/* ==========================================
   DEAP 報名網站專用 CSS 樣式表
   採用深色極光科技感設計 (Dark Theme + Neon Accent)
   ========================================== */

/* 全域 CSS 變數：方便維護主色系與字型 */
:root {
    --bg-main: #0a0e17;          /* 背景主色：極致深藍 */
    --bg-card: #131a26;          /* 卡片背景：深邃灰藍 */
    --bg-nav: rgba(10, 14, 23, 0.75); /* 導覽列背景：透明深藍 (用於毛玻璃) */
    --color-primary: #00f2fe;    /* 主色調：極光青藍 */
    --color-secondary: #4facfe;  /* 輔助色調：活力紫藍 */
    --color-text-main: #f8fafc;  /* 主文字顏色：近白色 */
    --color-text-sub: #94a3b8;   /* 次要文字顏色：淺灰藍 */
    --color-border: #1e293b;     /* 邊框顏色：暗灰 */
    --color-success: #10b981;    /* 成功狀態：翠綠色 */
    --color-error: #ef4444;      /* 錯誤狀態：鮮紅色 */
    
    --font-zh: 'Noto Sans TC', sans-serif;
    --font-en: 'Outfit', sans-serif;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ==========================================
   1. 基本樣式與重設 (Resets)
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-family: var(--font-zh);
    background-color: var(--bg-main);
    color: var(--color-text-main);
}

body {
    overflow-x: hidden;
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 0;
}

/* ==========================================
   2. 網頁版型與背景裝飾
   ========================================== */
/* 漸層文字效果 */
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 800;
}

/* 霓虹徽章 (Badge) */
.badge {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(0, 242, 254, 0.1);
    border: 1px solid rgba(0, 242, 254, 0.3);
    color: var(--color-primary);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 24px;
    animation: pulseGlow 2s infinite alternate;
}

@keyframes pulseGlow {
    0% { box-shadow: 0 0 5px rgba(0, 242, 254, 0.1); }
    100% { box-shadow: 0 0 15px rgba(0, 242, 254, 0.3); }
}

/* ==========================================
   3. 導覽列 (Navbar) 設計
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: var(--bg-nav);
    backdrop-filter: blur(12px); /* 毛玻璃模糊效果 */
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition-smooth);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    max-width: 1200px;
    height: 70px;
    margin: 0 auto;
}

.logo {
    font-family: var(--font-en), var(--font-zh);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-text-main);
    text-decoration: none;
    letter-spacing: 1px;
}

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

.nav-menu {
    display: flex;
    align-items: center;
    gap: 30px;
}

.nav-link {
    color: var(--color-text-sub);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: var(--transition-smooth);
}

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

/* 導覽列報名按鈕 */
.nav-btn {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #000 !important; /* 暗色系背景下，按鈕文字使用亮色反差 */
    font-weight: 700;
    padding: 10px 24px;
    border-radius: 50px;
    text-decoration: none;
    font-size: 0.9rem;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.2);
    transition: var(--transition-smooth);
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.4);
}

/* 行動版漢堡排 */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger .bar {
    width: 100%;
    height: 2px;
    background-color: var(--color-text-main);
    border-radius: 2px;
    transition: var(--transition-smooth);
}

/* ==========================================
   4. 英雄主視覺區 (Hero)
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 100px;
}

.hero-bg-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 242, 254, 0.15) 0%, rgba(79, 172, 254, 0.05) 50%, rgba(0, 0, 0, 0) 70%);
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 850px;
    padding: 0 20px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 900;
    line-height: 1.3;
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-sub);
    margin-bottom: 40px;
    font-weight: 300;
}

/* 按鈕共用樣式 */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 700;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #000;
    box-shadow: 0 4px 20px rgba(0, 242, 254, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 242, 254, 0.5);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-primary);
    color: var(--color-primary);
    margin-left: 15px;
}

.btn-outline:hover {
    background: rgba(0, 242, 254, 0.05);
    transform: translateY(-3px);
}

/* ==========================================
   5. 區段標頭 (Section Header)
   ========================================== */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    margin-bottom: 15px;
}

.header-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    margin: 0 auto 20px auto;
    border-radius: 2px;
}

.section-header p {
    color: var(--color-text-sub);
    font-size: 1.05rem;
}

/* ==========================================
   6. 培訓日程與地點資訊區
   ========================================== */
.schedule-info-section {
    background-color: rgba(255, 255, 255, 0.01);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.info-banner-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.info-banner-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 35px 30px;
    text-align: center;
    transition: var(--transition-smooth);
}

.info-banner-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 8px 25px rgba(0, 242, 254, 0.1);
    transform: translateY(-5px);
}

