/* z:\@專案\AI課程\class_web\assets\css\style.css */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700&family=Outfit:wght@400;600;700&display=swap');

:root {
    /* 色彩設計：禪意古風與現代科技結合，溫暖和諧 */
    --primary-hue: 200;
    --primary: hsl(var(--primary-hue), 85%, 35%);
    --primary-light: hsl(var(--primary-hue), 85%, 95%);
    --primary-dark: hsl(var(--primary-hue), 90%, 20%);
    
    --accent-hue: 38; /* 溫暖的佛堂金黃色 */
    --accent: hsl(var(--accent-hue), 95%, 48%);
    --accent-light: hsl(var(--accent-hue), 95%, 93%);
    --accent-dark: hsl(var(--accent-hue), 100%, 30%);

    --success: #22c55e;
    --success-light: #f0fdf4;
    --danger: #ef4444;
    --danger-light: #fef2f2;
    
    --neutral-100: #ffffff;
    --neutral-200: #f8fafc;
    --neutral-300: #f1f5f9;
    --neutral-400: #cbd5e1;
    --neutral-700: #334155;
    --neutral-900: #0f172a;

    --font-main: 'Noto Sans TC', sans-serif;
    --font-heading: 'Outfit', 'Noto Sans TC', sans-serif;

    /* 樂齡友善排版參數 */
    --font-size-base: 20px;       /* 更大基礎字體，保護長輩眼睛 */
    --line-height-base: 1.8;     /* 寬鬆行高 */
    --border-radius-lg: 16px;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-premium: 0 10px 30px -10px rgba(15, 23, 42, 0.08), 0 1px 3px rgba(15, 23, 42, 0.03);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--neutral-700);
    background: radial-gradient(circle at top right, hsl(var(--primary-hue), 30%, 96%), var(--neutral-200));
    min-height: 100vh;
    padding-bottom: 80px;
}

/* 網頁容器 */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 20px;
}

/* 頁首樣式 - 質感毛玻璃 (Glassmorphism) */
.main-header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.4);
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.brand {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 28px;
    color: var(--primary-dark);
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-icon {
    font-size: 32px;
}

.user-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.user-welcome {
    font-weight: 500;
    color: var(--neutral-900);
    background-color: var(--primary-light);
    padding: 6px 16px;
    border-radius: 9999px;
    font-size: 18px;
}

/* 按鈕設計 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-main);
    font-weight: 700;
    text-decoration: none;
    border-radius: var(--border-radius-lg);
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--neutral-100);
    padding: 14px 28px;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(26, 54, 93, 0.2);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26, 54, 93, 0.3);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: var(--neutral-100);
    padding: 14px 28px;
    font-size: 20px;
    box-shadow: 0 4px 15px rgba(214, 122, 0, 0.2);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(214, 122, 0, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: 12px 26px;
    font-size: 20px;
}

.btn-outline:hover {
    background: var(--primary-light);
    transform: translateY(-2px);
}

.btn-huge {
    padding: 20px 40px;
    font-size: 24px;
    border-radius: 20px;
    width: 100%;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
}

.btn-huge:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.15);
}

/* 首頁區塊 */
.welcome-hero {
    text-align: center;
    padding: 60px 20px;
    background: linear-gradient(135deg, var(--primary-light), #e2f1fc);
    border-radius: 30px;
    margin-bottom: 40px;
    box-shadow: var(--shadow-premium);
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.welcome-hero h1 {
    font-size: 40px;
    color: var(--primary-dark);
    margin-bottom: 15px;
    font-weight: 700;
}

.welcome-hero p {
    font-size: 22px;
    color: var(--neutral-700);
    max-width: 700px;
    margin: 0 auto;
}

/* 課程大卡片 */
.sessions-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

@media (max-width: 768px) {
    .sessions-grid {
        grid-template-columns: 1fr;
    }
}

.card-session {
    background: var(--neutral-100);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--neutral-300);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    position: relative;
    overflow: hidden;
}

.card-session:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px -10px rgba(15, 23, 42, 0.12);
}

.card-session::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 8px;
    background: var(--primary);
}

.card-session.accent-top::before {
    background: var(--accent);
}

.session-number {
    font-family: var(--font-heading);
    font-size: 16px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent-dark);
    margin-bottom: 10px;
}

.session-title {
    font-size: 28px;
    color: var(--neutral-900);
    margin-bottom: 15px;
    font-weight: 700;
}

.session-desc {
    font-size: 19px;
    color: var(--neutral-700);
    margin-bottom: 30px;
    flex-grow: 1;
}

/* 鎖定狀態 */
.card-session.locked {
    opacity: 0.85;
    background: var(--neutral-200);
}

.card-session.locked::before {
    background: var(--neutral-400);
}

.lock-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    background: var(--neutral-300);
    color: var(--neutral-700);
    padding: 6px 12px;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 6px;
}

.open-time {
    font-size: 16px;
    color: var(--danger);
    font-weight: bold;
    margin-top: 15px;
    display: flex;
    align-items: center;
    gap: 6px;
}

