/* ===== 基礎樣式 ===== */
:root {
    --primary-color: #0d6efd;
    --secondary-color: #6c757d;
    --dark-color: #212529;
    --light-color: #f8f9fa;
    --success-color: #198754;
    --danger-color: #dc3545;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--dark-color);
    padding-top: 56px;
    transition: background-color 0.3s ease;
}

/* ===== 深色模式 ===== */
body.dark-mode {
    background-color: #1a1a1a;
    color: #e0e0e0;
}

body.dark-mode .bg-light {
    background-color: #2d2d2d !important;
}

body.dark-mode .card {
    background-color: #2d2d2d;
    color: #e0e0e0;
    border-color: #404040;
}

body.dark-mode .form-control,
body.dark-mode .form-select {
    background-color: #1a1a1a;
    color: #e0e0e0;
    border-color: #404040;
}

body.dark-mode .text-muted {
    color: #aaa !important;
}

/* ===== 導航列 ===== */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: bold;
}

/* ===== 首頁橫幅 ===== */
.hero-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 120px 0 80px;
    min-height: 500px;
    display: flex;
    align-items: center;
}

.hero-section h1 {
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    animation: fadeInUp 1s ease-out;
}

.hero-section p {
    animation: fadeInUp 1.2s ease-out;
}

.hero-section .btn {
    animation: fadeInUp 1.4s ease-out;
}

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

/* ===== 電影卡片 ===== */
.movie-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    cursor: pointer;
    border: none;
    border-radius: 12px;
    overflow: hidden;
}

.movie-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.2);
}

.movie-card img {
    height: 300px;
    object-fit: cover;
    transition: transform 0.3s ease;
}

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

.movie-rating {
    position: absolute;
    top: 10px;
    right: 10px;
    background-color: rgba(0,0,0,0.7);
    color: #ffc107;
    padding: 5px 10px;
    border-radius: 20px;
    font-weight: bold;
}

.favorite-btn {
    position: absolute;
    top: 10px;
    left: 10px;
    background-color: rgba(255,255,255,0.9);
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.2rem;
}

.favorite-btn:hover {
    transform: scale(1.1);
}

.favorite-btn.active {
    color: var(--danger-color);
}

/* ===== 表單樣式 ===== */
.form-control:focus,
.form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.25rem rgba(13, 110, 253, 0.25);
}

.genre-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.genre-btn {
    transition: all 0.3s ease;
}

.genre-btn.active {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

/* ===== 回到頂部按鈕 ===== */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: none;
    z-index: 999;
    animation: fadeIn 0.3s;
}

#backToTop.show {
    display: block;
}

/* ===== 響應式設計 (RWD) ===== */
@media (max-width: 768px) {
    .hero-section {
        padding: 80px 0 60px;
        min-height: 400px;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .movie-card img {
        height: 250px;
    }

    .genre-buttons {
        justify-content: center;
    }
}

@media (max-width: 576px) {
    .hero-section h1 {
        font-size: 1.5rem;
    }

    .movie-card img {
        height: 200px;
    }

    #backToTop {
        width: 40px;
        height: 40px;
        bottom: 20px;
        right: 20px;
    }
}

/* ===== 動畫效果 ===== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.5s ease-in;
}

/* ===== 載入動畫 ===== */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: #fff;
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}