height: 64px;
  --card-min-width: 300px;
  --grid-gap: 20px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --border-radius: 12px;
  --ph-radius: 14px;

  /* 动效 */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono: "SF Mono", "Fira Code", "Fira Mono", "Roboto Mono", "Lucida Console", Monaco, monospace;
}

/* ---- 亮色主题 ---- */
html[data-theme="light"] {
  --bg-color: #ffffff;
  --bg-surface: #f8f9fa;
  --bg-elevated: #eef1f5;
  --card-bg: #ffffff;
  --border: rgba(0, 0, 0, 0.12);
  --border-hover: rgba(0, 0, 0, 0.25);

  --text-primary: #1a1a1a;
  --text-secondary: rgba(0, 0, 0, 0.6);
  --text-tertiary: rgba(0, 0, 0, 0.45);
  --text-muted: rgba(0, 0, 0, 0.6);
  --text-placeholder: #999;
  --footer-link-color: #1a1a1a;

  --ph-grid: rgba(0, 0, 0, 0.07);
}

/* ---- RESET / BASE ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-color);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}
a { color: inherit; text-decoration: none; transition: color var(--transition-fast); }
img { max-width: 100%; height: auto; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
ul { list-style: none; }
.hidden { display: none !important; }

/* ---- HEADER + NAV ---- */
.site-header {
  position: relative; z-index: 100;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--bg-color), transparent 8%);
  backdrop-filter: blur(10px);
}
.header-inner {
  max-width: var(--content-max-width); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.85rem 1.5rem; min-height: var(--header-height);
}
.logo { display: flex; align-items: center; gap: 0.55rem; font-weight: 800; font-size: 1.15rem; letter-spacing: -0.02em; }
.logo-mark {
  width: 2rem; height: 2rem; border-radius: 10px; display: grid; place-items: center;
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent-color), white 22%), var(--accent-color));
  color: #001919; font-size: 1.05rem; box-shadow: 0 0 22px color-mix(in oklab, var(--accent-color), transparent 60%);
}
.logo b { color: var(--accent-color); }
nav { position: relative; flex: 1; display: flex; justify-content: center; }
nav ul { display: flex; position: relative; justify-content: center; gap: clamp(1rem, 3vw, 2.5rem); }
nav a {
  position: relative; padding: 0.5rem; color: var(--text-secondary);
  transition: color 0.3s; font-weight: 500;
}
nav a:hover, nav a.active { color: var(--text-primary); }
nav a::after {
  content: ""; position: absolute; bottom: -3px; left: 0; width: 0; height: 2px;
  background: var(--accent-color); transition: width 0.3s;
}
nav a:hover::after, nav a.active::after { width: 100%; }
.nav-underline {
  position: absolute; bottom: -3px; left: 0; height: 2px;
  background: var(--accent-color); border-radius: 2px; transition: left 0.3s ease, width 0.3s ease; z-index: 100;
}
.controls { display: flex; align-items: center; gap: 0.6rem; flex-shrink: 0; }
.icon-btn {
  width: 2.4rem; height: 2.4rem; border-radius: 0.7rem; display: grid; place-items: center; font-size: 1.05rem;
  background: rgba(255, 255, 255, 0.04); border: 1px solid var(--border); color: var(--text-primary);
  transition: transform 0.2s ease, background 0.2s ease;
}
.icon-btn:hover { transform: translateY(-1px); background: rgba(255, 255, 255, 0.08); }
.menu-toggle { display: none; background: none; border: none; color: var(--accent-color); font-size: 1.5rem; }

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.7rem 1.3rem; border-radius: 0.7rem; font-weight: 700; font-size: 0.92rem;
  border: 1px solid transparent; transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}
.btn--primary {
  color: #001919;
  background: linear-gradient(180deg, color-mix(in oklab, var(--accent-color), white 24%), var(--accent-color));
  box-shadow: 0 12px 28px color-mix(in oklab, var(--accent-color), transparent 68%);
}
.btn--primary:hover { transform: translateY(-2px); }
.btn--ghost {
  color: var(--text-primary); background: rgba(255, 255, 255, 0.04);
  border-color: color-mix(in oklab, var(--accent-color), transparent 64%);
}
.btn--ghost:hover { transform: translateY(-2px); background: color-mix(in oklab, var(--accent-color), transparent 88%); }

