/* 基礎重置和變數定義 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 顏色變數 */
    --primary-dark: #1a1a2e;
    --secondary-dark: #16213e;
    --accent-dark: #0f3460;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-color: #64ffda;
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-hero: linear-gradient(135deg, #0c0c0c 0%, #1a1a2e 50%, #16213e 100%);
    
    /* 字型 */
    --font-primary: 'Inter', 'Noto Sans CJK TC', 'Microsoft JhengHei', sans-serif;
    --font-heading: 'Playfair Display', 'Noto Serif CJK TC', serif;
    
    /* 間距 - 響應式設計 */
    --container-max-width: 1200px;
    --section-padding: 5rem 0;
    --section-padding-mobile: 3rem 0;
    --card-radius: 1rem;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 響應式字體大小 */
    --font-size-xl: clamp(2.5rem, 5vw, 4rem);
    --font-size-lg: clamp(1.5rem, 3vw, 2.5rem);
    --font-size-md: clamp(1.125rem, 2vw, 1.5rem);
    --font-size-sm: clamp(0.875rem, 1.5vw, 1rem);
}

/* 基礎樣式 */
html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    background-color: var(--primary-dark);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
}

/* 導航欄樣式 - 響應式優化 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 26, 46, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem clamp(1rem, 4vw, 2rem);
    max-width: var(--container-max-width);
    margin: 0 auto;
    min-height: 70px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-shrink: 0;
}

.nav-brand .logo {
    width: clamp(32px, 5vw, 40px);
    height: auto;
}

.brand-text {
    font-weight: 600;
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-primary);
    white-space: nowrap;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: clamp(1rem, 3vw, 2rem);
    align-items: center;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition);
    position: relative;
    white-space: nowrap;
}

.nav-menu a:hover {
    color: var(--accent-color);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-color);
    transition: var(--transition);
}

.nav-menu a:hover::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: 0.5rem;
    z-index: 1001;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -6px);
}

/* 手機選單遮罩 */
.mobile-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 998;
    backdrop-filter: blur(2px);
}

/* 主要內容樣式 */
.main-content {
    padding-top: 70px;
}

/* Hero Section 樣式 - 響應式優化 */
.hero-section {
    min-height: 100vh;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    padding: 2rem 0;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-hero);
    z-index: -2;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="%23ffffff" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="%23ffffff" opacity="0.05"/><circle cx="50" cy="10" r="0.5" fill="%23ffffff" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>');
    z-index: -1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.3);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 clamp(1rem, 4vw, 2rem);
    animation: fadeInUp 1s ease-out;
}

.hero-logo {
    width: clamp(150px, 25vw, 250px);
    height: auto;
    margin-bottom: clamp(1rem, 3vw, 2rem);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

.hero-subtitle {
    font-size: var(--font-size-md);
    color: var(--accent-color);
    margin-bottom: clamp(1.5rem, 4vw, 2rem);
    font-weight: 300;
}

.hero-description {
    margin-bottom: clamp(2rem, 5vw, 3rem);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-description p {
    font-size: var(--font-size-sm);
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.cta-button {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--text-primary);
    padding: clamp(0.75rem, 2vw, 1rem) clamp(1.5rem, 4vw, 2rem);
    border: none;
    border-radius: 50px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 15px rgba(100, 255, 218, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(100, 255, 218, 0.4);
}

/* 內容區塊樣式 - 響應式優化 */
.content-section {
    padding: var(--section-padding);
    position: relative;
}

.content-section:nth-child(even) {
    background: rgba(22, 33, 62, 0.3);
}

.section-header {
    text-align: center;
    margin-bottom: clamp(3rem, 6vw, 4rem);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-number {
    display: inline-block;
    background: var(--gradient-primary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.section-title {
    font-family: var(--font-heading);
    font-size: var(--font-size-lg);
    margin-bottom: 1rem;
    color: var(--text-primary);
    font-weight: 400;
}

.section-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 300;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* 內容網格 - 響應式優化 */
.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-top: 2rem;
}

.content-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
}

.content-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

.card-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
    position: relative;
}

.card-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.3;
    z-index: 1;
}

.card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
    position: relative;
    z-index: 2;
}

.card-content {
    padding: clamp(1rem, 3vw, 1.5rem);
}

.card-content h3 {
    font-size: var(--font-size-md);
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.card-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tag {
    background: rgba(100, 255, 218, 0.1);
    color: var(--accent-color);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

.card-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

.card-link:hover {
    color: var(--text-primary);
}

/* 文章網格 - 響應式優化 */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-top: 2rem;
}

.article-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: clamp(1rem, 3vw, 1.5rem);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.article-card:hover {
    transform: translateY(-3px);
    border-color: var(--accent-color);
}

.article-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.article-date {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.article-category {
    background: var(--gradient-secondary);
    color: var(--text-primary);
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.75rem;
    font-weight: 500;
}

.article-title {
    font-size: var(--font-size-md);
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    line-height: 1.4;
}

.article-excerpt {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.article-link {
    color: var(--accent-color);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

.article-link:hover {
    color: var(--text-primary);
}

/* 觀察內容 - 響應式優化 */
.observations-content {
    margin-top: 2rem;
}

.observation-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: clamp(1.5rem, 4vw, 2rem);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.observation-card.featured {
    background: var(--gradient-primary);
    color: var(--text-primary);
}

.observation-content h3 {
    font-size: var(--font-size-md);
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.observation-content p {
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.observation-topics {
    list-style: none;
    padding-left: 0;
}