.info-card-icon {
    font-size: 2.5rem;
    margin-bottom: 15px;
}

.info-banner-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--color-text-main);
}

.highlight-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 8px;
}

.sub-text {
    color: var(--color-text-sub);
    font-size: 0.95rem;
    margin-bottom: 4px;
}

.alert-color {
    color: var(--color-secondary);
    font-weight: 500;
}

/* ==========================================
   7. 課程介紹區 (About Cards)
   ========================================== */
.about-main-content {
    max-width: 800px;
    margin: 0 auto 50px auto;
    text-align: center;
}

.about-lead {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.about-body {
    font-size: 1.05rem;
    color: var(--color-text-sub);
    line-height: 1.8;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.about-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    padding: 40px 30px;
    border-radius: 16px;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: var(--transition-smooth);
}

.about-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    border-color: rgba(0, 242, 254, 0.2);
}

.about-card:hover::before {
    opacity: 1;
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.about-card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.about-card p {
    color: var(--color-text-sub);
    font-size: 0.95rem;
}

/* ==========================================
   8. 課程大綱區 (Interactive Tabs)
   ========================================== */
.tab-control {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    margin-bottom: 40px;
}

.tab-btn {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    color: var(--color-text-sub);
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-smooth);
}

.tab-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.tab-btn.active {
    background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(79, 172, 254, 0.1));
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.1);
}

.tab-content {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    padding: 40px;
    border-radius: 16px;
    min-height: 250px;
}

.tab-pane {
    display: none;
    animation: fadeInTab 0.5s ease;
}

.tab-pane.active {
    display: block;
}

@keyframes fadeInTab {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.tab-pane h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--color-primary);
}

.tab-pane-desc {
    color: var(--color-text-sub);
    margin-bottom: 24px;
    font-size: 1rem;
}

.syllabus-list {
    list-style: none;
}

.syllabus-list li {
    position: relative;
    padding-left: 24px;
    margin-bottom: 12px;
    color: var(--color-text-main);
}

.syllabus-list li::before {
    content: "✦";
    position: absolute;
    left: 0;
    color: var(--color-secondary);
}

/* ==========================================
   9. 講師陣容區
   ========================================== */
.faculty-section {
    background-color: rgba(255, 255, 255, 0.005);
}

.faculty-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
}

.faculty-card {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    padding: 35px 28px;
    transition: var(--transition-smooth);
}

.faculty-card:hover {
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
    transform: translateY(-5px);
}

.faculty-info h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 6px;
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.title-sub {
    font-size: 0.85rem;
    color: var(--color-text-sub);
    font-weight: 400;
}

.faculty-role {
    color: var(--color-primary);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.faculty-divider {
    height: 1px;
    background-color: var(--color-border);
    margin-bottom: 18px;
}

.faculty-details {
    list-style: none;
}

.faculty-details li {
    position: relative;
    padding-left: 18px;
    font-size: 0.88rem;
    color: var(--color-text-sub);
    margin-bottom: 10px;
    line-height: 1.5;
}

.faculty-details li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: 800;
}

/* ==========================================
   10. 線上報名區 (Wizard 表單)
   ========================================== */
.register-wrapper {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    padding: 50px 40px;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.4);
    position: relative;
    overflow: hidden;
}

/* 步驟指示器 (Step Indicator) */
.step-indicator {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 50px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    z-index: 2;
}

.step-num {
    width: 40px;
    height: 40px;
    background-color: var(--bg-main);
    border: 2px solid var(--color-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-en);
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-text-sub);
    transition: var(--transition-smooth);
}

.step-text {
    font-size: 0.85rem;
    margin-top: 8px;
    color: var(--color-text-sub);
    font-weight: 600;
    transition: var(--transition-smooth);
}

.step-line {
    flex-grow: 1;
    max-width: 120px;
    height: 2px;
    background-color: var(--color-border);
    margin: -25px 15px 0 15px; /* 利用 margin 對齊線條 */
    z-index: 1;
    transition: var(--transition-smooth);
}

/* 步驟啟用與完成樣式 */
.step.active .step-num {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: #000;
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.4);
}

.step.active .step-text {
    color: var(--color-primary);
}

.step.completed .step-num {
    border-color: var(--color-success);
    background-color: var(--color-success);
    color: #000;
}

.step.completed .step-text {
    color: var(--color-success);
}

.step-line.active {
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
}

/* 表單多步驟切換 */
.form-step {
    display: none;
    animation: slideInForm 0.4s ease forwards;
}

.form-step.active {
    display: block;
}

@keyframes slideInForm {
    from { opacity: 0; transform: translateX(20px); }
    to { opacity: 1; transform: translateX(0); }
}

