/* ============================================================
   Visual Agent — OpenClaw-style design system
   Dark, minimal, coral accent. Shared across all pages.
   ============================================================ */

@import url('https://api.fontshare.com/v2/css?f[]=switzer@400,500,600,700,800&display=swap');

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

:root {
  --bg: #0a0f0d;              /* 墨綠黑 */
  --bg-elev: #0d1411;
  --surface: #101814;
  --surface-2: #15201b;
  --border: rgba(120, 200, 160, 0.10);
  --border-strong: rgba(120, 200, 160, 0.20);

  --accent: #34d399;          /* 亮墨綠 / emerald */
  --accent-dim: #10b981;
  --accent-glow: rgba(52, 211, 153, 0.20);

  --text: #eef5f0;
  --text-dim: #93a89c;
  --text-faint: #5e7268;

  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 18px;
  --maxw: 1120px;

  --font: 'Switzer', 'Inter', system-ui, -apple-system, 'Segoe UI',
          'Microsoft JhengHei', '微軟正黑體', 'PingFang TC', sans-serif;
  --mono: 'JetBrains Mono', 'Fira Code', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

html { scroll-behavior: smooth; }

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

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

/* ---------------- Nav ---------------- */
.site-nav {
  position: sticky; top: 0; z-index: 1000;
  background: rgba(11, 11, 11, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; padding: 0 24px;
}
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 34px; height: 34px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 0 16px var(--accent-glow); overflow: hidden;
}
.brand-mark img { width: 100%; height: 100%; display: block; }
.brand-name { font-weight: 700; font-size: 1.12rem; letter-spacing: -0.3px; }
.nav-links { display: flex; align-items: center; gap: 4px; list-style: none; }
.nav-links a {
  color: var(--text-dim); font-weight: 500; font-size: 0.94rem;
  padding: 8px 14px; border-radius: 8px; transition: color .18s, background .18s;
}
.nav-links a:hover { color: var(--text); background: var(--surface); }
.nav-links a.active { color: var(--accent); }
.nav-cta {
  margin-left: 8px; padding: 8px 16px; border-radius: 9px;
  background: var(--accent); color: #0a0f0d !important;
  font-weight: 600; transition: transform .15s, box-shadow .15s;
}
.nav-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--accent-glow); background: var(--accent); }

.nav-lang {
  margin-left: 8px; background: var(--surface); color: var(--text-dim);
  border: 1px solid var(--border-strong); border-radius: 8px;
  padding: 7px 13px; font-weight: 600; font-size: 0.88rem; cursor: pointer;
  font-family: var(--font); transition: color .15s, border-color .15s;
}
.nav-lang:hover { color: var(--accent); border-color: var(--accent); }

.nav-toggle { display: none; background: none; border: 1px solid var(--border); color: var(--text); border-radius: 8px; padding: 8px 10px; font-size: 18px; cursor: pointer; }

/* ---------------- Hero ---------------- */
.hero { padding: 96px 0 64px; position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; top: -180px; left: 50%;
  transform: translateX(-50%);
  width: 720px; height: 420px;
  background: radial-gradient(ellipse at center, var(--accent-glow), transparent 70%);
  pointer-events: none;
}
.eyebrow {
  display: inline-block; font-size: 0.78rem; font-weight: 600; letter-spacing: 1.4px;
  text-transform: uppercase; color: var(--accent);
  border: 1px solid var(--border-strong); border-radius: 100px;
  padding: 5px 14px; margin-bottom: 24px;
}
.hero h1 {
  font-size: clamp(2.4rem, 5.6vw, 3.8rem); font-weight: 600;
  line-height: 1.08; letter-spacing: -1.2px; max-width: 16ch;
}
.hero h1 .accent { color: var(--accent); }
.hero p.lead {
  margin-top: 22px; font-size: 1.12rem; color: var(--text-dim);
  max-width: 56ch; line-height: 1.7;
}
.hero-actions { margin-top: 34px; display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 22px; border-radius: 10px; font-weight: 600; font-size: 0.98rem;
  cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s; border: 1px solid transparent;
}
.btn-primary { background: var(--accent); color: #0a0f0d; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 8px 24px var(--accent-glow); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { background: var(--surface-2); transform: translateY(-1px); }

/* ---------------- Sections ---------------- */
.section { padding: 72px 0; }
.section.alt { background: var(--bg-elev); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-head .eyebrow { margin-bottom: 16px; }
.section-head h2 { font-size: clamp(1.8rem, 3.6vw, 2.4rem); font-weight: 600; letter-spacing: -0.8px; }
.section-head p { margin-top: 14px; color: var(--text-dim); font-size: 1.05rem; }

