/* ============================================================
   释风群体 · 官网样式
   主题：风 · 游戏 · 极客浪漫 · 浅色
   ============================================================ */

:root {
  /* 浅色配色 */
  --bg-0: #f8f9fc;
  --bg-1: #eef1f7;
  --bg-2: #e3e7f0;
  --surface: rgba(0, 0, 0, 0.03);
  --surface-2: rgba(0, 0, 0, 0.06);
  --border: rgba(0, 0, 0, 0.07);
  --border-strong: rgba(0, 0, 0, 0.13);

  --text: #1a1d2e;
  --text-soft: #555978;
  --text-mute: #8b8fa8;

  --cyan: #0ea5e9;
  --blue: #3b82f6;
  --indigo: #6366f1;
  --violet: #8b5cf6;
  --teal: #14b8a6;
  --amber: #f59e0b;

  --accent: var(--cyan);
  --accent-2: var(--blue);
  --grad-accent: linear-gradient(120deg, #0ea5e9 0%, #3b82f6 50%, #8b5cf6 100%);
  --grad-text: linear-gradient(120deg, #0284c7 0%, #2563eb 45%, #7c3aed 100%);

  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 28px;

  --shadow-glow: 0 0 60px rgba(14, 165, 233, 0.15);
  --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --maxw: 1200px;
  --nav-h: 72px;
}

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

html { scroll-behavior: smooth; scroll-padding-top: var(--nav-h); }

body {
  font-family: "Noto Sans SC", "Sora", system-ui, -apple-system, sans-serif;
  background: var(--bg-0);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* 背景渐变层 */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 600px at 12% -5%, rgba(14, 165, 233, 0.09), transparent 60%),
    radial-gradient(800px 600px at 95% 8%, rgba(99, 102, 241, 0.08), transparent 60%),
    radial-gradient(700px 700px at 50% 110%, rgba(20, 184, 166, 0.06), transparent 60%),
    linear-gradient(180deg, #f0f2f8 0%, var(--bg-0) 30%, var(--bg-1) 70%, var(--bg-0) 100%);
}

/* ---------- 风 画布 ---------- */
.wind-canvas {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.35;
}

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0%;
  z-index: 1000;
  background: var(--grad-accent);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.7);
  transition: width 0.1s linear;
}

/* ---------- 导航 ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-h);
  z-index: 900;
  transition: background 0.4s var(--ease), backdrop-filter 0.4s, border-color 0.4s, box-shadow 0.4s;
  border-bottom: 1px solid transparent;
}
.navbar.scrolled {
  background: rgba(248, 249, 252, 0.78);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  border-bottom-color: var(--border);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
}
.nav-inner {
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-logo {
  width: 40px; height: 40px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.brand-text {
  font-family: "Noto Serif SC", serif;
  font-weight: 900;
  font-size: 22px;
  letter-spacing: 2px;
  display: flex;
  align-items: baseline;
  gap: 2px;
}
.brand-dot { color: var(--cyan); margin: 0 4px; }
.brand-en {
  font-family: "Sora", sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  color: var(--text-mute);
  align-self: center;
  margin-left: 4px;
}
.nav-menu { display: flex; align-items: center; gap: 22px; }
.nav-links { display: flex; gap: 6px; }
.nav-link {
  position: relative;
  padding: 8px 14px;
  font-size: 15px;
  color: var(--text-soft);
  border-radius: 10px;
  transition: color 0.25s, background 0.25s;
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 14px; right: 14px; bottom: 4px;
  height: 2px;
  background: var(--grad-accent);
  border-radius: 2px;
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: var(--text); }
.nav-link.active::after { transform: scaleX(1); }
.nav-cta {
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  background: var(--grad-accent);
  border-radius: 999px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s;
  box-shadow: 0 4px 14px rgba(14, 165, 233, 0.3);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 22px rgba(14, 165, 233, 0.45); }