/* ---- HERO ---- */
.ph-hero {
  position: relative; isolation: isolate; overflow: clip;
  padding: clamp(3rem, 7vw, 5rem) 0 clamp(2.5rem, 5vw, 4rem);
  background:
    radial-gradient(circle at 72% 18%, color-mix(in oklab, var(--accent-color), transparent 74%), transparent 30rem),
    linear-gradient(135deg, rgba(4, 8, 17, 0.4), rgba(10, 17, 31, 0.15) 46%, color-mix(in oklab, var(--accent-color), transparent 90%));
}
html[data-theme="light"] .ph-hero {
  background:
    radial-gradient(circle at 72% 18%, color-mix(in oklab, var(--accent-color), transparent 86%), transparent 30rem),
    linear-gradient(135deg, rgba(0, 0, 0, 0.03), rgba(0, 0, 0, 0.01) 46%, color-mix(in oklab, var(--accent-color), transparent 94%));
}
.ph-hero__container {
  position: relative; width: min(1180px, calc(100% - 2rem)); max-width: 1180px;
  margin: 0 auto; padding: clamp(1.5rem, 4vw, 3rem);
  color: var(--text-primary);
}
.ph-hero__container--landing {
  display: grid; grid-template-columns: minmax(0, 1.02fr) minmax(330px, 0.78fr);
  gap: clamp(2rem, 5vw, 4rem); align-items: center;
}
.ph-hero__eyebrow {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-size: 0.82rem; letter-spacing: 0.08em; text-transform: uppercase;
  color: color-mix(in oklab, var(--accent-color), white 36%);
  background: color-mix(in oklab, var(--accent-color), transparent 82%);
  border: 1px solid color-mix(in oklab, var(--accent-color), transparent 54%);
  padding: 0.4rem 0.75rem; border-radius: 999px;
  box-shadow: 0 0 30px color-mix(in oklab, var(--accent-color), transparent 86%);
}
.ph-hero__title {
  margin: 1.2rem 0; font-size: clamp(2.2rem, 5.4vw, 4.6rem);
  line-height: 1.0; letter-spacing: -0.04em; max-width: 14ch; font-weight: 800;
}
.ph-hero__subtitle {
  margin: 1.1rem 0; color: var(--text-secondary);
  font-size: clamp(1rem, 1.4vw, 1.15rem); max-width: 56ch;
}
.ph-hero__ctas { display: flex; gap: 0.85rem; flex-wrap: wrap; margin: 1.75rem 0 1.1rem; }
.ph-hero__stats { margin-top: 1.1rem; display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 0.7rem; }
.ph-stat {
  display: flex; align-items: center; gap: 0.7rem;
  background: color-mix(in oklab, var(--accent-color), transparent 94%);
  border: 1px solid color-mix(in oklab, var(--accent-color), transparent 75%);
  border-radius: 12px; padding: 0.8rem 1rem;
}
.ph-stat__value { display: block; color: var(--text-muted); font-size: 0.85rem; }
.ph-stat__label { display: block; font-weight: 700; font-variant-numeric: tabular-nums; font-size: 1.15rem; }