/* ---------------- Feature grid ---------------- */
.grid { display: grid; gap: 18px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }

.card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 26px; transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.card .ico {
  width: 42px; height: 42px; border-radius: 10px;
  background: var(--accent-glow); color: var(--accent);
  display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 16px;
}
.card h3 { font-size: 1.12rem; font-weight: 600; margin-bottom: 8px; }
.card p { color: var(--text-dim); font-size: 0.95rem; }

/* ---------------- Screenshot placeholder ---------------- */
.shot {
  border: 1px dashed var(--border-strong); border-radius: var(--radius);
  background: repeating-linear-gradient(45deg, var(--surface), var(--surface) 12px, var(--bg-elev) 12px, var(--bg-elev) 24px);
  min-height: 320px; display: flex; flex-direction: column;
  align-items: center; justify-content: center; text-align: center;
  color: var(--text-faint); padding: 32px;
}
.shot .shot-ico { font-size: 34px; opacity: .5; margin-bottom: 10px; }
.shot .shot-label { font-weight: 600; color: var(--text-dim); }
.shot .shot-hint { font-size: 0.85rem; margin-top: 6px; }

/* ---------------- Terminal / code ---------------- */
.terminal {
  background: #060a08; border: 1px solid var(--border-strong);
  border-radius: var(--radius); overflow: hidden;
}
.terminal-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.terminal-bar .dot { width: 11px; height: 11px; border-radius: 50%; }
.dot.r { background: #ff5f56; } .dot.y { background: #ffbd2e; } .dot.g { background: #27c93f; }
.terminal-bar .title { margin-left: 8px; font-size: 0.82rem; color: var(--text-faint); font-family: var(--mono); }
.terminal-body { padding: 18px 20px; font-family: var(--mono); font-size: 0.9rem; line-height: 1.9; color: var(--text); position: relative; }
.terminal-body .prompt { color: var(--accent); }
.terminal-body .cmd { color: var(--text); }
.terminal-body .comment { color: var(--text-faint); }
.copy-btn {
  position: absolute; top: 12px; right: 14px;
  background: var(--surface-2); border: 1px solid var(--border-strong);
  color: var(--text-dim); border-radius: 7px; padding: 5px 10px;
  font-size: 0.78rem; cursor: pointer; transition: color .15s, border-color .15s;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }

/* ---------------- Tabs (quick start) ---------------- */
.tabs { display: flex; gap: 8px; justify-content: center; margin-bottom: 22px; flex-wrap: wrap; }
.tab {
  background: var(--surface); border: 1px solid var(--border); color: var(--text-dim);
  padding: 8px 16px; border-radius: 9px; font-weight: 500; cursor: pointer; font-size: 0.9rem;
  transition: color .15s, border-color .15s, background .15s;
}
.tab.active { color: var(--accent); border-color: var(--accent); background: var(--accent-glow); }

/* ---------------- Steps ---------------- */
.steps { display: grid; gap: 14px; counter-reset: step; }
.step {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 20px 22px;
}
.step .num {
  flex: 0 0 30px; width: 30px; height: 30px; border-radius: 50%;
  background: var(--accent-glow); color: var(--accent); font-weight: 700;
  display: flex; align-items: center; justify-content: center; font-size: 0.9rem;
}
.step h4 { font-size: 1.02rem; font-weight: 600; margin-bottom: 4px; }
.step p { color: var(--text-dim); font-size: 0.92rem; }

/* ---------------- Pills / tags ---------------- */
.pills { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
.pill {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 100px; padding: 7px 16px; font-size: 0.88rem; color: var(--text-dim);
}
.pill b { color: var(--text); }

/* ---------------- Footer ---------------- */
.site-footer { border-top: 1px solid var(--border); padding: 48px 0 40px; background: var(--bg-elev); }
.footer-inner { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
.footer-brand { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.footer-cols { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-col h5 { font-size: 0.82rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-faint); margin-bottom: 12px; }
.footer-col a { display: block; color: var(--text-dim); font-size: 0.92rem; padding: 4px 0; transition: color .15s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border); color: var(--text-faint); font-size: 0.85rem; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 860px) {
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav-links { display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; background: var(--bg); border-bottom: 1px solid var(--border); padding: 12px; }
  .nav-links.open { display: flex; }
  .nav-toggle { display: block; }
  .nav-cta { margin: 6px 0 0; text-align: center; }
}