.observation-topics li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.observation-topics li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.observation-topics li:last-child {
    margin-bottom: 0;
}

/* 信念網格 - 響應式優化 */
.beliefs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-top: 2rem;
    margin-bottom: 3rem;
}

.belief-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: clamp(1.5rem, 4vw, 2rem);
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.belief-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.belief-icon {
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: 1rem;
}

.belief-card h3 {
    font-size: var(--font-size-md);
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.belief-card p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

.final-message {
    text-align: center;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--card-radius);
    padding: clamp(2rem, 5vw, 3rem);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-top: 2rem;
}

.final-message h3 {
    font-size: var(--font-size-lg);
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.final-message p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

/* 頁腳樣式 - 響應式優化 */
.footer {
    background: var(--secondary-dark);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding: clamp(2rem, 5vw, 3rem) 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: clamp(1.5rem, 4vw, 2rem);
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: var(--font-size-md);
    font-weight: 600;
}

.footer-section p {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: 1.6;
}

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

.footer-section li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: var(--transition);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* 動畫效果 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* 響應式設計 - 平板版 (768px - 1024px) */
@media (max-width: 1024px) and (min-width: 769px) {
    .container {
        padding: 0 2rem;
    }
    
    .content-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .articles-grid {
        grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    }
    
    .beliefs-grid {
        grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    }
    
    .hero-content {
        padding: 0 2rem;
    }
}

/* 響應式設計 - 手機版 (max-width: 768px) */
@media (max-width: 768px) {
    /* 導航欄手機版 */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(26, 26, 46, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: 2rem 0;
        transform: translateX(-100%);
        transition: var(--transition);
        z-index: 999;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
        gap: 0;
    }

    .nav-menu-open {
        transform: translateX(0);
    }

    .nav-menu li {
        width: 100%;
        text-align: center;
        margin-bottom: 0;
    }

    .nav-menu a {
        display: block;
        padding: 1rem 2rem;
        font-size: 1.125rem;
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    .nav-menu a:hover {
        background: rgba(255, 255, 255, 0.05);
    }

    .nav-menu li:last-child a {
        border-bottom: none;
    }

    .nav-toggle {
        display: flex;
    }
    
    /* 內容區塊手機版優化 */
    .content-section {
        padding: var(--section-padding-mobile);
    }
    
    .content-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .articles-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .beliefs-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
    }
    
    .article-meta {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
    
    .observation-topics li {
        font-size: 0.9rem;
        line-height: 1.5;
    }
}

/* 響應式設計 - 大螢幕桌機版 (min-width: 1025px) */
@media (min-width: 1025px) {
    .nav-menu {
        gap: 2.5rem;
    }

    .hero-content {
        padding: 0 1rem;
    }

    .container {
        padding: 0 2rem;
    }

    .content-grid {
        grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    }

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

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

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

    .card-content,
    .article-card {
        padding: 2rem;
    }
}

/* 響應式設計 - 極小螢幕 (max-width: 480px) */
@media (max-width: 480px) {
    .navbar {
        padding: 0.75rem 1rem;
    }

    .hero-logo {
        width: clamp(120px, 30vw, 180px);
        margin-bottom: 1rem;
    }

    .hero-description {
        margin-bottom: 2rem;
    }

    .cta-button {
        padding: 0.875rem 1.5rem;
        font-size: 0.9rem;
    }

    .content-section {
        padding: 2rem 0;
    }
    
    .section-header {
        margin-bottom: 2rem;
    }
    
    .card-content {
        padding: 1rem;
    }
    
    .article-card {
        padding: 1rem;
    }
    
    .observation-card {
        padding: 1.5rem;
    }
    
    .belief-card {
        padding: 1.5rem;
    }
    
    .final-message {
        padding: 1.5rem;
    }
}

/* 響應式設計 - 極大螢幕 (min-width: 1440px) */
@media (min-width: 1440px) {
    .container {
        max-width: 1400px;
    }
    
    .content-grid {
        grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    }
    
    .section-header {
        margin-bottom: 5rem;
    }
}

/* 可訪問性和使用者體驗優化 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* 高對比度模式支援 */
@media (prefers-contrast: high) {
    :root {
        --text-primary: #ffffff;
        --text-secondary: #cccccc;
        --accent-color: #00ffff;
    }
}

/* 深色模式支援 (已是預設) */
@media (prefers-color-scheme: dark) {
    /* 已經是深色主題，保持現有樣式 */
}

/* 載入狀態優化 */
body:not(.loaded) {
    overflow: hidden;
}

body:not(.loaded) .hero-content {
    opacity: 0;
    transform: translateY(50px);
}

body.loaded .hero-content {
    opacity: 1;
    transform: translateY(0);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

/* 卡片懸停效果加強 */
.content-card {
    cursor: pointer;
}

.content-card:hover .card-image img {
    transform: scale(1.05);
}

.article-card {
    cursor: pointer;
}

/* 圖片載入優化 */
img {
    transition: opacity 0.3s ease-in-out;
}

img[loading="lazy"].loaded,
img:not([loading="lazy"]) {
    opacity: 1;
}

/* 焦點樣式優化（無障礙設計） */
a:focus,
button:focus,
.nav-toggle:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* 選取文字樣式 */
::selection {
    background: var(--accent-color);
    color: var(--primary-dark);
}

::-moz-selection {
    background: var(--accent-color);
    color: var(--primary-dark);
}

/* 滾動條樣式（Webkit） */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--primary-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #4dd0d0;
}

/* Firefox 滾動條 */
* {
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) var(--primary-dark);
}