.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 6px; }
.nav-toggle span {
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 26px;
  font-size: 15px;
  font-weight: 600;
  border-radius: 999px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s, background 0.25s, border-color 0.25s;
  cursor: pointer;
}
.btn-primary {
  color: #fff;
  background: var(--grad-accent);
  box-shadow: 0 4px 16px rgba(14, 165, 233, 0.28);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 10px 28px rgba(14, 165, 233, 0.42); }
.btn-ghost {
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(6px);
}
.btn-ghost:hover { background: var(--surface-2); transform: translateY(-3px); border-color: var(--cyan); }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: calc(var(--nav-h) + 40px) 24px 60px;
  overflow: hidden;
}
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, #000 30%, transparent 80%);
  z-index: 0;
}
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.5;
  z-index: 0;
  animation: float 14s ease-in-out infinite;
}
.hero-orb--1 { width: 480px; height: 480px; background: radial-gradient(circle, rgba(14,165,233,0.3), transparent 70%); top: -120px; left: -80px; }
.hero-orb--2 { width: 520px; height: 520px; background: radial-gradient(circle, rgba(99,102,241,0.25), transparent 70%); bottom: -160px; right: -100px; animation-delay: -4s; }
.hero-orb--3 { width: 360px; height: 360px; background: radial-gradient(circle, rgba(20,184,166,0.2), transparent 70%); top: 40%; left: 45%; animation-delay: -8s; }

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(40px, -30px) scale(1.08); }
  66% { transform: translate(-30px, 25px) scale(0.95); }
}

.hero-content { position: relative; z-index: 2; width: 100%; max-width: var(--maxw); margin: 0 auto; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--border);
  border-radius: 999px;
  backdrop-filter: blur(8px);
  box-shadow: 0 1px 4px rgba(0,0,0,0.04);
  margin-bottom: 32px;
}
.pulse-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.7);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0.6); }
  70% { box-shadow: 0 0 0 10px rgba(34, 211, 238, 0); }
  100% { box-shadow: 0 0 0 0 rgba(34, 211, 238, 0); }
}

.hero-main {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  align-items: center;
  gap: 40px;
  margin-bottom: 56px;
}

.hero-title { font-family: "Noto Serif SC", serif; line-height: 1; margin-bottom: 18px; }
.hero-zh {
  font-size: clamp(80px, 16vw, 200px);
  font-weight: 900;
  letter-spacing: 8px;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 4px 24px rgba(14, 165, 233, 0.18));
}
.hero-zh .accent {
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 6px 30px rgba(14, 165, 233, 0.2));
}
.hero-slogan {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(20px, 3vw, 30px);
  font-weight: 500;
  letter-spacing: 6px;
  color: var(--text);
  margin-bottom: 22px;
}
.hero-desc {
  font-size: 16px;
  color: var(--text-soft);
  max-width: 560px;
  margin-bottom: 36px;
}
.hero-desc strong { color: var(--text); font-weight: 600; }

.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero Logo */
.hero-logo {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-self: center;
}
.logo-ring, .logo-ring--2 {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--border-strong);
  top: 50%; left: 50%;
}
.logo-ring { width: 360px; height: 360px; transform: translate(-50%, -56%); animation: spin 30s linear infinite; }
.logo-ring--2 { width: 300px; height: 300px; transform: translate(-50%, -56%); border-style: dashed; border-color: rgba(34,211,238,0.25); animation: spin 22s linear infinite reverse; }
@keyframes spin { to { transform: translate(-50%, -56%) rotate(360deg); } }

.logo-disc {
  position: relative;
  width: 240px; height: 240px;
  border-radius: 50%;
  padding: 4px;
  background: conic-gradient(from 0deg, #0ea5e9, #3b82f6, #8b5cf6, #0ea5e9);
  box-shadow: var(--shadow-glow), 0 12px 40px rgba(14,165,233,0.15);
  animation: bob 6s ease-in-out infinite;
}
.logo-disc img {
  width: 100%; height: 100%;
  border-radius: 50%;
  object-fit: cover;
  background: #eef1f7;
}
@keyframes bob { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
.logo-tags {
  position: absolute;
  bottom: -10px;
  display: flex;
  gap: 10px;
}
.logo-tags span {
  font-family: "Sora", sans-serif;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  color: var(--text-mute);
  padding: 5px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  backdrop-filter: blur(6px);
}

