/* ========================================
   CSS Variables & Reset
   ======================================== */

:root {
    /* Colors - Modern Gradient Palette */
    --primary: #ccb36c;
    --primary-dark: #c8ae68;
    --primary-light: #60a5fa;
    --secondary: #c8ae68;
    --accent: #ec4899;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Grayscale */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-dark: rgba(255, 255, 255, 0.5);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
    --glass-blur: blur(12px);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Gradient Backgrounds */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-sunset: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-ocean: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-mesh: 
        radial-gradient(at 0% 0%, rgba(102, 126, 234, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(236, 72, 153, 0.15) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
        radial-gradient(at 0% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
}

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

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--gray-50);
    background-image: var(--gradient-mesh);
    color: var(--gray-900);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

[x-cloak] { 
    display: none !important; 
}

/* ========================================
   Navigation Bar - Glassmorphism
   ======================================== */

.navbar {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--gray-900);
    font-weight: 700;
    font-size: 1.25rem;
    transition: all var(--transition-base);
}

.navbar-brand:hover {
    color: var(--primary);
    transform: translateY(-2px);
}

.navbar-logo {
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
}

.navbar-title {
    font-size: 1.5rem;
    letter-spacing: 0.200em;
    color: #ccb36c;
}

/* ========================================
   Buttons - Enhanced
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 0.9375rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px; /* Touch target size */
}

.btn .btn-text {
    display: inline;
}

.btn .btn-label-mobile {
    display: none;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 14px 0 rgba(59, 130, 246, 0.4);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px 0 rgba(59, 130, 246, 0.5);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    color: var(--gray-700);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--gray-300);
}

.btn-success {
    background: linear-gradient(135deg, var(--success), #059669);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(16, 185, 129, 0.4);
}

.btn-success:hover {
    box-shadow: 0 6px 20px 0 rgba(16, 185, 129, 0.5);
    transform: translateY(-2px);
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger), #dc2626);
    color: white;
    box-shadow: 0 4px 14px 0 rgba(239, 68, 68, 0.4);
}

.btn-danger:hover {
    box-shadow: 0 6px 20px 0 rgba(239, 68, 68, 0.5);
    transform: translateY(-2px);
}

/* ========================================
   Cards - Glassmorphism
   ======================================== */

.card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    padding: 1.5rem;
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* ========================================
   Container
   ======================================== */

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* ========================================
   Hero Section
   ======================================== */

.hero {
    text-align: center;
    padding: 3rem 1rem 2rem;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.75rem;
    letter-spacing: -0.025em;
}

.hero-title i {
    -webkit-text-fill-color: var(--primary);
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* ========================================
   Tutorial Section - NEW
   ======================================== */

.tutorial-section {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.tutorial-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.tutorial-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--gray-900);
}

.tutorial-icon {
    width: 2.5rem;
    height: 2.5rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.125rem;
}

.tutorial-toggle {
    font-size: 1.25rem;
    color: var(--gray-500);
    transition: transform var(--transition-base);
}

.tutorial-toggle.open {
    transform: rotate(180deg);
}

.tutorial-content {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--glass-border);
}

.tutorial-steps {
    display: grid;
    gap: 1rem;
}

.tutorial-step {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-base);
}

.tutorial-step:hover {
    background: rgba(255, 255, 255, 0.7);
    transform: translateX(4px);
}

.tutorial-step-number {
    flex-shrink: 0;
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 0.875rem;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.3);
}

.tutorial-step-content h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-900);
    margin-bottom: 0.25rem;
}

.tutorial-step-content p {
    font-size: 0.875rem;
    color: var(--gray-600);
    line-height: 1.5;
}

.tutorial-tips {
    margin-top: 1rem;
    padding: 1rem;
    background: rgba(59, 130, 246, 0.1);
    border-radius: var(--radius-lg);
    border-left: 3px solid var(--primary);
}

.tutorial-tips-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.tutorial-tips ul {
    list-style: none;
    font-size: 0.875rem;
    color: var(--gray-700);
}

.tutorial-tips li {
    padding-left: 1.5rem;
    position: relative;
    margin-bottom: 0.25rem;
}

.tutorial-tips li:before {
    content: "•";
    position: absolute;
    left: 0.5rem;
    color: var(--primary);
    font-weight: 700;
}

/* ========================================
   Filter Section
   ======================================== */

.filter-container {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
    display: grid;
    gap: 1.5rem;
}

