/* ============================================================
   SailorCai · 个人品牌站
   极简 · Linear / Apple 风格
   ============================================================ */

/* ---------- 主题变量 ---------- */
:root {
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI",
          "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --max-w: 1080px;
  --radius: 18px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --accent-1: #38bdf8;
  --accent-2: #818cf8;
  --accent-3: #c084fc;
}

[data-theme="dark"] {
  --bg: #050507;
  --bg-soft: #0b0b10;
  --card: rgba(255, 255, 255, 0.03);
  --card-hover: rgba(255, 255, 255, 0.06);
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #f5f5f7;
  --text-muted: #9ba1ab;
  --nav-bg: rgba(5, 5, 7, 0.72);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  --glow-opacity: 0.5;
}

[data-theme="light"] {
  --bg: #ffffff;
  --bg-soft: #f7f7f9;
  --card: rgba(0, 0, 0, 0.025);
  --card-hover: rgba(0, 0, 0, 0.05);
  --border: rgba(0, 0, 0, 0.08);
  --border-strong: rgba(0, 0, 0, 0.16);
  --text: #1d1d1f;
  --text-muted: #6e6e73;
  --nav-bg: rgba(255, 255, 255, 0.75);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.08);
  --glow-opacity: 0.28;
}

/* ---------- 基础 ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.4s var(--ease), color 0.4s var(--ease);
  overflow-x: hidden;
}

::selection { background: rgba(129, 140, 248, 0.35); }

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

/* 噪点纹理 */
.grain {
  position: fixed;
  inset: 0;
  z-index: 60;
  pointer-events: none;
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- 导航 ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 22px 32px;
  transition: all 0.35s var(--ease);
}

.nav.scrolled {
  background: var(--nav-bg);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom: 1px solid var(--border);
  padding: 14px 32px;
}

.logo {
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.logo .dot { color: var(--accent-2); }

.nav-links { display: flex; gap: 6px; }

.nav-links a {
  padding: 8px 14px;
  font-size: 0.92rem;
  color: var(--text-muted);
  border-radius: 999px;
  transition: color 0.25s, background 0.25s;
}
.nav-links a:hover { color: var(--text); background: var(--card); }

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text-muted);
  cursor: pointer;
  transition: all 0.3s var(--ease);
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); transform: translateY(-1px); }
.theme-toggle svg { width: 18px; height: 18px; grid-area: 1 / 1; transition: opacity 0.3s, transform 0.45s var(--ease); }
.icon-moon { opacity: 0; transform: rotate(90deg) scale(0.6); }
[data-theme="dark"] .icon-sun { opacity: 0; transform: rotate(-90deg) scale(0.6); }
[data-theme="dark"] .icon-moon { opacity: 1; transform: rotate(0) scale(1); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: center;
  padding: 140px 32px 90px;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 860px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-glow {
  position: absolute;
  top: 6%;
  left: 50%;
  transform: translateX(-50%);
  width: min(900px, 120vw);
  height: 480px;
  background:
    radial-gradient(45% 55% at 32% 45%, rgba(56, 189, 248, var(--glow-opacity)), transparent 70%),
    radial-gradient(45% 55% at 68% 45%, rgba(192, 132, 252, var(--glow-opacity)), transparent 70%);
  filter: blur(60px);
  opacity: 0.55;
  pointer-events: none;
}

.eyebrow {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 26px;
  padding: 8px 18px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
}

.hero h1 {
  font-size: clamp(3.1rem, 9vw, 6.4rem);
  font-weight: 800;
  letter-spacing: -0.045em;
  line-height: 1.04;
  margin-bottom: 28px;
}

.gradient {
  background: linear-gradient(100deg, var(--accent-1) 0%, var(--accent-2) 50%, var(--accent-3) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% 100%;
  animation: gradient-shift 8s ease infinite;
}
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
}

.lead {
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  color: var(--text-muted);
  max-width: 620px;
  margin-bottom: 42px;
}

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; justify-content: center; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.3s var(--ease);
}
.btn:active { transform: scale(0.97); }

