/* ========================================
   設計系統變數 - 墨綠主題 (#7DA78C)
   ======================================== */
:root {
    /* 主色系統 - 以 #7DA78C 墨綠為核心 */
    --primary-main: #7DA78C;
    --primary-light: #9BC4A5;
    --primary-dark: #5A8A6A;
    --primary-darker: #4A7A5A;

    /* 背景色階 - 亮米色主題 */
    --bg-primary: #faf6ed;
    --bg-card: #ffffff;
    --bg-card-alt: #fffbf3;
    --bg-hover: #f0ece4;

    /* 文字色階 */
    --text-primary: #2a2620;
    --text-secondary: #6b5f4a;
    --text-muted: #9b8f7a;

    /* 邊框與分隔 */
    --border-color: #e8dfce;
    --border-light: #f5efe6;

    /* 語意色彩 */
    --success: #5cb85c;
    --error: #c85a3a;
    --warning: #e8a33c;

    /* 圓角規範 */
    --radius-card: 12px;
    --radius-button: 8px;
    --radius-sm: 6px;

    /* 間距規範 */
    --spacing-section: 4rem;
    --spacing-card: 1.5rem;

    /* 字體設定 */
    --font-main: 'Zen Maru Gothic', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-code: 'JetBrains Mono', 'Fira Code', 'Monaco', monospace;

    /* 動畫 */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s ease;
}

/* ========================================
   基礎重置與字體設定
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-weight: 400;
    letter-spacing: 0.02em;
}

/* 字級階層系統 */
h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    line-height: 1.3;
    letter-spacing: 0.01em;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 1.5rem;
}

h3 {
    font-size: clamp(1.125rem, 2.5vw, 1.375rem);
    font-weight: 600;
    line-height: 1.4;
}

h4 {
    font-size: 1rem;
    font-weight: 600;
}

p {
    font-size: 1rem;
    line-height: 1.7;
}

small, .text-small {
    font-size: 0.875rem;
    line-height: 1.6;
}

.text-muted {
    color: var(--text-muted);
}

/* 程式碼字體 */
code, pre {
    font-family: var(--font-code);
    font-size: 0.875rem;
}

/* 容器系統 - 響應式寬度 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

@media (min-width: 768px) {
    .container {
        padding: 0 2rem;
    }
}

@media (min-width: 1200px) {
    .container {
        padding: 0 1.5rem;
    }
}

/* ========================================
   Header 導航列
   ======================================== */
header {
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(42, 38, 32, 0.04);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo i {
    color: var(--primary-main);
    font-size: 1.375rem;
}

/* 主要按鈕樣式 */
.btn-primary {
    background-color: var(--primary-main);
    color: white;
    padding: 0.625rem 1.5rem;
    border-radius: var(--radius-button);
    text-decoration: none;
    font-weight: 500;
    transition: all var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(125, 167, 140, 0.3);
}

/* ========================================
   Hero 主視覺區塊
   ======================================== */
.hero {
    padding: var(--spacing-section) 0;
    background: linear-gradient(135deg, var(--bg-primary) 0%, var(--bg-card-alt) 50%, var(--bg-primary) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    align-items: center;
}

@media (min-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr 1fr;
        gap: 4rem;
    }
}

.hero-content h1 {
    margin-bottom: 1.25rem;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2.5vw, 1.35rem);
    color: var(--text-secondary);
    margin-bottom: 2rem;
    font-weight: 400;
}

.price-tag {
    display: inline-flex;
    flex-direction: column;
    background-color: var(--bg-card);
    padding: 1.5rem 2rem;
    border-radius: var(--radius-card);
    border: 2px solid var(--primary-light);
    margin-bottom: 2rem;
    box-shadow: 0 4px 16px rgba(125, 167, 140, 0.1);
}

.price {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.btn-large {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--primary-main);
    color: white;
    padding: 1rem 2.5rem;
    border-radius: var(--radius-button);
    text-decoration: none;
    font-size: 1.125rem;
    font-weight: 600;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 16px rgba(125, 167, 140, 0.25);
}

.btn-large:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(125, 167, 140, 0.35);
}

/* ========================================
   程式碼預覽區塊
   ======================================== */
.code-preview {
    background-color: #2d3430;
    border-radius: var(--radius-card);
    overflow: hidden;
    box-shadow: 0 12px 40px rgba(42, 38, 32, 0.12);
    border: 1px solid var(--border-color);
}

.window-header {
    background-color: #3d4440;
    padding: 0.75rem 1rem;
    display: flex;
    gap: 0.5rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red {
    background-color: #e07a5f;
}

.dot.yellow {
    background-color: #f2cc8f;
}

.dot.green {
    background-color: #81b29a;
}

.code-content {
    padding: 1.5rem;
}

.code-content pre {
    color: #e8e4dc;
    font-family: var(--font-code);
    font-size: 0.9rem;
    line-height: 1.8;
    letter-spacing: 0.02em;
}

/* ========================================
   課程特色區塊
   ======================================== */
.features {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-card);
}

.features h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.25rem;
}

@media (min-width: 640px) {
    .feature-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 992px) {
    .feature-grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.feature-card {
    background-color: var(--bg-card-alt);
    padding: 2rem;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: all var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(125, 167, 140, 0.12);
    border-color: var(--primary-light);
}

.icon-box {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--primary-main) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.25rem;
    box-shadow: 0 4px 12px rgba(125, 167, 140, 0.25);
}