/* Hero preview panel (animated) */
.ph-hero-preview {
  position: relative; min-height: 440px; border-radius: 26px;
  border: 1px solid color-mix(in oklab, var(--accent-color), transparent 62%);
  background:
    radial-gradient(circle at 50% 42%, color-mix(in oklab, var(--accent-color), transparent 62%), transparent 18rem),
    linear-gradient(160deg, rgba(10, 18, 33, 0.96), rgba(4, 10, 21, 0.88));
  box-shadow: 0 26px 70px rgba(0, 0, 0, 0.42), 0 0 70px color-mix(in oklab, var(--accent-color), transparent 84%);
  overflow: hidden;
}
html[data-theme="light"] .ph-hero-preview { background: linear-gradient(160deg, #f3f6fb, #e7edf5); }
.ph-hero-preview::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--ph-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--ph-grid) 1px, transparent 1px);
  background-size: 34px 34px;
  mask-image: radial-gradient(circle at center, black, transparent 78%);
  opacity: 0.8;
}
.ph-hero-preview::after {
  content: ""; position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(120deg, transparent 0%, rgba(255, 255, 255, 0.1) 42%, transparent 54%);
  transform: translateX(-130%); animation: ph-preview-shine 5.5s ease-in-out infinite; pointer-events: none;
}
.ph-hero-preview__toolbar {
  position: relative; z-index: 2; display: flex; align-items: center; gap: 0.5rem;
  padding: 1rem 1.15rem; border-bottom: 1px solid color-mix(in oklab, var(--accent-color), transparent 78%);
  background: rgba(255, 255, 255, 0.04);
}
.ph-hero-preview__toolbar span { width: 0.65rem; height: 0.65rem; border-radius: 999px; background: color-mix(in oklab, var(--accent-color), white 28%); opacity: 0.82; }
.ph-hero-preview__toolbar strong { margin-left: 0.4rem; color: var(--text-primary); font-size: 0.82rem; letter-spacing: 0.14em; text-transform: uppercase; }
.ph-hero-preview__stage { position: relative; min-height: 280px; }
.ph-hero-preview__scan { position: absolute; inset: 0; height: 34%; background: linear-gradient(180deg, transparent, color-mix(in oklab, var(--accent-color), transparent 72%), transparent); opacity: 0.48; animation: ph-scan 4.8s ease-in-out infinite; }
.ph-hero-preview__orbit {
  position: absolute; inset: 50%; border: 1px solid color-mix(in oklab, var(--accent-color), transparent 48%);
  border-radius: 999px; transform: translate(-50%, -50%) rotate(-18deg);
}
.ph-orbit--outer { width: 270px; height: 160px; box-shadow: 0 0 28px color-mix(in oklab, var(--accent-color), transparent 86%); animation: ph-orbit-outer 8s linear infinite; }
.ph-orbit--inner { width: 190px; height: 190px; transform: translate(-50%, -50%) rotate(58deg); opacity: 0.65; animation: ph-orbit-inner 6.5s linear infinite reverse; }
.ph-orbit--tilt { width: 235px; height: 118px; opacity: 0.55; transform: translate(-50%, -50%) rotate(118deg); animation: ph-orbit-tilt 7.5s linear infinite; }
.ph-hero-preview__mass { position: absolute; border-radius: 999px; background: var(--accent-color); box-shadow: 0 0 22px var(--accent-color), 0 0 54px color-mix(in oklab, var(--accent-color), transparent 45%); }
.ph-mass--primary { width: 1.2rem; height: 1.2rem; top: 36%; right: 24%; animation: ph-float-primary 3.6s ease-in-out infinite; }
.ph-mass--secondary { width: 0.8rem; height: 0.8rem; left: 27%; bottom: 29%; background: #fff; animation: ph-float-secondary 4.2s ease-in-out infinite; }
.ph-mass--tertiary { width: 0.55rem; height: 0.55rem; top: 26%; left: 31%; background: color-mix(in oklab, var(--accent-color), white 38%); animation: ph-float-tertiary 3.2s ease-in-out infinite; }
.ph-hero-preview__atom { position: absolute; inset: 50%; transform: translate(-50%, -50%); color: color-mix(in oklab, var(--accent-color), white 16%); font-size: 4.5rem; filter: drop-shadow(0 0 20px var(--accent-color)); animation: ph-atom-hover 4s ease-in-out infinite; }
.ph-hero-preview__topics { position: relative; z-index: 2; display: flex; flex-wrap: wrap; gap: 0.55rem; padding: 0 1rem 0.8rem; }
.ph-hero-preview__topics a {
  display: inline-flex; align-items: center; min-height: 2rem; padding: 0.35rem 0.7rem; border-radius: 999px;
  color: color-mix(in oklab, var(--accent-color), white 26%); background: color-mix(in oklab, var(--accent-color), transparent 88%);
  border: 1px solid color-mix(in oklab, var(--accent-color), transparent 64%); font-size: 0.78rem; font-weight: 800; letter-spacing: 0.05em;
  transition: transform 0.25s ease, background 0.25s ease;
}
.ph-hero-preview__topics a:hover { transform: translateY(-2px); background: color-mix(in oklab, var(--accent-color), transparent 80%); }