.search-wrapper {
    display: grid;
    gap: 0.75rem;
}

.filter-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.9375rem;
}

.filter-label i {
    color: var(--primary);
}

.search-input {
    width: 100%;
    padding: 0.875rem 1rem;
    padding-right: 3rem;
    font-size: 0.9375rem;
    font-family: 'Poppins', sans-serif;
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
    transition: all var(--transition-base);
    color: var(--gray-900);
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.search-input::placeholder {
    color: var(--gray-400);
}

.search-icon {
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--gray-400);
    pointer-events: none;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.filter-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    background: rgba(255, 255, 255, 0.6);
    border: 2px solid var(--glass-border);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--gray-700);
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}

.filter-btn:hover {
    background: rgba(255, 255, 255, 0.9);
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.filter-btn.active {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    border-color: var(--primary);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.filter-btn i {
    font-size: 0.875rem;
}

/* ========================================
   Selection Info
   ======================================== */

.selection-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.selection-count {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 600;
    font-size: 1rem;
    color: var(--gray-900);
}

.selection-count i {
    color: var(--success);
    font-size: 1.25rem;
}

.selection-actions {
    display: flex;
    gap: 0.75rem;
}

/* ========================================
   Photo Grid - Responsive Layout
   ======================================== */

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
}

.photo-card {
    position: relative;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-xl);
    border: 2px solid var(--glass-border);
    box-shadow: var(--glass-shadow);
    overflow: hidden;
    cursor: pointer;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
}

.photo-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary);
}

.photo-card.selected {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.photo-checkbox-wrapper {
    position: absolute;
    top: 0.75rem;
    right: 0.75rem;
    z-index: 20;
    cursor: pointer;
}

.photo-checkbox {
    position: absolute;
    opacity: 0;
    width: 0;
    height: 0;
}

.photo-checkmark {
    width: 2rem;
    height: 2rem;
    background: var(--glass-bg-dark);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 2px solid white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.photo-card:hover .photo-checkmark,
.photo-card.selected .photo-checkmark {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.checkmark-icon {
    color: white;
    opacity: 0;
    transform: scale(0);
    transition: all var(--transition-base);
}

.photo-card.selected .checkmark-icon {
    opacity: 1;
    transform: scale(1);
}

.photo-card-inner {
    position: relative;
}

.photo-wrapper {
    position: relative;
    aspect-ratio: 16/9; /* Landscape untuk desktop */
    overflow: hidden;
    background: var(--gray-100);
}

.photo-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.photo-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.6), transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.photo-card:hover .photo-overlay {
    opacity: 1;
}

.photo-info {
    padding: 1rem;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(8px);
}

.photo-session {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
}

.photo-session i {
    color: var(--primary);
}

.photo-selected-overlay {
    position: absolute;
    inset: 0;
    background: rgba(59, 130, 246, 0.1);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.photo-card.selected .photo-selected-overlay {
    opacity: 1;
}

/* ========================================
   Preview Modal - Glassmorphism
   ======================================== */

.preview-modal {
    position: fixed;
    inset: 0;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.preview-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.preview-container {
    position: relative;
    max-width: 900px;
    width: 100%;
    max-height: 90vh;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--glass-border);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.preview-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    width: 2.5rem;
    height: 2.5rem;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    color: white;
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 10;
    display: flex;
    align-items: center;
    justify-content: center;
}

.preview-close:hover {
    background: rgba(239, 68, 68, 0.8);
    transform: rotate(90deg);
}

.preview-image-wrapper {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow: auto;
}

.preview-image {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.preview-info-bar {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--glass-border);
    padding: 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.preview-session {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    color: var(--gray-900);
    font-size: 0.9375rem;
}

.preview-session i {
    color: var(--primary);
    font-size: 1rem;
}

.preview-actions {
    display: flex;
    gap: 0.75rem;
}

.preview-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'Poppins', sans-serif;
    border-radius: var(--radius-lg);
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    white-space: nowrap;
    -webkit-tap-highlight-color: transparent;
    min-height: 44px;
}

.preview-btn-download {
    background: rgba(255, 255, 255, 0.8);
    color: var(--gray-700);
    border: 1px solid var(--glass-border);
}

.preview-btn-download:hover {
    background: white;
    color: var(--primary);
}

.preview-btn-share {
    background: rgba(255, 255, 255, 0.8);
    color: var(--success);
    border: 1px solid var(--glass-border);
}

.preview-btn-share:hover {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.preview-btn-select {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.preview-btn-select:hover {
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.4);
    transform: translateY(-2px);
}

/* ========================================
   Empty State
   ======================================== */

.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-radius: var(--radius-xl);
    border: 1px solid var(--glass-border);
}

