/* 基礎樣式（低 AI 風格，簡潔、清楚） */
:root {
    --bg: #0b0c0f;
    --card: #121419;
    --text: #e8eaf0;
    --muted: #a8b0bf;
    --primary: #3aa0ff;
    --primary-weak: #2a74b8;
    --border: #222632;
    --accent: #6be3ff;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans TC, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

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

.container {
    width: 100%;
    max-width: 1080px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */
.site-header {
    position: sticky; top: 0; z-index: 20;
    background: rgba(11,12,15,0.8);
    backdrop-filter: saturate(140%) blur(8px);
    border-bottom: 1px solid var(--border);
}
.nav {
    display: flex; align-items: center; justify-content: space-between;
    height: 64px;
}
.brand { font-weight: 700; letter-spacing: 0.2px; }
.menu { display: flex; gap: 16px; }
.menu a { color: var(--muted); padding: 8px 10px; border-radius: 8px; }
.menu a.active, .menu a:hover { color: var(--text); background: #171a21; }

/* Hero */
.hero {
    padding: 80px 0 48px;
    background: radial-gradient(1200px 600px at 10% -10%, rgba(58,160,255,0.12), transparent),
                radial-gradient(1000px 500px at 90% -20%, rgba(107,227,255,0.10), transparent);
}
.hero h1 { font-size: 40px; margin: 0 0 12px; }
.hero .subtitle { color: var(--muted); margin-bottom: 24px; }

.cta { display: flex; gap: 12px; }
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    height: 40px; padding: 0 16px;
    border-radius: 10px; border: 1px solid var(--border);
    background: #151922; color: var(--text);
}
.btn.primary { background: var(--primary); border-color: var(--primary-weak); color: #0c111a; font-weight: 600; }
.btn.ghost { background: transparent; }
.btn:hover { filter: brightness(1.05); }

/* Sections */
section { padding: 40px 0; }
.services-overview .grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px;
}
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); }

.featured { text-align: center; }
.featured p { color: var(--muted); }

/* Footer */
.site-footer { border-top: 1px solid var(--border); background: #0c1017; }
.site-footer .row {
    display: grid; grid-template-columns: 1fr 1fr; gap: 16px; padding: 24px 0;
}
.site-footer small { color: var(--muted); }

/* RWD */
@media (max-width: 900px) {
    .services-overview .grid { grid-template-columns: 1fr; }
    .hero h1 { font-size: 32px; }
}