/* ========================================
   AI Infra Theme - 基於 aiinfra2.pdf 設計
   ======================================== */

:root {
    /* === 主要顏色 === */
    --primary-dark: #0a1929;
    --primary-navy: #152238;
    --primary-blue: #1a2942;
    --primary-deeper: #050d18;

    /* === 強調金色 === */
    --accent-gold: #d4af37;
    --accent-orange: #ff8c42;
    --accent-copper: #f4a460;
    --accent-gold-light: #f0d98e;

    /* === 科技藍色 === */
    --tech-cyan: #00d4ff;
    --tech-blue: #4dd0e1;
    --tech-teal: #26c6da;
    --tech-bright: #00ffff;

    /* === 文字顏色 === */
    --text-white: #ffffff;
    --text-gray: #b0bec5;
    --text-light: #cfd8dc;
    --text-dark: #78909c;

    /* === 漸層 === */
    --gradient-gold: linear-gradient(135deg, #d4af37 0%, #f4a460 50%, #ff8c42 100%);
    --gradient-blue: linear-gradient(135deg, #00d4ff 0%, #4dd0e1 50%, #26c6da 100%);
    --gradient-dark: linear-gradient(180deg, #0a1929 0%, #152238 100%);
    --gradient-dark-radial: radial-gradient(ellipse at top, #1a2942 0%, #0a1929 100%);

    /* === 陰影 === */
    --shadow-glow-gold: 0 0 30px rgba(212, 175, 55, 0.5);
    --shadow-glow-cyan: 0 0 30px rgba(0, 212, 255, 0.5);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-elevated: 0 12px 48px rgba(0, 0, 0, 0.6);

    /* === 邊框 === */
    --border-gold: 2px solid var(--accent-gold);
    --border-cyan: 2px solid var(--tech-cyan);
    --border-subtle: 1px solid rgba(255, 255, 255, 0.1);

    /* === 間距 === */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;
    --spacing-xxl: 120px;

    /* === 字體大小 === */
    --font-xs: 14px;
    --font-sm: 16px;
    --font-md: 18px;
    --font-lg: 24px;
    --font-xl: 36px;
    --font-xxl: 48px;
    --font-huge: 72px;

    /* === 動畫時間 === */
    --transition-fast: 0.2s;
    --transition-normal: 0.3s;
    --transition-slow: 0.5s;
}

/* ========================================
   全局樣式
   ======================================== */

body {
    background: var(--gradient-dark);
    color: var(--text-white);
    font-family: 'Inter', 'Noto Sans TC', sans-serif;
    margin: 0;
    padding: 0;
    overflow-x: hidden;
}

/* 背景粒子效果容器 */
.particles-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: var(--gradient-dark-radial);
}

/* ========================================
   按鈕樣式
   ======================================== */

.btn-gold-primary {
    background: var(--gradient-gold);
    color: var(--primary-dark);
    padding: 18px 48px;
    font-size: var(--font-md);
    font-weight: 700;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all var(--transition-normal) ease;
    box-shadow: var(--shadow-glow-gold);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-gold-primary:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 0 40px rgba(212, 175, 55, 0.8);
}

.btn-cyan-outline {
    background: transparent;
    color: var(--tech-cyan);
    padding: 16px 40px;
    font-size: var(--font-md);
    font-weight: 600;
    border: var(--border-cyan);
    border-radius: 50px;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    transition: all var(--transition-normal) ease;
}

.btn-cyan-outline:hover {
    background: var(--tech-cyan);
    color: var(--primary-dark);
    box-shadow: var(--shadow-glow-cyan);
    transform: translateY(-2px);
}

/* ========================================
   卡片樣式
   ======================================== */

.tech-card {
    background: rgba(26, 41, 66, 0.6);
    backdrop-filter: blur(10px);
    border: var(--border-subtle);
    border-radius: 20px;
    padding: var(--spacing-lg);
    transition: all var(--transition-normal) ease;
    box-shadow: var(--shadow-card);
}

.tech-card:hover {
    transform: translateY(-8px);
    border-color: var(--tech-cyan);
    box-shadow: var(--shadow-glow-cyan), var(--shadow-elevated);
}

.tech-card.featured {
    border: var(--border-gold);
    background: rgba(26, 41, 66, 0.8);
    transform: scale(1.05);
    box-shadow: var(--shadow-glow-gold), var(--shadow-elevated);
}

/* ========================================
   標題樣式
   ======================================== */

.heading-gold {
    background: var(--gradient-gold);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: 700;
    letter-spacing: 2px;
}

.heading-huge {
    font-size: var(--font-huge);
    line-height: 1.2;
}

.heading-xl {
    font-size: var(--font-xxl);
    line-height: 1.3;
}

.heading-lg {
    font-size: var(--font-xl);
    line-height: 1.4;
}

/* ========================================
   Section 容器
   ======================================== */

.section {
    padding: var(--spacing-xxl) var(--spacing-lg);
    position: relative;
}

.section-dark {
    background: var(--primary-darker);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-wide {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   特效元素
   ======================================== */

.glow-effect {
    position: relative;
}

.glow-effect::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: var(--gradient-blue);
    border-radius: inherit;
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: -1;
    filter: blur(10px);
}

.glow-effect:hover::before {
    opacity: 1;
}

/* 電路紋理背景 */
.circuit-bg {
    background-image:
        repeating-linear-gradient(90deg,
            transparent,
            transparent 50px,
            rgba(0, 212, 255, 0.03) 50px,
            rgba(0, 212, 255, 0.03) 51px),
        repeating-linear-gradient(0deg,
            transparent,
            transparent 50px,
            rgba(0, 212, 255, 0.03) 50px,
            rgba(0, 212, 255, 0.03) 51px);
}

/* 六角形圖案 */
.hexagon-pattern {
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100" height="100"><path d="M50 0L93.3 25L93.3 75L50 100L6.7 75L6.7 25Z" fill="none" stroke="rgba(0,212,255,0.1)" stroke-width="1"/></svg>');
    background-size: 100px 100px;
}

/* ========================================
   動畫
   ======================================== */

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 20px rgba(212, 175, 55, 0.5);
    }
    50% {
        box-shadow: 0 0 40px rgba(212, 175, 55, 0.8);
    }
}

@keyframes rotate-slow {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.8s ease-out;
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

.animate-pulse-glow {
    animation: pulse-glow 2s ease-in-out infinite;
}

/* ========================================
   響應式設計
   ======================================== */

@media (max-width: 768px) {
    :root {
        --font-huge: 40px;
        --font-xxl: 32px;
        --font-xl: 24px;
        --spacing-xl: 48px;
        --spacing-xxl: 64px;
    }

    .btn-gold-primary {
        padding: 14px 32px;
        font-size: var(--font-sm);
    }

    .tech-card {
        padding: var(--spacing-md);
    }

    .section {
        padding: var(--spacing-xl) var(--spacing-sm);
    }
}

/* ========================================
   實用類別
   ======================================== */

.text-center { text-align: center; }
.text-gold { color: var(--accent-gold); }
.text-cyan { color: var(--tech-cyan); }
.text-gray { color: var(--text-gray); }

.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }