/* 
   style.css 
   根據「設計顧問」指令優化，採用 Zen Maru Gothic 字體與核心色 #2F2FE4 
*/

/* 1. 顏色與變數配置 (Color System) */
:root {
    /* 核心主色 */
    --primary: #2f2fe4;         
    --primary-light: #f0f0ff;   /* 用於背景與 hover */
    --primary-dark: #1e1e90;    /* 用於文字與 active */
    
    /* 語意色彩 */
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    
    /* 中性色彩 */
    --bg-main: #ffffff;
    --bg-sub: #f8fafc;
    --text-main: #0f172a;       /* 高對比深色文字 */
    --text-sub: #475569;        /* 次要及說明文字 */
    --border: #e2e8f0;
    
    /* 其他 */
    --radius: 16px;             /* 統一圓角 */
    --shadow: 0 10px 30px -10px rgba(47, 47, 228, 0.15);
    --transition: 0.2s ease;
}

/* 2. 字體與基礎設定 (Typography) */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Zen Maru Gothic', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.8;           /* 優化內文閱讀行高 */
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

code, pre {
    font-family: 'JetBrains Mono', monospace;
}

html {
    scroll-behavior: smooth;
}

/* 標題階層設定 */
h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 8vw, 4rem); }
h2 { font-size: clamp(1.75rem, 5vw, 2.5rem); text-align: center; }
h3 { font-size: 1.5rem; }

/* 3. 響應式佈局與元件 (Components) */

/* 導覽列 */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    position: fixed;
    width: 100%;
    top: 0;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
    transition: var(--transition);
}

.logo {
    font-size: 1.4rem;
    font-weight: 900;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.nav-links {
    display: none; /* 手機版預設隱藏 */
}

@media (min-width: 768px) {
    .nav-links {
        display: flex;
        align-items: center;
        gap: 2rem;
    }
}

.nav-links a {
    text-decoration: none;
    color: var(--text-sub);
    font-weight: 500;
    transition: var(--transition);
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-btn {
    background: var(--primary);
    color: #fff !important;
    padding: 0.6rem 1.5rem;
    border-radius: 50px;
}

/* 按鈕系統 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    font-weight: 700;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.primary {
    background-color: var(--primary);
    color: #ffffff;
}

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

.secondary {
    border-color: var(--primary);
    color: var(--primary);
}

.secondary:hover {
    background-color: var(--primary-light);
}

.full-width {
    width: 100%;
}

/* 主視覺區 Hero */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 20px 60px;
    background: radial-gradient(circle at 10% 20%, rgba(47, 47, 228, 0.05) 0%, transparent 40%);
}

.hero-content {
    max-width: 800px;
    text-align: center;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-sub);
    margin-bottom: 3rem;
    max-width: 600px;
    margin-inline: auto;
}

.hero-btns {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

/* 特色區 Feature Card */
.features {
    padding: 80px 5%;
    background-color: var(--bg-sub);
}

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

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-main);
    padding: 3rem 2rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    transition: var(--transition);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.icon-box {
    width: 64px;
    height: 64px;
    background: var(--primary-light);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-size: 1.5rem;
    margin: 0 auto 1.5rem;
}

/* 導師介紹 Instructor */
.instructor {
    padding: 80px 5%;
}

.instructor-container {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr;
    gap: 3rem;
    align-items: center;
    background: var(--bg-sub);
    padding: 4rem;
    border-radius: var(--radius);
}

@media (min-width: 768px) {
    .instructor-container {
        grid-template-columns: 200px 1fr;
        text-align: left;
    }
}

.instructor-image {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    overflow: hidden;
    margin: 0 auto;
    border: 4px solid var(--bg-main);
    box-shadow: var(--shadow);
}

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

.name-tag {
    color: var(--primary);
    font-weight: 700;
    font-size: 0.9rem;
    letter-spacing: 2px;
    margin-bottom: 0.5rem;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 1.5rem;
    justify-content: center;
}

@media (min-width: 768px) {
    .skill-tags { justify-content: flex-start; }
}

.skill-tags span {
    background: var(--bg-main);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.85rem;
    border: 1px solid var(--border);
}

/* 常見問題 FAQ */
.faq {
    padding: 80px 5%;
    max-width: 800px;
    margin: 0 auto;
}

.faq-container {
    margin-top: 3rem;
}

.faq-item {
    border-bottom: 1px solid var(--border);
    padding: 1.5rem 0;
    cursor: pointer;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-question h3 {
    margin-bottom: 0;
    font-size: 1.1rem;
}

.faq-toggle {
    color: var(--primary);
    transition: transform 0.3s ease;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    padding-top: 1rem;
    color: var(--text-sub);
}

.faq-item.active .faq-toggle {
    transform: rotate(180deg);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

/* 價格區 Pricing */
.pricing {
    padding: 80px 5%;
    background: var(--bg-sub);
}

.pricing-card {
    background: var(--bg-main);
    max-width: 450px;
    margin: 0 auto;
    padding: 4rem 3rem;
    border-radius: var(--radius);
    border: 2px solid var(--primary);
    text-align: center;
    position: relative;
    box-shadow: var(--shadow);
}

.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--warning);
    color: #fff;
    padding: 0.4rem 1.5rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 700;
}

.price {
    margin: 2rem 0;
}

.amount {
    font-size: 4rem;
    font-weight: 900;
    color: var(--primary);
}

.benefit-list {
    list-style: none;
    text-align: left;
    margin-bottom: 3rem;
}

.benefit-list li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 1rem;
    color: var(--text-sub);
}

.benefit-list li i {
    color: var(--success);
}

/* 4. 微動畫 (Micro-animations) */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 0.8s forwards;
}

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

/* 5. 頁尾 */
footer {
    padding: 4rem 5%;
    text-align: center;
    border-top: 1px solid var(--border);
    color: var(--text-sub);
    font-size: 0.9rem;
}

/* 手機版調整 */
@media (max-width: 480px) {
    .instructor-container {
        padding: 2rem;
    }
    .hero { padding-top: 100px; }
}