.form-step-title {
    font-size: 1.3rem;
    margin-bottom: 30px;
    border-left: 4px solid var(--color-primary);
    padding-left: 12px;
}

/* 輸入框網格 layout */
.input-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

/* 表單欄位 */
.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 20px;
}

.form-group label {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--color-text-main);
}

.required {
    color: var(--color-error);
    margin-left: 4px;
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group input[type="number"] {
    background-color: var(--bg-main);
    border: 1px solid var(--color-border);
    color: var(--color-text-main);
    padding: 14px 18px;
    border-radius: 8px;
    font-size: 0.95rem;
    transition: var(--transition-smooth);
}

.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 10px rgba(0, 242, 254, 0.15);
}

.form-group input::placeholder {
    color: rgba(255, 255, 255, 0.25);
}

/* 錯誤提示 */
.error-msg {
    color: var(--color-error);
    font-size: 0.8rem;
    margin-top: 6px;
    display: none;
}

.form-group.has-error input {
    border-color: var(--color-error) !important;
}

.form-group.has-error .error-msg {
    display: block;
}

/* ==========================================
   11. 報名方案選取器 (Step 2)
   ========================================== */
.plan-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.plan-card {
    background-color: var(--bg-main);
    border: 2px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    cursor: pointer;
    position: relative;
    transition: var(--transition-smooth);
}

.plan-card input[type="radio"] {
    position: absolute;
    top: 20px;
    right: 20px;
    accent-color: var(--color-primary);
}

.plan-card-content {
    display: flex;
    flex-direction: column;
}

.plan-badge {
    align-self: flex-start;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: 4px;
    background-color: #1e293b;
    color: var(--color-text-sub);
    margin-bottom: 12px;
}

.member-badge {
    background-color: rgba(79, 172, 254, 0.2);
    color: var(--color-secondary);
}

.group-badge {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--color-success);
}

.plan-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.plan-price {
    font-family: var(--font-en);
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.per-person {
    font-size: 0.9rem;
    color: var(--color-text-sub);
    font-weight: 400;
}

.plan-price-detail {
    color: var(--color-text-sub);
    font-size: 0.85rem;
}

/* 選中狀態樣式 */
.plan-card.active {
    border-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(0, 242, 254, 0.15);
    background-color: rgba(0, 242, 254, 0.02);
}

/* 團體人數輸入區 */
.group-count-group {
    background-color: var(--bg-main);
    border: 1px dashed var(--color-border);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 30px;
    animation: fadeIn 0.3s ease;
}

.input-tip {
    font-size: 0.8rem;
    color: var(--color-text-sub);
    margin-top: 6px;
}

/* 費用試算卡片 */
.fee-calculator-card {
    background-color: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    margin-top: 30px;
}

.fee-calculator-card h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 8px;
}

.fee-item {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
    color: var(--color-text-sub);
    margin-bottom: 8px;
}

.fee-divider {
    height: 1px;
    background-color: var(--color-border);
    margin: 16px 0;
}

.fee-total {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.fee-total span {
    font-size: 1.05rem;
    font-weight: 700;
}

.total-price {
    font-family: var(--font-en);
    font-size: 1.8rem;
    font-weight: 900;
    color: var(--color-primary);
}

/* ==========================================
   12. 核對與付款 (Step 3)
   ========================================== */
.review-box {
    background-color: var(--bg-main);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    margin-bottom: 30px;
}

.review-box h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--color-primary);
}

.review-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.review-item {
    font-size: 0.95rem;
    color: var(--color-text-sub);
}

.review-item strong {
    color: var(--color-text-main);
}

.text-accent {
    color: var(--color-primary) !important;
    font-weight: 700;
}

/* 付款方式選單 */
.payment-method-group {
    margin-bottom: 30px;
}

.payment-method-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 12px;
}

.payment-options {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
}

.payment-opt {
    flex: 1;
    background-color: var(--bg-main);
    border: 1px solid var(--color-border);
    padding: 14px 20px;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition-smooth);
}

.payment-opt input[type="radio"] {
    accent-color: var(--color-primary);
}

.payment-opt:hover {
    border-color: var(--color-primary);
}

/* 匯款資訊盒 */
.transfer-info {
    background-color: rgba(79, 172, 254, 0.05);
    border: 1px solid rgba(79, 172, 254, 0.2);
    border-radius: 8px;
    padding: 16px 20px;
    font-size: 0.9rem;
    animation: fadeIn 0.3s ease;
}

