:root {
    /* 色彩變數 */
    --color-primary: #000000;
    --color-bg-primary: #0a0a0a;
    --color-bg-secondary: #1a1a1a;
    --color-border: #333333;
    --color-text-primary: #ffffff;
    --color-text-secondary: #cccccc;
    --color-accent: #00d4ff;
    --color-accent-secondary: #ff6b35;
    
    /* 間距變數 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;
    --spacing-xxxl: 80px;
    
    /* 字體變數 */
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-size-xs: 14px;
    --font-size-sm: 16px;
    --font-size-md: 18px;
    --font-size-lg: 20px;
    --font-size-xl: 24px;
    --font-size-xxl: 28px;
    --font-size-xxxl: 36px;
    
    /* 圓角變數 */
    --border-radius-sm: 6px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    
    /* 陰影變數 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* 過渡變數 */
    --transition-fast: 0.2s ease-in-out;
    --transition-normal: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* 重置樣式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

.section {
    padding: var(--spacing-xxxl) 0;
}

.section-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent);
}

/* 導航樣式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
}

.navbar-brand {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-accent);
    text-decoration: none;
    transition: var(--transition-fast);
}

.navbar-brand:hover {
    color: var(--color-text-primary);
}

.navbar-nav {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.navbar-nav a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.navbar-nav a:hover,
.navbar-nav a.active {
    color: var(--color-accent);
}

.navbar-nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: var(--transition-fast);
}

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

/* 漢堡菜單 */
.navbar-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.navbar-toggle span {
    width: 25px;
    height: 3px;
    background: var(--color-text-primary);
    transition: var(--transition-fast);
}

/* 按鈕樣式 */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--border-radius-md);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    background: #00b8e6;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border: 2px solid var(--color-accent);
}

.btn-secondary:hover {
    background: var(--color-accent);
    color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-accent {
    background: var(--color-accent-secondary);
    color: var(--color-text-primary);
}

.btn-accent:hover {
    background: #e55a2b;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 卡片樣式 */
.card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-primary);
}

.card-text {
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* 網格系統 */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* 表單樣式 */
.form-group {
    margin-bottom: var(--spacing-md);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--color-text-primary);
}

.form-control {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm);
    color: var(--color-text-primary);
    font-size: var(--font-size-sm);
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
}

.form-control::placeholder {
    color: var(--color-text-secondary);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

/* 動畫類別 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-slow);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: var(--transition-slow);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: var(--transition-slow);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* 響應式設計 */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .grid-3 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .section-title {
        font-size: var(--font-size-xl);
    }
    
    .navbar-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-md);
        border-top: 1px solid var(--color-border);
    }
    
    .navbar-nav.active {
        display: flex;
    }
    
    .navbar-toggle {
        display: flex;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .btn {
        width: 100%;
        margin-bottom: var(--spacing-sm);
    }
}

/* 工具類別 */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }
.d-grid { display: grid; }

.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }

.w-full { width: 100%; }
.h-full { height: 100%; }


/* Hero 區域樣式 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0, 212, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 107, 53, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    text-align: center;
    z-index: 1;
    position: relative;
}

.hero-avatar {
    margin-bottom: var(--spacing-lg);
}

.avatar-circle {
    display: inline-block;
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.hero-title {
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* 技能預覽樣式 */
.skills-preview {
    background: var(--color-bg-secondary);
}

.skill-icon {
    text-align: center;
    margin-bottom: var(--spacing-md);
}

.skill-icon svg {
    transition: var(--transition-normal);
}

.card:hover .skill-icon svg {
    transform: scale(1.1);
}

/* 特色介紹樣式 */
.features {
    background: var(--color-bg-primary);
}

.feature-content {
    padding: var(--spacing-lg);
}

.feature-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.feature-description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.feature-list {
    list-style: none;
    margin-bottom: var(--spacing-xl);
}

.feature-list li {
    padding: var(--spacing-xs) 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: var(--spacing-md);
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

.feature-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.visual-container {
    width: 100%;
    max-width: 400px;
}

.visual-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

.visual-item {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-normal);
    animation: pulse 2s ease-in-out infinite;
}