/* Hero stats */
.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  padding: 28px;
  background: rgba(255,255,255,0.65);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
}
.stat { text-align: center; position: relative; }
.stat:not(:last-child)::after {
  content: "";
  position: absolute;
  right: -8px; top: 20%; bottom: 20%;
  width: 1px;
  background: var(--border);
}
.stat-num {
  font-family: "Sora", sans-serif;
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline;
}
.stat-suffix {
  font-family: "Sora", sans-serif;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  color: var(--cyan);
}
.stat-label {
  display: block;
  font-size: 13px;
  color: var(--text-mute);
  margin-top: 6px;
  letter-spacing: 1px;
}

/* scroll cue */
.scroll-cue {
  position: absolute;
  bottom: 26px; left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  z-index: 2;
  opacity: 0.7;
  transition: opacity 0.3s;
}
.scroll-cue:hover { opacity: 1; }
.mouse {
  width: 24px; height: 40px;
  border: 2px solid var(--text-soft);
  border-radius: 14px;
  display: flex;
  justify-content: center;
  padding-top: 7px;
}
.wheel {
  width: 4px; height: 8px;
  background: var(--cyan);
  border-radius: 2px;
  animation: wheel 1.8s infinite;
}
@keyframes wheel { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(12px); } }
.scroll-text { font-family: "Sora", sans-serif; font-size: 10px; letter-spacing: 3px; color: var(--text-mute); }

/* ---------- 通用 Section ---------- */
.section { padding: 120px 0; position: relative; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 64px; }
.section-tag {
  display: inline-block;
  font-family: "Sora", sans-serif;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 4px;
  color: var(--cyan);
  padding: 6px 16px;
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.2);
  border-radius: 999px;
  margin-bottom: 20px;
}
.section-title {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(32px, 5vw, 52px);
  font-weight: 900;
  letter-spacing: 4px;
  margin-bottom: 16px;
  color: var(--text);
}
.section-sub { font-size: 16px; color: var(--text-soft); }

.placeholder-note {
  display: inline;
  font-size: 13px;
  color: var(--text-mute);
  font-style: italic;
  opacity: 0.85;
}

/* ---------- 团队介绍 ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 56px;
  align-items: start;
}
.about-text p { margin-bottom: 20px; color: var(--text-soft); }
.about-lead {
  font-size: 19px !important;
  line-height: 1.8;
  color: var(--text) !important;
  font-weight: 400;
}
.about-values {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.value-card {
  padding: 28px 24px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: transform 0.35s var(--ease), border-color 0.35s, background 0.35s, box-shadow 0.35s;
  position: relative;
  overflow: hidden;
}
.value-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(14,165,233,0.06), transparent 60%);
  opacity: 0;
  transition: opacity 0.35s;
}
.value-card:hover { transform: translateY(-6px); border-color: var(--cyan); background: rgba(255,255,255,0.95); box-shadow: var(--shadow-card); }
.value-card:hover::before { opacity: 1; }
.value-icon {
  width: 48px; height: 48px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: rgba(14, 165, 233, 0.1);
  color: var(--cyan);
  margin-bottom: 16px;
  position: relative;
  z-index: 1;
}
.value-icon svg { width: 26px; height: 26px; }
.value-card h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 22px;
  font-weight: 700;
  margin-bottom: 8px;
  position: relative; z-index: 1;
}
.value-card p { font-size: 14px; color: var(--text-soft); position: relative; z-index: 1; }