/* ---- FILTER BAR（主仓数据驱动，保留 sticky）---- */
.filter-bar {
  position: sticky; top: 0; z-index: 50;
  padding: 16px 24px;
  background: color-mix(in oklab, var(--bg-color), transparent 12%);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
}
.filter-inner {
  max-width: var(--content-max-width); margin: 0 auto;
  display: flex; gap: 8px; overflow-x: auto; scrollbar-width: none; padding-bottom: 2px;
}
.filter-inner::-webkit-scrollbar { display: none; }
.filter-pill {
  display: flex; align-items: center; gap: 6px; padding: 8px 18px; border-radius: 24px;
  font-size: 0.88rem; font-weight: 500; white-space: nowrap; color: var(--text-secondary);
  border: 1px solid var(--border); background: transparent; transition: all var(--transition-base); flex-shrink: 0;
}
.filter-pill:hover { border-color: var(--border-hover); color: var(--text-primary); background: rgba(48, 54, 61, 0.3); }
.filter-pill.active { color: var(--text-primary); border-color: var(--accent-color); background: color-mix(in oklab, var(--accent-color), transparent 90%); }

/* ---- GALLERY CONTAINER ---- */
.gallery-container { flex: 1; max-width: var(--content-max-width); width: 100%; margin: 0 auto; padding: 32px 24px 64px; }
.sim-list { max-width: var(--content-max-width); margin: 0 auto; padding: 1rem 24px 4rem; }

/* ---- CARD GRID ---- */
.card-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(var(--card-min-width), 1fr)); gap: var(--grid-gap); }

/* ---- SIM CARD（PhysicsHub 标记 + 主仓 4 分类色）---- */
.sim-card {
  display: flex; flex-direction: column; background: var(--card-bg);
  border: 1px solid var(--border); border-radius: var(--border-radius);
  overflow: hidden; transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}
.sim-card:hover { transform: translateY(-4px); border-color: color-mix(in oklab, var(--accent-color), transparent 50%); box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4); }

.sim-card__thumb {
  position: relative; aspect-ratio: 16 / 9; display: grid; place-items: center; font-size: 2.6rem;
  background: linear-gradient(135deg, color-mix(in oklab, var(--accent-color), transparent 80%), var(--bg-surface));
  border-bottom: 1px solid var(--border); overflow: hidden;
}
.sim-card__thumb-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.42; }
.sim-card__thumb::after {
  content: ""; position: absolute; inset: 0;
  background-image: linear-gradient(var(--ph-grid) 1px, transparent 1px), linear-gradient(90deg, var(--ph-grid) 1px, transparent 1px);
  background-size: 26px 26px; mask-image: radial-gradient(circle at center, black, transparent 80%); opacity: 0.5;
}
.card-thumb-icon { position: relative; z-index: 2; font-size: 3rem; opacity: 0.85; filter: drop-shadow(0 0 12px rgba(0, 0, 0, 0.4)); }

.sim-card__body { padding: 1.1rem 1.2rem 1.3rem; display: flex; flex-direction: column; gap: 0.6rem; flex: 1; }
.sim-card__title { font-size: 1.12rem; font-weight: 700; color: var(--text-primary); }
.sim-card__title:hover { color: var(--accent-color); }
.sim-card__desc { font-size: 0.88rem; color: var(--text-muted); flex: 1; line-height: 1.55;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.sim-card__meta { display: flex; flex-wrap: wrap; gap: 0.4rem; align-items: center; }

