/* ==================== 
   全局變數與重置
==================== */
:root {
    --space-black: #0a0e27;
    --deep-space: #1a1f3a;
    --nebula-blue: #2d4a7c;
    --space-purple: #4c1d95;
    --star-white: #e8f4f8;
    --energy-cyan: #00d9ff;
    --energy-purple: #a855f7;
    --warning-amber: #ffb800;
    --danger-red: #ff3366;
    --success-green: #00ff88;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Noto Sans TC', sans-serif;
    background: var(--space-black);
    color: var(--star-white);
    overflow-x: hidden;
    line-height: 1.6;
}

/* ==================== 
   星空背景
==================== */
.starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    background: radial-gradient(ellipse at bottom, #1a1f3a 0%, #0a0e27 100%);
}

/* ==================== 
   主容器
==================== */
.main-container {
    position: relative;
    z-index: 1;
    min-height: 100vh;
}

/* ==================== 
   導航欄
==================== */
.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 2rem;
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 217, 255, 0.2);
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--energy-cyan), var(--energy-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    color: var(--star-white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--energy-cyan);
    transition: width 0.3s;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

/* ==================== 
   Hero 區域
==================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
}

.hero-content {
    max-width: 1200px;
    text-align: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid var(--energy-cyan);
    border-radius: 50px;
    margin-bottom: 2rem;
    animation: pulse-glow 2s ease-in-out infinite;
}

.badge-icon {
    font-size: 1.2rem;
}

.badge-text {
    font-size: 0.9rem;
    font-weight: 500;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 900;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    color: var(--energy-cyan);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--star-white);
    opacity: 0.8;
    margin-bottom: 3rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 4rem;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, var(--energy-cyan), var(--energy-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--star-white);
    opacity: 0.7;
    margin-top: 0.5rem;
}

/* ==================== 
   按鈕樣式
==================== */
.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: linear-gradient(135deg, var(--energy-cyan), var(--energy-purple));
    color: var(--space-black);
    box-shadow: 0 0 20px rgba(0, 217, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0, 217, 255, 0.5);
}

.btn-secondary {
    background: rgba(0, 217, 255, 0.1);
    color: var(--energy-cyan);
    border: 2px solid var(--energy-cyan);
}

.btn-secondary:hover {
    background: rgba(0, 217, 255, 0.2);
    transform: translateY(-2px);
}

.btn-icon {
    font-size: 1.3rem;
}

/* ==================== 
   課程地圖區域
==================== */
.curriculum-section {
    padding: 6rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 900;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--star-white);
    opacity: 0.7;
}

.mission-path {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.mission-level {
    animation: fade-in-up 0.6s ease-out;
}

.level-header {
    display: flex;
    align-items: center;
    gap: 2rem;
    padding: 2rem;
    background: rgba(26, 31, 58, 0.6);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    margin-bottom: 2rem;
}

.level-icon {
    font-size: 4rem;
    flex-shrink: 0;
}

.level-info {
    flex: 1;
}

.level-title {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.level-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.level-badge {
    padding: 0.3rem 1rem;
    background: linear-gradient(135deg, var(--energy-cyan), var(--energy-purple));
    color: var(--space-black);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

.level-time {
    padding: 0.3rem 1rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid var(--energy-cyan);
    border-radius: 20px;
    font-size: 0.9rem;
}

.level-modules {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    padding-left: 6rem;
}

.module-card {
    padding: 2rem;
    border-radius: 15px;
    text-decoration: none;
    color: var(--star-white);
    transition: all 0.3s;
    border: 1px solid rgba(0, 217, 255, 0.2);
}

.module-card:hover {
    transform: translateY(-5px);
    border-color: var(--energy-cyan);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.3);
}

.module-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.module-icon {
    font-size: 2rem;
}

.module-title {
    font-size: 1.3rem;
    font-weight: 600;
}

.module-desc {
    color: var(--star-white);
    opacity: 0.8;
    margin-bottom: 1rem;
    line-height: 1.6;
}

.module-tags {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.tag {
    padding: 0.3rem 0.8rem;
    background: rgba(0, 217, 255, 0.1);
    border: 1px solid var(--energy-cyan);
    border-radius: 15px;
    font-size: 0.8rem;
}

/* ==================== 
   關於區域
==================== */
.about-section {
    padding: 6rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2.5rem;
    border-radius: 15px;
    text-align: center;
    border: 1px solid rgba(0, 217, 255, 0.2);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--energy-cyan);
    box-shadow: 0 10px 30px rgba(0, 217, 255, 0.3);
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.feature-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--energy-cyan);
}

.feature-desc {
    color: var(--star-white);
    opacity: 0.8;
    line-height: 1.6;
}

/* ==================== 
   Footer
==================== */
.footer {
    padding: 3rem 2rem;
    border-top: 1px solid rgba(0, 217, 255, 0.2);
    margin-top: 4rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.footer-section h4 {
    color: var(--energy-cyan);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.footer-section p,
.footer-section a {
    color: var(--star-white);
    opacity: 0.7;
    text-decoration: none;
    display: block;
    margin-bottom: 0.5rem;
}

.footer-section a:hover {
    opacity: 1;
    color: var(--energy-cyan);
}

/* ==================== 
   通用樣式
==================== */
.glass {
    background: rgba(26, 31, 58, 0.6);
    backdrop-filter: blur(10px);
}

.hud-border {
    border: 2px solid var(--energy-cyan);
    box-shadow: 
        0 0 10px rgba(0, 217, 255, 0.3),
        inset 0 0 10px rgba(0, 217, 255, 0.1);
}

.text-glow {
    text-shadow: 
        0 0 20px rgba(0, 217, 255, 0.5),
        0 0 40px rgba(0, 217, 255, 0.3);
}

/* ==================== 
   動畫
==================== */
@keyframes fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes fade-in-up {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse-glow {
    0%, 100% {
        box-shadow: 0 0 10px rgba(0, 217, 255, 0.3);
    }
    50% {
        box-shadow: 0 0 20px rgba(0, 217, 255, 0.6);
    }
}

.fade-in {
    animation: fade-in 1s ease-out;
}

/* ==================== 
   響應式設計
==================== */
@media (max-width: 768px) {
    .nav-links {
        gap: 1rem;
    }
    
    .nav-link {
        font-size: 0.9rem;
    }
    
    .level-modules {
        padding-left: 0;
        grid-template-columns: 1fr;
    }
    
    .level-header {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: stretch;
    }
}

/* ==================== 
   自定義滾動條
==================== */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--space-black);
}

::-webkit-scrollbar-thumb {
    background: var(--nebula-blue);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--energy-cyan);
}