:root {
    --primary-purple: #4B0082; /* 糾纏深紫 */
    --accent-cyan: #00FFFF;   /* 疊加電青 */
    --dark-black: #0A0A0A;    /* 退相干墨黑 */
    --photon-gold: #FFD700;   /* 光子金 */
    --text-light: #E0E0E0;
    --font-main: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-mono: 'Fira Code', 'Courier New', monospace;
}

body {
    background-color: var(--dark-black);
    color: var(--text-light);
    font-family: var(--font-main);
    overflow-x: hidden;
    line-height: 1.6;
}

/* 量子背景效果 */
.quantum-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: radial-gradient(circle at 50% 50%, var(--primary-purple) 0%, var(--dark-black) 100%);
    opacity: 0.6;
}

.navbar {
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 255, 255, 0.2);
    padding: 1rem 2rem;
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--accent-cyan) !important;
    text-transform: uppercase;
}

.nav-link {
    color: var(--text-light) !important;
    margin: 0 10px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: 0.3s;
}

.nav-link:hover, .nav-link.active {
    color: var(--accent-cyan) !important;
    text-shadow: 0 0 10px var(--accent-cyan);
}

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 100px 20px;
    position: relative;
}

.hero-title {
    font-size: 4rem;
    font-weight: 900;
    background: linear-gradient(45deg, var(--accent-cyan), var(--photon-gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-light);
    max-width: 800px;
    margin: 0 auto 2rem;
    font-weight: 300;
}

.btn-quantum {
    background: transparent;
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 12px 30px;
    border-radius: 0;
    text-transform: uppercase;
    letter-spacing: 2px;
    transition: 0.4s;
    position: relative;
    overflow: hidden;
}

.btn-quantum:hover {
    background: var(--accent-cyan);
    color: var(--dark-black);
    box-shadow: 0 0 20px var(--accent-cyan);
}

.card-quantum {
    background: rgba(75, 0, 130, 0.1);
    border: 1px solid rgba(0, 255, 255, 0.1);
    border-radius: 0;
    padding: 2rem;
    transition: 0.4s;
    height: 100%;
}

.card-quantum:hover {
    border-color: var(--accent-cyan);
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 255, 255, 0.1);
}

.section-title {
    color: var(--accent-cyan);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 3rem;
    text-align: center;
}

footer {
    padding: 4rem 0;
    border-top: 1px solid rgba(0, 255, 255, 0.1);
    background: var(--dark-black);
}

.footer-logo {
    color: var(--accent-cyan);
    font-weight: 800;
    font-size: 1.5rem;
}

.footer-link {
    color: #888;
    text-decoration: none;
    transition: 0.3s;
}

.footer-link:hover {
    color: var(--accent-cyan);
}

/* 數學公式樣式 */
.math-block {
    font-family: var(--font-mono);
    background: rgba(0, 255, 255, 0.05);
    padding: 1rem;
    border-left: 3px solid var(--accent-cyan);
    margin: 1rem 0;
}

/* 數據看板樣式 */
.dashboard-stat {
    border: 1px solid rgba(255, 215, 0, 0.3);
    padding: 1.5rem;
    text-align: center;
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--photon-gold);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    color: #aaa;
}