/* ---------- 业务领域 ---------- */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.biz-card {
  position: relative;
  padding: 36px 32px 32px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform 0.4s var(--ease), border-color 0.4s, box-shadow 0.4s;
}
.biz-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--c1), var(--c2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s var(--ease);
}
.biz-card::after {
  content: "";
  position: absolute;
  width: 260px; height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--c1), transparent 70%);
  opacity: 0;
  top: -80px; right: -80px;
  filter: blur(40px);
  transition: opacity 0.5s;
}
.biz-card:hover { transform: translateY(-8px); border-color: var(--cyan); box-shadow: var(--shadow-card); }
.biz-card:hover::before { transform: scaleX(1); }
.biz-card:hover::after { opacity: 0.12; }
.biz-num {
  position: absolute;
  top: 26px; right: 30px;
  font-family: "Sora", sans-serif;
  font-size: 64px;
  font-weight: 700;
  color: rgba(0,0,0,0.03);
  line-height: 1;
}
.biz-icon {
  width: 58px; height: 58px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  color: #fff;
  margin-bottom: 22px;
  box-shadow: 0 6px 18px rgba(0,0,0,0.12);
}
.biz-icon svg { width: 30px; height: 30px; }
.biz-card h3 {
  font-family: "Noto Serif SC", serif;
  font-size: 26px;
  font-weight: 700;
  margin-bottom: 12px;
  letter-spacing: 2px;
}
.biz-card > p { color: var(--text-soft); font-size: 15px; margin-bottom: 22px; }
.biz-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.biz-tags li {
  font-size: 12px;
  color: var(--text-soft);
  padding: 5px 12px;
  background: rgba(255,255,255,0.5);
  border: 1px solid var(--border);
  border-radius: 999px;
  transition: color 0.25s, border-color 0.25s, background 0.25s;
}
.biz-card:hover .biz-tags li { border-color: rgba(14,165,233,0.25); background: rgba(14,165,233,0.05); }

/* ---------- 发展历程 Timeline ---------- */
.timeline { position: relative; padding: 20px 0; }
.timeline-line {
  position: absolute;
  left: 50%; top: 0; bottom: 0;
  width: 2px;
  background: var(--border);
  transform: translateX(-50%);
}
.timeline-line-fill {
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 0%;
  background: var(--grad-accent);
  box-shadow: 0 0 12px rgba(34, 211, 238, 0.6);
  transition: height 0.2s linear;
}
.tl-item {
  position: relative;
  width: 50%;
  padding: 0 48px 48px 0;
  text-align: right;
}
.tl-item.tl-right {
  margin-left: 50%;
  padding: 0 0 48px 48px;
  text-align: left;
}
.tl-marker {
  position: absolute;
  top: 6px;
  right: -14px;
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--bg-1);
  border: 2px solid var(--cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  box-shadow: 0 0 0 6px rgba(34,211,238,0.08);
}
.tl-marker span {
  position: absolute;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
}
.tl-item.tl-right .tl-marker { right: auto; left: -14px; }
.tl-marker--now {
  border-color: var(--amber);
  box-shadow: 0 0 0 6px rgba(251,191,36,0.12), 0 0 20px rgba(251,191,36,0.5);
  animation: pulseNow 2.4s infinite;
}
.tl-marker--now span { background: var(--amber); box-shadow: 0 0 12px var(--amber); }
@keyframes pulseNow {
  0%,100% { box-shadow: 0 0 0 6px rgba(251,191,36,0.12), 0 0 20px rgba(251,191,36,0.5); }
  50% { box-shadow: 0 0 0 12px rgba(251,191,36,0.04), 0 0 30px rgba(251,191,36,0.7); }
}

.tl-card {
  display: inline-block;
  padding: 24px 26px;
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 420px;
  transition: transform 0.35s var(--ease), border-color 0.35s, background 0.35s, box-shadow 0.35s;
  position: relative;
}
.tl-card:hover { transform: translateY(-4px); border-color: var(--cyan); background: rgba(255,255,255,0.95); box-shadow: var(--shadow-card); }
.tl-year {
  font-family: "Sora", sans-serif;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--cyan);
  margin-bottom: 6px;
}
.tl-title {
  font-family: "Noto Serif SC", serif;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
}
.tl-card p { font-size: 14px; color: var(--text-soft); }
.tl-card--now {
  border-color: rgba(245,158,11,0.35);
  background: linear-gradient(135deg, rgba(245,158,11,0.06), rgba(255,255,255,0.7));
}
.tl-card--now .tl-year { color: var(--amber); }

