:root {
    --titanium-gray: #B0C4DE;
    --afterburner-blue: #00BFFF;
    --ceramic-black: #1A1A1B;
    --warning-white: #F8F9FA;
    --dark-bg: #0a0a0b;
    --accent-glow: rgba(0, 191, 255, 0.3);
}

body {
    background-color: var(--dark-bg);
    color: var(--warning-white);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    overflow-x: hidden;
}

.mono-font {
    font-family: 'JetBrains Mono', 'Courier New', Courier, monospace;
}

/* 導覽列樣式 */
.navbar {
    background-color: rgba(26, 26, 27, 0.95);
    border-bottom: 1px solid var(--titanium-gray);
    backdrop-filter: blur(10px);
}

.navbar-brand {
    font-weight: 800;
    letter-spacing: 2px;
    color: var(--afterburner-blue) !important;
}

.nav-link {
    color: var(--titanium-gray) !important;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

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

/* 鈦金屬質感卡片 */
.tech-card {
    background: linear-gradient(145deg, #1e1e20, #131314);
    border: 1px solid rgba(176, 196, 222, 0.2);
    border-radius: 0;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
    position: relative;
    overflow: hidden;
}

.tech-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 0;
    background: var(--afterburner-blue);
    transition: height 0.4s ease;
}

.tech-card:hover {
    border-color: var(--afterburner-blue);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.tech-card:hover::before {
    height: 100%;
}

/* 標題樣式 */
h1, h2, h3 {
    text-transform: uppercase;
    letter-spacing: 3px;
    font-weight: 700;
}

.section-title {
    border-left: 4px solid var(--afterburner-blue);
    padding-left: 1rem;
    margin-bottom: 3rem;
}

/* 按鈕樣式 */
.btn-thrust {
    background: transparent;
    border: 1px solid var(--afterburner-blue);
    color: var(--afterburner-blue);
    border-radius: 0;
    padding: 0.8rem 2rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.btn-thrust:hover {
    background: var(--afterburner-blue);
    color: var(--ceramic-black);
    box-shadow: 0 0 20px var(--accent-glow);
}

/* 頁尾 */
footer {
    background-color: var(--ceramic-black);
    border-top: 1px solid rgba(176, 196, 222, 0.1);
    padding: 4rem 0 2rem;
    margin-top: 5rem;
}

.footer-brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--afterburner-blue);
    margin-bottom: 1rem;
}

.footer-link {
    color: var(--titanium-gray);
    text-decoration: none;
    font-size: 0.9rem;
    display: block;
    margin-bottom: 0.5rem;
}

.footer-link:hover {
    color: var(--afterburner-blue);
}

/* 動畫 */
@keyframes pulse-blue {
    0% { opacity: 0.4; }
    50% { opacity: 1; }
    100% { opacity: 0.4; }
}

.glow-text {
    animation: pulse-blue 3s infinite ease-in-out;
}