.empty-icon {
    width: 5rem;
    height: 5rem;
    margin: 0 auto 1.5rem;
    color: var(--gray-300);
}

.empty-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.5rem;
}

.empty-text {
    font-size: 1rem;
    color: var(--gray-600);
}

/* ========================================
   Footer
   ======================================== */

.footer {
    margin-top: 4rem;
    padding: 2rem 0;
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top: 1px solid var(--glass-border);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 1.5rem;
    text-align: center;
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* ========================================
   Animations
   ======================================== */

@keyframes slide-down {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-slide-down {
    animation: slide-down 0.3s ease-out;
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablet (992px) */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
        gap: 1.25rem;
    }
}

/* Mobile (768px) */
@media (max-width: 768px) {
    .container {
        padding: 1.5rem 1rem;
    }
    
    .navbar-container {
        padding: 0 1rem;
    }
    
    .navbar-title {
        font-size: 1.125rem;
    }
    
    .navbar-logo {
        width: 2.25rem;
        height: 2.25rem;
        font-size: 1.125rem;
    }
    
    .hero {
        padding: 2rem 1rem 1.5rem;
    }
    
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .tutorial-section {
        padding: 1.25rem;
    }
    
    .tutorial-step {
        padding: 0.875rem;
    }
    
    .filter-container {
        padding: 1.25rem;
    }
    
    .selection-info {
        flex-direction: column;
        align-items: stretch;
    }
    
    .selection-actions {
        width: 100%;
    }
    
    .selection-actions .btn {
        flex: 1;
    }
    
    .photo-grid {
        grid-template-columns: 1fr; /* 1 kolom untuk mobile */
        gap: 1rem;
    }
    
    .photo-wrapper {
        aspect-ratio: 16/9; /* Landscape tetap untuk mobile */
    }
    
    .preview-image-wrapper {
        padding: 1rem;
    }
    
    .preview-info-bar {
        flex-direction: column;
        align-items: stretch;
        padding: 1rem;
    }
    
    .preview-actions {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr 1fr;
        gap: 0.5rem;
    }
    
    .preview-btn {
        flex: 1;
        min-width: 0;
        padding: 0.625rem 0.75rem;
    }
    
    .preview-btn span {
        font-size: 0.75rem;
    }
}

/* Small Mobile (480px) */
@media (max-width: 480px) {
    .container {
        padding: 1rem;
    }
    
    .hero {
        padding: 1.5rem 0.5rem 1rem;
    }
    
    .hero-title {
        font-size: 1.5rem;
    }
    
    .hero-subtitle {
        font-size: 0.9375rem;
    }
    
    .tutorial-section,
    .filter-container {
        padding: 1rem;
    }
    
    .tutorial-steps {
        gap: 0.75rem;
    }
    
    .tutorial-step {
        gap: 0.75rem;
        padding: 0.75rem;
    }
    
    .tutorial-step-number {
        width: 1.75rem;
        height: 1.75rem;
        font-size: 0.8125rem;
    }
    
    .tutorial-step-content h4 {
        font-size: 0.9375rem;
    }
    
    .tutorial-step-content p {
        font-size: 0.8125rem;
    }
    
    .filter-buttons {
        gap: 0.5rem;
    }
    
    .filter-btn {
        font-size: 0.8125rem;
        padding: 0.5rem 1rem;
    }
    
    .btn {
        font-size: 0.875rem;
        padding: 0.625rem 1.25rem;
    }
    
    .photo-grid {
        grid-template-columns: 1fr; /* 1 kolom tetap */
        gap: 0.875rem;
    }
    
    .photo-wrapper {
        aspect-ratio: 16/9; /* Landscape tetap */
    }
    
    .photo-checkmark {
        width: 2.5rem;
        height: 2.5rem;
    }
    
    .preview-modal {
        padding: 0.5rem;
    }
    
    .preview-close {
        width: 3rem;
        height: 3rem;
        font-size: 1.5rem;
    }
    
    .preview-btn {
        font-size: 0.8125rem;
        padding: 0.625rem 0.75rem;
    }
    
    .preview-btn span {
        display: none;
    }
    
    .preview-btn i {
        font-size: 1.125rem;
    }
}

/* Touch Devices */
@media (hover: none) and (pointer: coarse) {
    .btn,
    .filter-btn,
    .photo-checkmark {
        min-height: 44px;
        min-width: 44px;
    }
    
    .photo-card:active {
        transform: scale(0.98);
    }
    
    /* Always show checkbox on touch devices */
    .photo-checkmark {
        background: rgba(255, 255, 255, 0.9);
        border-color: var(--gray-300);
    }
}