.icon-box i {
    color: white;
    font-size: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   課程大綱區塊
   ======================================== */
.curriculum {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-primary);
}

.curriculum h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
}

.curriculum-list {
    max-width: 800px;
    margin: 0 auto;
}

.curriculum-item {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1.5rem;
    background-color: var(--bg-card);
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    margin-bottom: 1rem;
    transition: all var(--transition-fast);
}

@media (min-width: 640px) {
    .curriculum-item {
        flex-direction: row;
        gap: 1.5rem;
        align-items: flex-start;
    }
}

.curriculum-item:hover {
    box-shadow: 0 4px 16px rgba(125, 167, 140, 0.1);
    border-color: var(--primary-light);
}

.time {
    flex-shrink: 0;
    font-weight: 600;
    color: var(--primary-main);
    font-size: 0.95rem;
}

@media (min-width: 640px) {
    .time {
        min-width: 120px;
    }
}

.content h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   適合對象區塊
   ======================================== */
.audience {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-card);
}

.audience h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
}

.audience-grid {
    max-width: 640px;
    margin: 0 auto;
}

.audience-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    background-color: var(--bg-card-alt);
    border-radius: var(--radius-card);
    margin-bottom: 0.75rem;
    border: 1px solid var(--border-light);
    transition: all var(--transition-fast);
}

.audience-item:hover {
    border-color: var(--primary-light);
    background-color: var(--bg-primary);
}

.audience-item i {
    color: var(--primary-main);
    font-size: 1.25rem;
    flex-shrink: 0;
}

.audience-item span {
    font-size: 1rem;
    color: var(--text-primary);
    font-weight: 500;
}

/* ========================================
   講師介紹區塊
   ======================================== */
.instructor {
    padding: var(--spacing-section) 0;
    background-color: var(--bg-primary);
}

.instructor h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 2.5rem;
}

.instructor-card {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    text-align: center;
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-card);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(42, 38, 32, 0.06);
}

@media (min-width: 640px) {
    .instructor-card {
        flex-direction: row;
        gap: 2rem;
        text-align: left;
        padding: 2.5rem;
    }
}

.instructor-avatar {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    overflow: hidden;
    flex-shrink: 0;
    border: 3px solid var(--primary-light);
    box-shadow: 0 4px 12px rgba(125, 167, 140, 0.2);
}

@media (min-width: 640px) {
    .instructor-avatar {
        width: 120px;
        height: 120px;
    }
}

.instructor-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.instructor-info h3 {
    font-size: 1.75rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.instructor-title {
    color: var(--primary-main);
    font-weight: 600;
    margin-bottom: 1rem;
    font-size: 1rem;
}

.instructor-bio {
    color: var(--text-secondary);
    line-height: 1.8;
}

/* ========================================
   報名區塊
   ======================================== */
.enroll {
    padding: var(--spacing-section) 0;
    background: linear-gradient(135deg, var(--bg-card-alt) 0%, var(--bg-primary) 100%);
}

.enroll-card {
    max-width: 520px;
    margin: 0 auto;
    background-color: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-card);
    border: 2px solid var(--border-color);
    box-shadow: 0 12px 40px rgba(42, 38, 32, 0.1);
}

@media (min-width: 640px) {
    .enroll-card {
        padding: 2.5rem;
    }
}

.enroll-card h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.price-highlight {
    text-align: center;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border-light);
}

.amount {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-dark);
}

.duration {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

.enroll-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    font-size: 0.95rem;
    color: var(--text-primary);
}

.form-group input {
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-button);
    font-size: 1rem;
    font-family: var(--font-main);
    background-color: var(--bg-card-alt);
    color: var(--text-primary);
    transition: all var(--transition-fast);
}

.form-group input::placeholder {
    color: var(--text-muted);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-main);
    background-color: var(--bg-card);
    box-shadow: 0 0 0 3px rgba(125, 167, 140, 0.15);
}

.btn-submit {
    background: linear-gradient(135deg, var(--primary-main) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 1rem;
    border: none;
    border-radius: var(--radius-button);
    font-size: 1.125rem;
    font-weight: 600;
    font-family: var(--font-main);
    cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 16px rgba(125, 167, 140, 0.3);
    margin-top: 0.5rem;
}

.btn-submit:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary-darker) 100%);
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(125, 167, 140, 0.4);
}

.note {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 1.5rem;
}

/* ========================================
   Footer 頁尾
   ======================================== */
footer {
    background-color: var(--bg-card);
    border-top: 1px solid var(--border-color);
    padding: 1.5rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========================================
   響應式設計 - 手機優先 (Mobile First)
   ======================================== */

/* 小平板 (375px 以上) */
@media (min-width: 375px) {
    .hero-content h1 {
        font-size: 2.25rem;
    }
}

/* 大平板 (768px 以上) */
@media (min-width: 768px) {
    :root {
        --spacing-section: 5rem;
    }

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

    .hero-content h1 {
        font-size: 2.75rem;
    }

    .price-tag {
        margin: 0 0 2rem 0;
    }
}

/* 桌面 (1200px 以上) */
@media (min-width: 1200px) {
    .hero-content h1 {
        font-size: 3rem;
    }

    .features h2,
    .curriculum h2,
    .audience h2,
    .instructor h2 {
        margin-bottom: 3rem;
    }
}