/* 教學頁排版 */
.lesson-page-header {
    margin-bottom: 40px;
}

.lesson-content-card {
    background: var(--neutral-100);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--neutral-300);
    margin-bottom: 40px;
}

.lesson-unit {
    margin-bottom: 60px;
}

.lesson-unit h2 {
    font-size: 28px;
    color: var(--primary-dark);
    border-bottom: 2px solid var(--neutral-300);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.lesson-step {
    background: var(--neutral-200);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    margin-bottom: 24px;
    border-left: 5px solid var(--primary);
}

.lesson-step h3 {
    font-size: 22px;
    color: var(--neutral-900);
    margin-bottom: 10px;
}

.tip-box {
    background-color: var(--accent-light);
    border: 1px solid var(--accent);
    border-radius: 12px;
    padding: 16px 20px;
    margin: 15px 0;
    color: var(--accent-dark);
}

/* 提示詞複製卡片 */
.prompt-copy-card {
    background: linear-gradient(135deg, var(--primary-light), #e2f1fc);
    border: 2px dashed var(--primary);
    border-radius: var(--border-radius-lg);
    padding: 24px;
    margin: 20px 0;
}

.prompt-text {
    font-size: 22px;
    font-weight: 500;
    color: var(--primary-dark);
    background-color: var(--neutral-100);
    padding: 16px;
    border-radius: 12px;
    border: 1px solid var(--neutral-300);
    margin-bottom: 16px;
    user-select: all;
    word-break: break-all;
}

/* 實作與表單 */
.practice-box {
    background: linear-gradient(to bottom, #fff9f0, #fffcf8);
    border: 2px solid var(--accent);
    border-radius: 24px;
    padding: 40px;
    margin-top: 50px;
    box-shadow: 0 12px 30px rgba(214, 122, 0, 0.05);
}

.practice-intro {
    font-size: 22px;
    font-weight: bold;
    color: var(--accent-dark);
    margin-bottom: 30px;
}

.steps-flow {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.step-card {
    background: #ffffff;
    border-radius: 18px;
    padding: 24px;
    border: 1px solid var(--neutral-300);
    position: relative;
    padding-left: 60px;
}

.step-num {
    position: absolute;
    left: 15px;
    top: 20px;
    width: 32px;
    height: 32px;
    background: var(--accent);
    color: #ffffff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.step-card h3 {
    font-size: 22px;
    color: var(--neutral-900);
    margin-bottom: 12px;
}

.gateways {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 15px;
}

/* 樂齡表單 */
.elder-form {
    margin-top: 20px;
    background: var(--neutral-200);
    padding: 24px;
    border-radius: var(--border-radius-lg);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-weight: bold;
    margin-bottom: 8px;
    color: var(--neutral-900);
    font-size: 20px;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group select {
    width: 100%;
    padding: 14px;
    font-size: 20px;
    border: 2px solid var(--neutral-400);
    border-radius: 12px;
    font-family: var(--font-main);
    color: var(--neutral-900);
}

.form-group input[type="text"]:focus,
.form-group input[type="password"]:focus,
.form-group select:focus {
    border-color: var(--primary);
    outline: none;
}

.form-group input[type="file"] {
    font-size: 18px;
    padding: 10px 0;
}

/* 作品成果牆 */
.gallery-header {
    text-align: center;
    margin-bottom: 40px;
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 25px;
}

.gallery-item {
    background: #ffffff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--neutral-300);
    transition: var(--transition-smooth);
    display: flex;
    flex-direction: column;
}

.gallery-item:hover {
    transform: translateY(-5px);
}

.work-img-container {
    width: 100%;
    height: 240px;
    background: #e2e8f0;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

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

.work-audio-fallback {
    font-size: 48px;
    color: var(--primary);
}

.work-info {
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.work-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--neutral-900);
}

.work-author {
    font-size: 18px;
    color: var(--primary);
    font-weight: bold;
}

.work-meta {
    font-size: 15px;
    color: var(--neutral-700);
    display: flex;
    justify-content: space-between;
    border-top: 1px solid var(--neutral-300);
    padding-top: 10px;
    margin-top: 10px;
}

/* 登入畫面 */
.login-card {
    max-width: 480px;
    margin: 80px auto;
    background: #ffffff;
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--shadow-premium);
    border: 1px solid var(--neutral-300);
}

.login-title {
    text-align: center;
    font-size: 32px;
    color: var(--primary-dark);
    margin-bottom: 30px;
    font-weight: bold;
}

.alert-danger {
    background-color: var(--danger-light);
    border: 1px solid var(--danger);
    color: var(--danger);
    padding: 12px 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 18px;
}

/* 頁尾 */
.main-footer {
    text-align: center;
    padding: 30px 20px;
    font-size: 16px;
    color: var(--neutral-700);
    margin-top: 60px;
    border-top: 1px solid var(--neutral-300);
}