/* ReminderTools - 科技感单页网站样式 */
:root {
  --bg-dark: #05060a;
  --bg-card: #0d0e14;
  --bg-card-hover: #13141f;
  --text-primary: #f5f5f7;
  --text-secondary: #a1a1aa;
  --text-tertiary: #71717a;
  --accent-cyan: #67e8f9;
  --accent-purple: #a78bfa;
  --accent-pink: #f472b6;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.15);
  --glow-cyan: rgba(103,232,249,0.3);
  --glow-purple: rgba(167,139,250,0.3);
  --ease: cubic-bezier(0.4,0,0.2,1);
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  background: var(--bg-dark);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
}

/* 背景动画 */
.bg { position:fixed; inset:0; z-index:0; overflow:hidden; pointer-events:none; }
.bg-grid {
  position:absolute; inset:0;
  background-image: 
    linear-gradient(rgba(103,232,249,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(103,232,249,0.03) 1px, transparent 1px);
  background-size: 50px 50px;
  animation: grid-shift 20s linear infinite;
}
@keyframes grid-shift { to { transform: translate(50px, 50px); } }

.orb { position:absolute; border-radius:50%; filter:blur(90px); opacity:.45; animation: float 18s ease-in-out infinite; }
.orb-1 { width:520px; height:520px; background:var(--glow-cyan); top:-160px; left:-120px; }
.orb-2 { width:460px; height:460px; background:var(--glow-purple); top:30%; right:-160px; animation-delay:-6s; }
.orb-3 { width:380px; height:380px; background:rgba(244,114,182,.18); bottom:-140px; left:30%; animation-delay:-12s; }
@keyframes float { 50% { transform: translate(40px,-30px) scale(1.08); } }

.container { position:relative; z-index:1; width:100%; max-width:1200px; margin:0 auto; padding:0 24px; }
a { color:inherit; text-decoration:none; }
svg { width:1em; height:1em; fill:none; stroke:currentColor; stroke-width:1.8; stroke-linecap:round; stroke-linejoin:round; }

/* 导航 */
.nav { position:fixed; top:0; left:0; right:0; z-index:100; padding:18px 0; transition: all .3s var(--ease); }
.nav.scrolled { padding:12px 0; background:rgba(5,6,10,.72); backdrop-filter:blur(18px); -webkit-backdrop-filter:blur(18px); border-bottom:1px solid var(--border); }
.nav-inner { display:flex; align-items:center; justify-content:space-between; gap:24px; }
.brand { display:flex; align-items:center; gap:10px; font-weight:700; font-size:18px; letter-spacing:-.01em; }
.brand-mark { display:grid; place-items:center; width:34px; height:34px; border-radius:10px; font-size:20px; color:var(--accent-cyan);
  background:linear-gradient(135deg,rgba(103,232,249,.15),rgba(167,139,250,.15)); border:1px solid var(--border-hover); }
.nav-links { display:flex; gap:32px; }
.nav-links a { font-size:14px; color:var(--text-secondary); transition:color .2s; }
.nav-links a:hover { color:var(--text-primary); }
.nav-actions { display:flex; align-items:center; gap:12px; }

/* 语言切换 */
.lang { position:relative; }
.lang-btn { display:flex; align-items:center; gap:8px; padding:8px 14px; font-size:13px; color:var(--text-primary); cursor:pointer;
  background:rgba(255,255,255,.04); border:1px solid var(--border); border-radius:999px; transition:all .2s; font-family:inherit; }
.lang-btn:hover { border-color:var(--border-hover); background:rgba(255,255,255,.08); }
.lang-btn svg { font-size:16px; }
.lang-menu { position:absolute; top:calc(100% + 8px); right:0; min-width:170px; list-style:none; padding:6px;
  background:rgba(13,14,20,.96); backdrop-filter:blur(18px); border:1px solid var(--border-hover); border-radius:14px;
  box-shadow:0 20px 50px rgba(0,0,0,.5); opacity:0; visibility:hidden; transform:translateY(-6px); transition:all .2s var(--ease); }
.lang-menu.show { opacity:1; visibility:visible; transform:none; }
.lang-menu a { display:block; padding:9px 12px; font-size:14px; color:var(--text-secondary); border-radius:8px; transition:all .15s; }
.lang-menu a:hover { background:rgba(255,255,255,.06); color:var(--text-primary); }
.lang-menu a.active { color:var(--accent-cyan); background:rgba(103,232,249,.08); }