.tag {
  display: inline-flex; align-items: center; padding: 0.25rem 0.6rem; border-radius: 999px;
  font-size: 0.72rem; font-weight: 700; letter-spacing: 0.02em;
  background: rgba(255, 255, 255, 0.06); color: var(--text-secondary); border: 1px solid var(--border);
}
.tag--cat { background: rgba(255, 255, 255, 0.04); color: var(--text-secondary); text-transform: none; letter-spacing: 0; }
.tag--easy { background: rgba(16, 185, 129, 0.12); color: #10b981; border-color: transparent; }
.tag--medium { background: rgba(245, 158, 11, 0.12); color: #f59e0b; border-color: transparent; }
.tag--advanced { background: rgba(59, 130, 246, 0.12); color: #3b82f6; border-color: transparent; }
.sim-card__run { margin-top: 0.4rem; align-self: flex-start; }

/* 分类强调色（hover 光晕 + 徽标） */
.sim-card[data-category="antenna"]:hover { border-color: rgba(0, 255, 102, 0.5); box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(0, 255, 102, 0.12); }
.sim-card[data-category="field-kinematics"]:hover { border-color: rgba(0, 242, 254, 0.5); box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(0, 242, 254, 0.12); }
.sim-card[data-category="mechanics"]:hover { border-color: rgba(255, 102, 0, 0.5); box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(255, 102, 0, 0.12); }
.sim-card[data-category="circuit"]:hover { border-color: rgba(188, 140, 255, 0.5); box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4), 0 0 24px rgba(188, 140, 255, 0.12); }
.sim-card[data-category="antenna"] .tag--cat { background: rgba(0, 255, 102, 0.15); color: var(--accent-green); border-color: rgba(0, 255, 102, 0.25); }
.sim-card[data-category="field-kinematics"] .tag--cat { background: rgba(0, 242, 254, 0.15); color: var(--accent-cyan); border-color: rgba(0, 242, 254, 0.25); }
.sim-card[data-category="mechanics"] .tag--cat { background: rgba(255, 102, 0, 0.15); color: var(--accent-orange); border-color: rgba(255, 102, 0, 0.25); }
.sim-card[data-category="circuit"] .tag--cat { background: rgba(188, 140, 255, 0.15); color: var(--accent-purple); border-color: rgba(188, 140, 255, 0.25); }

/* ---- SKELETON / EMPTY / ERROR（主仓）---- */
.skeleton-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--border-radius); overflow: hidden; }
.skeleton-card::before {
  content: ""; display: block; aspect-ratio: 16 / 9;
  background: linear-gradient(90deg, rgba(48, 54, 61, 0.3) 25%, rgba(48, 54, 61, 0.6) 50%, rgba(48, 54, 61, 0.3) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s ease-in-out infinite;
}
.skeleton-card::after {
  content: ""; display: block; height: 80px; margin: 16px; border-radius: var(--radius-sm);
  background: linear-gradient(90deg, rgba(48, 54, 61, 0.3) 25%, rgba(48, 54, 61, 0.5) 50%, rgba(48, 54, 61, 0.3) 75%);
  background-size: 200% 100%; animation: shimmer 1.5s ease-in-out infinite;
}
@keyframes shimmer { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

.empty-state { text-align: center; padding: 80px 24px; color: var(--text-secondary); }
.empty-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.6; }
.empty-title { font-size: 1.2rem; font-weight: 600; color: var(--text-primary); margin-bottom: 8px; }
.empty-desc { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 20px; }
.retry-btn {
  display: inline-flex; align-items: center; gap: 6px; padding: 10px 24px; border-radius: 24px;
  font-size: 0.9rem; font-weight: 500; color: var(--accent-color); border: 1px solid color-mix(in oklab, var(--accent-color), transparent 70%);
  background: color-mix(in oklab, var(--accent-color), transparent 95%); transition: all var(--transition-base);
}
.retry-btn:hover { background: color-mix(in oklab, var(--accent-color), transparent 88%); }