.transfer-info p {
    margin-bottom: 6px;
}

.alert-text {
    color: var(--color-secondary);
    font-size: 0.85rem;
    margin-top: 10px;
}

/* 同意條款 Checkbox */
.checkbox-group {
    margin-top: 30px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    font-weight: 400 !important;
}

.checkbox-label input[type="checkbox"] {
    margin-top: 5px;
    accent-color: var(--color-primary);
}

.policy-link {
    color: var(--color-primary);
    text-decoration: none;
    border-bottom: 1px dashed var(--color-primary);
}

.policy-link:hover {
    color: var(--color-secondary);
    border-color: var(--color-secondary);
}

/* ==========================================
   13. 步驟控制按鈕與送出遮罩
   ========================================== */
.form-navigation {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
    margin-top: 40px;
    border-top: 1px solid var(--color-border);
    padding-top: 24px;
}

/* 送出中遮罩 (Loading Screen) */
.loading-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(10, 14, 23, 0.9);
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 10;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s infinite linear;
    margin-bottom: 20px;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* ==========================================
   14. 報名成功感謝卡
   ========================================== */
.success-card {
    display: none;
    text-align: center;
    animation: scaleUp 0.5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

@keyframes scaleUp {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

.success-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.success-card h2 {
    font-size: 2rem;
    margin-bottom: 12px;
    color: var(--color-primary);
}

.success-card p {
    color: var(--color-text-sub);
    margin-bottom: 30px;
}

/* 虛擬收據框 */
.receipt-box {
    background-color: var(--bg-main);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px 30px;
    max-width: 500px;
    margin: 0 auto 30px auto;
    text-align: left;
}

.receipt-row {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.receipt-row:last-child {
    border-bottom: none;
}

.receipt-row span {
    color: var(--color-text-sub);
}

.receipt-row strong {
    color: var(--color-text-main);
}

.receipt-tip {
    font-size: 0.9rem;
    color: var(--color-text-sub);
    max-width: 600px;
    margin: 0 auto 30px auto;
}

/* ==========================================
   15. 隱私權條款彈出視窗 (Modal)
   ========================================== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
}

.modal-content {
    background-color: var(--bg-card);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    max-width: 600px;
    width: 100%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: slideDownModal 0.3s ease;
}

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

.modal-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
}

.close-modal {
    background: none;
    border: none;
    color: var(--color-text-sub);
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
}

.close-modal:hover {
    color: var(--color-primary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    font-size: 0.95rem;
    color: var(--color-text-sub);
    line-height: 1.7;
}

.modal-body p {
    margin-bottom: 16px;
}

.modal-body ul {
    margin-left: 20px;
    margin-bottom: 16px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
    display: flex;
    justify-content: flex-end;
}

/* ==========================================
   16. 頁尾 (Footer)
   ========================================== */
.footer {
    background-color: #05070a;
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-sub);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 40px;
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 60px 0;
}

.footer-about {
    flex: 1 1 300px;
}

.footer-about h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--color-text-main);
}

.footer-contact {
    flex: 1 1 400px;
}

.footer-contact h4 {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--color-text-main);
}

.footer-contact p {
    margin-bottom: 8px;
}

.footer-bottom {
    text-align: center;
    padding: 24px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    font-size: 0.8rem;
}

/* ==========================================
   17. 響應式切換 (RWD Breakpoints)
   ========================================== */
@media (max-width: 768px) {
    .nav-menu {
        display: none; /* 隱行動版選單，由 JS 接管 */
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background-color: var(--bg-card);
        flex-direction: column;
        padding: 30px 0;
        gap: 20px;
        border-bottom: 1px solid var(--color-border);
    }
    
    .nav-menu.active {
        display: flex;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hamburger.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .hamburger.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    .hero h1 {
        font-size: 2.2rem;
    }

    .hero-desc {
        font-size: 1rem;
    }

    .hero-actions {
        display: flex;
        flex-direction: column;
        gap: 15px;
        align-items: center;
    }

    .btn-outline {
        margin-left: 0;
        width: 100%;
        max-width: 250px;
    }

    .btn-primary {
        width: 100%;
        max-width: 250px;
    }

    .tab-btn {
        flex: 1 1 45%;
        padding: 10px 16px;
        font-size: 0.85rem;
    }

    .tab-content {
        padding: 24px;
    }

    .register-wrapper {
        padding: 30px 20px;
    }

    .step-indicator {
        margin-bottom: 30px;
    }

    .step-text {
        font-size: 0.75rem;
    }

    .step-line {
        margin: -20px 5px 0 5px;
    }
    
    .payment-options {
        flex-direction: column;
        gap: 10px;
    }
}

/* 共用淡入動畫 */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}