.menu-btn { display:none; width:40px; height:40px; flex-direction:column; justify-content:center; align-items:center; gap:6px;
  background:transparent; border:1px solid var(--border); border-radius:10px; cursor:pointer; }
.menu-btn span { display:block; width:18px; height:1.5px; background:var(--text-primary); transition:transform .25s; }
.menu-btn[aria-expanded="true"] span:first-child { transform:translateY(3.75px) rotate(45deg); }
.menu-btn[aria-expanded="true"] span:last-child { transform:translateY(-3.75px) rotate(-45deg); }

/* Hero区 */
.hero { min-height:100vh; display:flex; align-items:center; padding:120px 0 80px; }
.hero .container { display:grid; grid-template-columns:1fr 1fr; gap:64px; align-items:center; }
.badge { display:inline-block; padding:6px 14px; font-size:12px; font-weight:500; letter-spacing:.03em; text-transform:uppercase;
  color:var(--accent-cyan); background:rgba(103,232,249,.12); border:1px solid rgba(103,232,249,.25); border-radius:999px; margin-bottom:24px; }
.hero-title { font-size:clamp(42px,5.5vw,64px); font-weight:800; line-height:1.1; letter-spacing:-.03em; margin-bottom:24px; }
.hero-title-line { display:block; }
.hero-title-accent { background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple)); -webkit-background-clip:text; background-clip:text; -webkit-text-fill-color:transparent; }
.hero-desc { font-size:18px; color:var(--text-secondary); max-width:560px; margin-bottom:36px; line-height:1.7; }
.hero-actions { display:flex; gap:16px; margin-bottom:48px; }
.hero-stats { display:flex; gap:36px; }
.stat { display:flex; flex-direction:column; gap:4px; }
.stat strong { font-size:28px; font-weight:700; color:var(--text-primary); }
.stat span { font-size:13px; color:var(--text-tertiary); text-transform:uppercase; letter-spacing:.05em; }

/* 演示窗口 */
.hero-visual { display:grid; place-items:center; }
.demo-window { width:100%; max-width:420px; background:var(--bg-card); border:1px solid var(--border-hover); border-radius:16px; overflow:hidden;
  box-shadow:0 30px 80px rgba(0,0,0,.6), 0 0 0 1px rgba(103,232,249,.08); animation:float-gentle 6s ease-in-out infinite; }
@keyframes float-gentle { 50% { transform:translateY(-12px); } }
.demo-header { display:flex; gap:6px; padding:14px 16px; background:rgba(0,0,0,.2); border-bottom:1px solid var(--border); }
.demo-header span { width:10px; height:10px; border-radius:50%; background:var(--text-tertiary); opacity:.4; }
.demo-content { padding:24px; }
.demo-label { font-size:11px; font-weight:600; text-transform:uppercase; letter-spacing:.1em; color:var(--text-tertiary); margin-bottom:14px; }
.demo-item { display:flex; align-items:center; gap:12px; padding:14px; margin-bottom:8px; background:rgba(255,255,255,.03); border:1px solid var(--border); border-radius:10px; font-size:15px; transition:all .2s; }
.demo-item:hover { background:rgba(255,255,255,.06); border-color:var(--border-hover); }
.demo-dot { width:10px; height:10px; border-radius:50%; background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple)); box-shadow:0 0 12px var(--glow-cyan); }

/* 按钮 */
.btn { display:inline-flex; align-items:center; gap:10px; padding:14px 28px; font-size:15px; font-weight:600; border-radius:12px;
  border:1px solid transparent; cursor:pointer; transition:all .25s var(--ease); font-family:inherit; }
.btn-primary { color:#000; background:linear-gradient(135deg,var(--accent-cyan),var(--accent-purple)); border-color:transparent;
  box-shadow:0 4px 16px rgba(103,232,249,.3); }
.btn-primary:hover { box-shadow:0 8px 24px rgba(103,232,249,.45); transform:translateY(-2px); }
.btn-primary svg { font-size:18px; }
.btn-secondary { color:var(--text-primary); background:rgba(255,255,255,.06); border-color:var(--border-hover); }
.btn-secondary:hover { background:rgba(255,255,255,.1); border-color:rgba(255,255,255,.2); }