/* ---------- 加入我们 ---------- */
.join { padding-top: 60px; }
.join-card {
  position: relative;
  padding: 72px 48px;
  border-radius: var(--radius-lg);
  background:
    linear-gradient(135deg, rgba(14,165,233,0.06), rgba(99,102,241,0.05)),
    rgba(255,255,255,0.7);
  border: 1px solid var(--border);
  text-align: center;
  overflow: hidden;
  box-shadow: var(--shadow-card);
}
.join-glow {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(14,165,233,0.12), transparent 65%);
  top: -300px; left: 50%;
  transform: translateX(-50%);
  filter: blur(30px);
}
.join-content { position: relative; z-index: 1; }
.join-title {
  font-family: "Noto Serif SC", serif;
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 900;
  letter-spacing: 3px;
  margin: 18px 0 18px;
  background: var(--grad-text);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.join-desc { color: var(--text-soft); font-size: 16px; margin-bottom: 34px; }
.join-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- 页脚 ---------- */
.footer {
  border-top: 1px solid var(--border);
  background: rgba(238, 241, 247, 0.7);
  padding: 56px 0 36px;
  backdrop-filter: blur(10px);
}
.footer-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.4fr;
  gap: 40px;
  align-items: start;
}
.footer-brand { display: flex; align-items: center; gap: 14px; }
.footer-logo { width: 48px; height: 48px; border-radius: 50%; object-fit: cover; box-shadow: 0 2px 8px rgba(0,0,0,0.08); }
.footer-name { font-family: "Noto Serif SC", serif; font-weight: 900; font-size: 18px; letter-spacing: 2px; }
.footer-slogan { font-size: 13px; color: var(--text-mute); margin-top: 2px; }
.footer-nav { display: flex; flex-direction: column; gap: 12px; }
.footer-nav a { color: var(--text-soft); font-size: 14px; transition: color 0.25s, padding-left 0.25s; width: fit-content; }
.footer-nav a:hover { color: var(--cyan); padding-left: 6px; }
.footer-areas { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 18px; }
.footer-areas span {
  font-size: 12px;
  color: var(--text-soft);
  padding: 5px 12px;
  background: rgba(255,255,255,0.5);
  border: 1px solid var(--border);
  border-radius: 999px;
}
.footer-copy { font-size: 12px; color: var(--text-mute); }

/* ---------- 滚动出现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
  transition-delay: calc(var(--d, 0) * 0.08s);
}
.reveal.in { opacity: 1; transform: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .hero-main { grid-template-columns: 1fr; gap: 48px; text-align: center; }
  .hero-text { display: flex; flex-direction: column; align-items: center; }
  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-stats { grid-template-columns: repeat(2, 1fr); gap: 24px 16px; }
  .stat:nth-child(2)::after { display: none; }
  .about-grid { grid-template-columns: 1fr; gap: 36px; }
  .biz-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 28px; }

  /* timeline 转为单侧 */
  .timeline-line { left: 16px; }
  .tl-item, .tl-item.tl-right {
    width: 100%;
    margin-left: 0;
    padding: 0 0 36px 48px;
    text-align: left;
  }
  .tl-item .tl-card, .tl-item.tl-right .tl-card { text-align: left; }
  .tl-marker, .tl-item.tl-right .tl-marker { left: 2px; right: auto; }
}

@media (max-width: 720px) {
  .nav-menu {
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    background: rgba(248, 249, 252, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 18px 24px 24px;
    border-bottom: 1px solid var(--border);
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    transform: translateY(-130%);
    transition: transform 0.4s var(--ease);
  }
  .nav-menu.open { transform: translateY(0); }
  .nav-links { flex-direction: column; gap: 2px; }
  .nav-cta { text-align: center; margin-top: 6px; }
  .nav-toggle { display: flex; z-index: 950; }
  .nav-link { padding: 12px 14px; }
  .nav-link::after { display: none; }

  .section { padding: 80px 0; }
  .section-head { margin-bottom: 44px; }
  .about-values { grid-template-columns: 1fr; }
  .biz-card { padding: 28px 22px; }
  .logo-disc { width: 180px; height: 180px; }
  .logo-ring { width: 270px; height: 270px; }
  .logo-ring--2 { width: 220px; height: 220px; }
  .hero-stats { padding: 22px 16px; }
  .join-card { padding: 48px 22px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
}