/* Theme */
:root {
  --bg: #016B61;             /* 深青/主题底色 */
  --bg-alt: #014b45;         /* 背景渐变辅助深色 */
  --text: #E5E9C5;           /* 主文本（浅黄绿） */
  --muted: #9ECFD4;          /* 次级文本（浅青） */
  --primary: #70B2B2;        /* 主按钮/高亮（青） */
  --primary-strong: #016B61; /* 渐变深色端（深青） */
  --glass: rgba(255, 255, 255, 0.08);
  --glass-border: rgba(255, 255, 255, 0.15);
  --accent-1: #70B2B2;
  --accent-2: #9ECFD4;
  --accent-3: #E5E9C5;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 800px at 10% -10%, var(--bg-alt) 0%, transparent 60%), var(--bg);
  line-height: 1.6;
}

/* Animated background orbs */
.bg-animated {
  position: fixed;
  inset: -20vmax;
  z-index: -1;
  filter: blur(50px) saturate(120%);
  opacity: 0.6;
  pointer-events: none;
}
.orb {
  position: absolute;
  width: 40vmax;
  height: 40vmax;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--accent-1), transparent 60%);
  animation: float 18s ease-in-out infinite;
  mix-blend-mode: screen;
}
.orb-1 { top: 0; left: 0; }
.orb-2 { right: 0; top: 30vh; background: radial-gradient(circle at 70% 30%, var(--accent-2), transparent 60%); animation-delay: -6s; }
.orb-3 { left: 10vw; bottom: 0; background: radial-gradient(circle at 50% 70%, var(--accent-3), transparent 60%); animation-delay: -12s; }
@keyframes float {
  0%, 100% { transform: translateY(0) translateX(0); }
  50% { transform: translateY(-4vmax) translateX(2vmax) scale(1.02); }
}

/* Layout */
.container { width: min(1160px, 92vw); margin: 0 auto; }
.section { padding: 72px 0; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.02) 10%, transparent); }
.section-title { font-size: clamp(24px, 3.2vw, 36px); line-height: 1.2; margin: 0 0 24px 0; }

/* Header */
.site-header { position: sticky; top: 0; backdrop-filter: blur(12px); background: rgba(9, 12, 19, 0.6); border-bottom: 1px solid rgba(255,255,255,0.06); z-index: 20; }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--text); text-decoration: none; }
.brand-logo { width: 32px; height: 32px; border-radius: 8px; box-shadow: var(--shadow); }
.brand-name { font-weight: 800; letter-spacing: 0.2px; }
.nav a { color: var(--text); text-decoration: none; margin-left: 16px; opacity: 0.85; }
.nav a:hover { opacity: 1; }

/* Buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; padding: 12px 18px; border-radius: 12px; border: 1px solid transparent; color: var(--text); text-decoration: none; transition: transform .15s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease; will-change: transform; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-small { padding: 8px 12px; border-radius: 10px; font-size: 14px; }
.btn-large { padding: 14px 20px; font-weight: 600; }
.btn-primary { background: linear-gradient(135deg, var(--primary-strong), var(--primary)); box-shadow: 0 8px 24px rgba(1,107,97,0.35); }
.btn-primary:hover { box-shadow: 0 12px 28px rgba(1,107,97,0.45); }
.btn-ghost { background: transparent; border-color: rgba(255,255,255,0.18); }

/* Hero */
.hero { padding: 56px 0 24px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 36px; align-items: center; }
.hero-copy h1 { font-size: clamp(28px, 4.4vw, 56px); line-height: 1.05; margin: 0 0 16px 0; letter-spacing: -0.02em; }
.lead { font-size: 18px; color: var(--text); opacity: 0.92; }
.cta-row { display: flex; gap: 12px; margin: 18px 0 4px; flex-wrap: wrap; }
.subtle { color: var(--muted); font-size: 14px; }
.hero-media .media-card { overflow: hidden; border-radius: 18px; border: 1px solid var(--glass-border); box-shadow: var(--shadow); }
.hero-media img { display: block; width: 100%; height: auto; }

/* Cards / grids */
.grid { display: grid; gap: 18px; }
.features-grid { grid-template-columns: repeat(4, 1fr); }
.modes-grid { grid-template-columns: repeat(3, 1fr); }
.card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.1); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); }
.card h3 { margin: 10px 0 6px 0; font-size: 18px; }
.card p { color: var(--muted); margin: 0; }
.glass { background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(16px) saturate(120%); }
.icon { width: 44px; height: 44px; border-radius: 12px; background: linear-gradient(135deg, rgba(112,178,178,0.18), rgba(158,207,212,0.14)); display: inline-flex; align-items: center; justify-content: center; color: var(--primary); border: 1px solid rgba(112,178,178,0.35); }

/* CTA strip */
.cta-strip { padding: 40px 0 64px; }
.cta-strip-inner { display: flex; align-items: center; justify-content: space-between; gap: 14px; background: linear-gradient(135deg, rgba(1,107,97,0.16), rgba(112,178,178,0.16), rgba(158,207,212,0.16)); border: 1px solid rgba(255,255,255,0.14); border-radius: 18px; padding: 18px; box-shadow: var(--shadow); }
.cta-copy h2 { margin: 0 0 6px 0; }
.cta-copy p { margin: 0; color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid rgba(255,255,255,0.08); padding: 22px 0 48px; background: linear-gradient(0deg, rgba(255,255,255,0.02), transparent); }
.footer-inner { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-nav a { color: var(--muted); text-decoration: none; margin-left: 12px; }
.footer-nav a:hover { color: var(--text); }

/* Forms */
.form-row { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.form-row label { font-weight: 600; color: var(--text); opacity: 0.9; }
.form-row input, .form-row textarea { width: 100%; padding: 12px 14px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.18); background: rgba(255,255,255,0.06); color: var(--text); outline: none; transition: border-color .2s ease, box-shadow .2s ease, background .2s ease; }
.form-row input::placeholder, .form-row textarea::placeholder { color: rgba(230,238,247,0.6); }
.form-row input:focus, .form-row textarea:focus { border-color: var(--primary); background: rgba(255,255,255,0.08); box-shadow: 0 0 0 3px rgba(112,178,178,0.22); }
.form-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 8px; }

/* Responsive */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .modes-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .nav a { display: none; }
  .btn-small { display: inline-flex; }
  .cta-strip-inner { flex-direction: column; align-items: flex-start; }
}