/* 通用区块样式 */
section { position:relative; padding:100px 0; }
.section-header { text-align:center; max-width:720px; margin:0 auto 72px; }
.section-header h2 { font-size:clamp(36px,4.5vw,48px); font-weight:800; letter-spacing:-.02em; margin-bottom:16px; }
.section-header p { font-size:18px; color:var(--text-secondary); line-height:1.7; }

/* Features */
.features-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(320px,1fr)); gap:24px; }
.feature-card { padding:32px; background:var(--bg-card); border:1px solid var(--border); border-radius:16px; transition:all .3s var(--ease); }
.feature-card:hover { background:var(--bg-card-hover); border-color:var(--border-hover); transform:translateY(-4px); box-shadow:0 12px 32px rgba(0,0,0,.4); }
.feature-icon { width:48px; height:48px; display:grid; place-items:center; font-size:24px; color:var(--accent-cyan); margin-bottom:20px;
  background:linear-gradient(135deg,rgba(103,232,249,.15),rgba(167,139,250,.15)); border:1px solid var(--border-hover); border-radius:12px; }
.feature-card h3 { font-size:20px; font-weight:700; margin-bottom:12px; }
.feature-card p { font-size:15px; color:var(--text-secondary); line-height:1.6; }

/* How */
.steps { display:grid; grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:32px; }
.step { position:relative; padding:32px; background:var(--bg-card); border:1px solid var(--border); border-radius:16px; }
.step-num { position:absolute; top:-18px; left:32px; width:42px; height:42px; display:grid; place-items:center; font-size:18px; font-weight:700;
  color:var(--accent-cyan); background:var(--bg-dark); border:2px solid var(--accent-cyan); border-radius:50%; box-shadow:0 0 20px var(--glow-cyan); }
.step h3 { font-size:22px; font-weight:700; margin-bottom:12px; padding-top:12px; }
.step p { font-size:15px; color:var(--text-secondary); line-height:1.6; }

/* Download */
.download-card { display:flex; align-items:center; gap:32px; padding:40px; max-width:720px; margin:0 auto;
  background:var(--bg-card); border:1px solid var(--border-hover); border-radius:20px; box-shadow:0 20px 60px rgba(0,0,0,.5); }
.download-icon { width:80px; height:80px; display:grid; place-items:center; font-size:40px; flex-shrink:0;
  background:linear-gradient(135deg,rgba(103,232,249,.15),rgba(167,139,250,.15)); border:1px solid var(--border-hover); border-radius:16px; }
.download-info { flex:1; }
.download-info h3 { font-size:24px; font-weight:700; margin-bottom:6px; }
.download-info p { font-size:14px; color:var(--text-secondary); }
.download-card .btn { flex-shrink:0; }

/* Footer */
.footer { padding:48px 0; border-top:1px solid var(--border); text-align:center; }
.footer-tagline { font-size:15px; color:var(--text-secondary); margin-bottom:12px; }
.footer p { font-size:13px; color:var(--text-tertiary); }

/* 响应式 */
@media (max-width:1024px) {
  .hero .container { grid-template-columns:1fr; gap:48px; }
  .hero-visual { order:-1; max-width:400px; margin:0 auto; }
}
@media (max-width:768px) {
  .nav-links { position:fixed; top:72px; left:0; right:0; flex-direction:column; gap:0; padding:12px;
    background:rgba(13,14,20,.98); backdrop-filter:blur(18px); border-bottom:1px solid var(--border); box-shadow:0 12px 40px rgba(0,0,0,.6);
    opacity:0; visibility:hidden; transform:translateY(-12px); transition:all .25s var(--ease); }
  .nav-links.show { opacity:1; visibility:visible; transform:none; }
  .nav-links a { display:block; padding:14px 16px; font-size:16px; border-radius:10px; }
  .menu-btn { display:flex; }
  .hero { min-height:auto; padding:100px 0 60px; }
  .hero-title { font-size:clamp(32px,8vw,48px); }
  .hero-desc { font-size:16px; }
  .hero-stats { flex-wrap:wrap; gap:24px; }
  .hero-actions { flex-direction:column; }
  .features-grid, .steps { grid-template-columns:1fr; }
  .download-card { flex-direction:column; text-align:center; padding:32px 24px; }
  .section-header h2 { font-size:clamp(28px,7vw,40px); }
}