.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--accent-1), var(--accent-2) 55%, var(--accent-3));
  box-shadow: 0 8px 24px rgba(99, 102, 241, 0.35);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 34px rgba(99, 102, 241, 0.45); }

.btn-ghost {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--card);
}
.btn-ghost:hover { background: var(--card-hover); transform: translateY(-2px); }

.hero-stats {
  display: flex;
  align-items: center;
  gap: 22px;
  margin-top: 56px;
  color: var(--text-muted);
  font-size: 0.9rem;
}
.hero-stats strong { color: var(--text); font-weight: 700; font-size: 1.05rem; margin-right: 4px; }
.hero-stats i { width: 4px; height: 4px; border-radius: 50%; background: var(--border-strong); }

/* ---------- Section 通用 ---------- */
.section {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 110px 32px;
}

.section-head {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 34px;
}
.index {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-2);
}
.section-head h2 {
  font-size: clamp(1.9rem, 4.5vw, 2.8rem);
  font-weight: 750;
  letter-spacing: -0.03em;
}

.prose {
  max-width: 640px;
  font-size: 1.08rem;
  color: var(--text-muted);
}
.prose strong { color: var(--text); font-weight: 600; }

/* 关键词 chips */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 30px;
  list-style: none;
}
.chips li {
  padding: 9px 18px;
  font-size: 0.9rem;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  transition: all 0.3s var(--ease);
}
.chips li:hover {
  border-color: var(--border-strong);
  background: var(--card-hover);
  transform: translateY(-2px);
}

/* ---------- 产品卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 22px;
}

.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  overflow: hidden;
  transition: all 0.4s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  background: var(--card-hover);
  box-shadow: var(--shadow);
}

.card-media {
  position: relative;
  display: flex;
  height: 200px;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
  background: var(--bg-soft);
}
.card-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s var(--ease);
}
.card-media--multi img { flex: 1; width: auto; min-width: 0; }
.card:hover .card-media img { transform: scale(1.03); }

.card-logo {
  position: absolute;
  left: 16px;
  bottom: 16px;
  width: 48px;
  height: 48px;
  padding: 3px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--border-strong);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}
.card-logo img { width: 100%; height: 100%; object-fit: contain; border-radius: 8px; }

.card-body {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 22px 24px 24px;
  flex: 1;
}

.card-title-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.card h3 { font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; }
.card-tag {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
  background: var(--card);
}

.card p { font-size: 0.94rem; color: var(--text-muted); flex: 1; }

.card-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent-2);
}
.card-link svg { width: 14px; height: 14px; transition: transform 0.3s var(--ease); }
.card:hover .card-link svg { transform: translate(3px, -1px); }
/* ---------- 社交列表 ---------- */
.follow-intro { margin-bottom: 34px; }

.social-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
}

.social-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 24px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
  transition: all 0.35s var(--ease);
}
.social-item:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  background: var(--card-hover);
  box-shadow: var(--shadow);
}
.social-name {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 600;
}
.social-badge {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-2), var(--accent-3));
}
.social-item .arrow {
  width: 16px;
  height: 16px;
  color: var(--text-muted);
  transition: all 0.3s var(--ease);
}
.social-item:hover .arrow { color: var(--text); transform: translate(3px, -1px); }
.social-badge--icon {
  background: #fff;
  padding: 5px;
}
.social-badge--icon img,
.social-badge--icon svg {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 7px;
}

/* ---------- 页脚 ---------- */
footer {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 40px 32px 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 0.88rem;
}
footer a { transition: color 0.25s; }
footer a:hover { color: var(--text); }

/* ---------- 入场动效 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  transition-delay: calc(var(--d, 0) * 90ms);
}
.reveal.visible { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 640px) {
  .nav { padding: 16px 20px; }
  .nav.scrolled { padding: 12px 20px; }
  .nav-links { display: none; }
  .section { padding: 84px 20px; }
  .hero { padding: 120px 20px 70px; }
  .hide-sm { display: none; }
  footer { justify-content: center; text-align: center; }
}

/* ---------- 无障碍 ---------- */
:focus-visible { outline: 2px solid var(--accent-2); outline-offset: 3px; border-radius: 4px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; }
}