/* ---- FOOTER（PhysicsHub）---- */
.site-footer { border-top: 1px solid var(--border); padding: 3rem 2rem 2rem; margin-top: 3rem; color: var(--text-tertiary); font-size: 0.82rem; }
.footer-inner { max-width: var(--content-max-width); margin: auto; display: flex; flex-wrap: wrap; gap: 2rem; justify-content: space-between; align-items: center; }
.footer-brand { font-weight: 800; font-size: 1.05rem; color: var(--text-primary); }
.footer-brand b { color: var(--accent-color); }
.footer-links { display: flex; flex-wrap: wrap; gap: 1.4rem; }
.footer-links a { color: var(--footer-link-color); opacity: 0.75; transition: opacity 0.2s; }
.footer-links a:hover { opacity: 1; color: var(--accent-color); }
.footer-note { width: 100%; text-align: center; color: var(--text-tertiary); font-size: 0.8rem; margin-top: 1.5rem; }

/* ---- 通用内容页（about / contribute / simulations 列表）---- */
.page-hero { max-width: 820px; margin: 0 auto; padding: 5rem 1.5rem 2rem; text-align: center; }
.page-hero h1 { font-size: clamp(2rem, 5vw, 3rem); font-weight: 800; letter-spacing: -0.03em; }
.page-hero p { max-width: 680px; margin: 1rem auto 0; font-size: 1.05rem; color: var(--text-secondary); line-height: 1.7; }
.page-hero p code { font-family: var(--font-mono); background: rgba(255, 255, 255, 0.06); padding: 0.1rem 0.4rem; border-radius: 6px; color: var(--accent-color); }

/* ---- RESPONSIVE ---- */
@media (max-width: 960px) {
  .ph-hero__container--landing { grid-template-columns: 1fr; }
  .ph-hero-preview { min-height: 360px; }
}
@media (max-width: 840px) {
  .menu-toggle { display: block; }
  nav { position: fixed; top: 0; right: 0; height: 100vh; width: min(86vw, 360px); display: block; overflow-y: auto; transform: translateX(100%); transition: transform 0.35s ease; z-index: 200; background: var(--bg-surface); border-left: 1px solid var(--border); padding-top: 5rem; }
  .site-header.open nav { transform: translateX(0); }
  nav ul { flex-direction: column; gap: 1rem; padding: 1.5rem; }
  .nav-underline { display: none; }
}
@media (max-width: 640px) {
  .gallery-container { padding: 20px 12px 40px; }
  .card-grid { grid-template-columns: 1fr; }
  .filter-bar { padding: 12px 12px; }
  .filter-pill { padding: 6px 14px; font-size: 0.8rem; }
}
@media (min-width: 640px) and (max-width: 899px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) and (max-width: 1199px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1200px) { .card-grid { grid-template-columns: repeat(4, 1fr); } }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
  .ph-hero-preview::after, .ph-hero-preview__scan, .ph-orbit--outer, .ph-orbit--inner, .ph-orbit--tilt,
  .ph-mass--primary, .ph-mass--secondary, .ph-mass--tertiary, .ph-hero-preview__atom { animation: none; }
}
:focus-visible { outline: 2px solid var(--accent-color); outline-offset: 2px; }

/* ---- KEYFRAMES ---- */
@keyframes ph-preview-shine { 0%, 42% { transform: translateX(-130%); } 58%, 100% { transform: translateX(130%); } }
@keyframes ph-scan { 0%, 100% { transform: translateY(-40%); } 50% { transform: translateY(210%); } }
@keyframes ph-orbit-outer { to { transform: translate(-50%, -50%) rotate(342deg); } }
@keyframes ph-orbit-inner { to { transform: translate(-50%, -50%) rotate(418deg); } }
@keyframes ph-orbit-tilt { to { transform: translate(-50%, -50%) rotate(478deg); } }
@keyframes ph-float-primary { 50% { transform: translate(-18px, 12px) scale(1.12); } }
@keyframes ph-float-secondary { 50% { transform: translate(20px, -16px) scale(1.1); } }
@keyframes ph-float-tertiary { 50% { transform: translate(14px, 18px) scale(1.25); } }
@keyframes ph-atom-hover { 50% { transform: translate(-50%, -54%) scale(1.06); filter: drop-shadow(0 0 32px var(--accent-color)); } }

@media print { .filter-bar, .site-footer { display: none !important; } }