.visual-item:nth-child(1) { animation-delay: 0s; }
.visual-item:nth-child(2) { animation-delay: 0.5s; }
.visual-item:nth-child(3) { animation-delay: 1s; }
.visual-item:nth-child(4) { animation-delay: 1.5s; }

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.05); opacity: 1; }
}

.visual-item:hover {
    transform: scale(1.1);
    border-color: var(--color-accent);
}

/* Discord 區域樣式 */
.discord-section {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg-primary) 100%);
}

.discord-content {
    max-width: 800px;
    margin: 0 auto;
}

.discord-description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.8;
}

.discord-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* 頁腳樣式 */
.footer {
    background: var(--color-primary);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-section h3,
.footer-section h4 {
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.footer-section p {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-section ul li a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--color-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    color: var(--color-text-secondary);
}

/* 響應式調整 */
@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-xxl);
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 200px;
    }
    
    .discord-stats {
        gap: var(--spacing-md);
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .visual-grid {
        grid-template-columns: 1fr;
    }
}


/* 頁面標題樣式 */
.page-header {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    text-align: center;
    position: relative;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.page-title {
    font-size: var(--font-size-xxxl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-accent), var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-subtitle {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* 關於我頁面樣式 */
.about-intro {
    background: var(--color-bg-primary);
}

.about-title {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text-primary);
}

.about-description {
    font-size: var(--font-size-md);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

.about-highlights {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

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

.highlight-number {
    font-size: var(--font-size-xxl);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.highlight-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.profile-card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.profile-avatar {
    margin-bottom: var(--spacing-lg);
}

.profile-info h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--spacing-xs);
}

.profile-info p {
    color: var(--color-text-secondary);
    font-size: var(--font-size-md);
}

/* 專業理念樣式 */
.philosophy {
    background: var(--color-bg-secondary);
}

.philosophy-card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition-normal);
}

.philosophy-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-accent);
}

.philosophy-icon {
    margin-bottom: var(--spacing-lg);
}

.philosophy-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.philosophy-description {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* 時間軸樣式 */
.experience {
    background: var(--color-bg-primary);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
    transform: translateX(-50%);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-xxxl);
    width: 50%;
}

.timeline-item:nth-child(odd) {
    left: 0;
    padding-right: var(--spacing-xl);
}

.timeline-item:nth-child(even) {
    left: 50%;
    padding-left: var(--spacing-xl);
}

.timeline-marker {
    position: absolute;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border: 3px solid var(--color-bg-primary);
    border-radius: 50%;
    top: 0;
}

.timeline-item:nth-child(odd) .timeline-marker {
    right: -8px;
}

.timeline-item:nth-child(even) .timeline-marker {
    left: -8px;
}

.timeline-content {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-sm);
}

.timeline-date {
    font-size: var(--font-size-sm);
    color: var(--color-accent);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.timeline-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.timeline-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.timeline-achievements {
    list-style: none;
}

.timeline-achievements li {
    color: var(--color-text-secondary);
    padding: var(--spacing-xs) 0;
    position: relative;
    padding-left: var(--spacing-md);
}

.timeline-achievements li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-accent);
}

/* 技術專長樣式 */
.expertise {
    background: var(--color-bg-secondary);
}

.expertise-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.expertise-category {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
}

.expertise-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-accent);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.expertise-item {
    margin-bottom: var(--spacing-lg);
}

.expertise-name {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: 500;
}

.expertise-level {
    background: var(--color-border);
    height: 8px;
    border-radius: 4px;
    overflow: hidden;
}

.expertise-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-secondary));
    width: 0;
    transition: width 2s ease-in-out;
    border-radius: 4px;
}

/* 響應式調整 */
@media (max-width: 1024px) {
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .about-highlights {
        justify-content: center;
        flex-wrap: wrap;
    }
}

@media (max-width: 768px) {
    .page-title {
        font-size: var(--font-size-xxl);
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        width: 100%;
        left: 0 !important;
        padding-left: var(--spacing-xl) !important;
        padding-right: 0 !important;
    }
    
    .timeline-marker {
        left: 12px !important;
        right: auto !important;
    }
    
    .about-highlights {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}