:root {
    /* Colors */
    --bg-main: #0A0F1C;
    --bg-surface: #0D1321;
    --bg-card: #1E293B;
    --accent-cyan: #22D3EE;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --border-color: #1E293B;
    
    /* Fonts */
    --font-mono: 'JetBrains Mono', monospace;
    --font-sans: 'Noto Sans TC', sans-serif;
    --font-inter: 'Inter', sans-serif;
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-sans);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
}

/* Utilities */
.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.gap-8 { gap: 32px; }

.text-cyan { color: var(--accent-cyan); }
.text-muted { color: var(--text-muted); }
.font-mono { font-family: var(--font-mono); }
.font-bold { font-weight: 700; }
.text-sm { font-size: 14px; }
.text-xs { font-size: 12px; }

/* Buttons */
.btn {
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 700;
    transition: all 0.2s;
}

.btn-primary {
    background-color: var(--accent-cyan);
    color: var(--bg-main);
}

.btn-primary:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn-outline {
    border: 1px solid var(--border-color);
    color: var(--text-muted);
}

.btn-rounded {
    border-radius: 100px;
}

/* Inputs */
.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.label {
    font-size: 12px;
    color: var(--text-muted);
}

.input, .select, .textarea {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 16px;
    border-radius: 6px;
    font-family: var(--font-sans);
    font-size: 14px;
    width: 100%;
}

.input:focus, .textarea:focus {
    outline: none;
    border-color: var(--accent-cyan);
}

/* Navbar */
.navbar {
    height: 80px;
    background-color: var(--bg-main);
    border-bottom: 1px solid rgba(30, 41, 59, 0.5);
}

.nav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--text-muted);
    transition: color 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--text-main);
}

.logo {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 20px;
    color: var(--accent-cyan);
    letter-spacing: 2px;
}

/* Hero */
.hero {
    padding: 80px 24px;
    text-align: center;
}

.hero h1 {
    font-size: 64px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero p {
    font-size: 18px;
    color: var(--text-muted);
    max-width: 640px;
    margin: 0 auto 40px;
}

.preview-frame {
    width: 100%;
    max-width: 1000px;
    height: 400px;
    background-color: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--accent-cyan);
    margin: 60px auto 0;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}