:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --secondary: #60A5FA;
    --accent: #FCD34D;
    --text: #1F2937;
    --text-light: #6B7280;
    --text-lighter: #9CA3AF;
    --bg: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --border: #E5E7EB;
    --shadow: rgba(0, 0, 0, 0.1);
    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 20px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 1.25rem;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-light);
    font-weight: 500;
    padding: 8px 0;
    position: relative;
    transition: color var(--transition);
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    display: block;
    width: 25px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

.mobile-menu-btn.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-menu-btn.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

.lang-switch {
    background: var(--bg-tertiary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 8px 16px;
    cursor: pointer;
    font-weight: 500;
    color: var(--text);
    transition: var(--transition);
}

.lang-switch:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.hero {
    padding: 140px 20px 80px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg) 100%);
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-light);
}

.feature-icon {
    width: 24px;
    height: 24px;
    color: var(--primary);
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: var(--radius);
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 20px var(--shadow);
}

.btn-secondary {
    background: var(--bg);
    color: var(--primary);
    border: 2px solid var(--primary);
}

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

.intro {
    padding: 80px 20px;
    background: var(--bg);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 50px;
    color: var(--text);
}

.intro-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.intro-card {
    background: var(--bg-secondary);
    padding: 40px 30px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
}

.intro-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px var(--shadow);
}

.intro-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.intro-icon svg {
    width: 30px;
    height: 30px;
    color: white;
}

.intro-card h3 {
    font-size: 1.25rem;
    margin-bottom: 15px;
    color: var(--text);
}

.intro-card p {
    color: var(--text-light);
}

.footer {
    margin-top: auto;
    background: var(--bg-secondary);
    padding: 30px 20px;
    text-align: center;
    border-top: 1px solid var(--border);
}

.footer p {
    color: var(--text-light);
}

.page-header {
    padding: 120px 20px 40px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg) 100%);
    text-align: center;
}

.page-title {
    font-size: 2.5rem;
    color: var(--text);
    margin-bottom: 10px;
}

.page-content {
    padding: 40px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.folder-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 25px;
}

.folder-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 25px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 15px;
}

.folder-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow);
    border-color: var(--primary);
}

.folder-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.folder-icon svg {
    width: 28px;
    height: 28px;
    color: white;
}

.folder-info {
    flex: 1;
    min-width: 0;
}

.folder-name {
    font-weight: 600;
    color: var(--text);
    margin-bottom: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.folder-meta {
    font-size: 0.875rem;
    color: var(--text-light);
}

.folder-locked {
    color: var(--accent);
}

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

.photo-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition);
}

.photo-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px var(--shadow);
}

.photo-thumb {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    background: var(--bg-tertiary);
}

.photo-info {
    padding: 15px;
}

.photo-name {
    font-weight: 500;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.875rem;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: var(--bg);
    border-radius: var(--radius);
    padding: 30px;
    max-width: 400px;
    width: 100%;
    animation: slideUp 0.3s ease;
}

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

.modal-title {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text);
}

.modal-close {
    position: absolute;
    top: 15px;
    right: 15px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
    transition: var(--transition);
}

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

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
}

.form-input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.form-error {
    color: #EF4444;
    font-size: 0.875rem;
    margin-top: 8px;
}

.form-actions {
    display: flex;
    gap: 15px;
    justify-content: flex-end;
}

.lightbox {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
}

.lightbox-image {
    max-width: 100%;
    max-height: 80vh;
    border-radius: var(--radius);
}

.lightbox-close {
    position: absolute;
    top: -40px;
    right: 0;
    background: white;
    border: none;
    width: 35px;
    height: 35px;
    border-radius: 50%;
    font-size: 1.5rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox-title {
    color: white;
    text-align: center;
    padding: 15px;
    font-size: 1rem;
}

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text);
    color: white;
    padding: 15px 30px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    transition: transform 0.3s ease;
    z-index: 3000;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}

.toast-error {
    background: #EF4444;
}

.toast-success {
    background: #10B981;
}

.back-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 30px;
    transition: var(--transition);
}

.back-btn:hover {
    gap: 12px;
}

.back-btn svg {
    width: 20px;
    height: 20px;
}

.loading {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 20px;
}

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

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--text-light);
}

.empty-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 20px;
    color: var(--text-lighter);
}

@media (max-width: 768px) {
    .mobile-menu-btn {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg);
        flex-direction: column;
        padding: 20px;
        gap: 0;
        border-bottom: 1px solid var(--border);
        transform: translateY(-100%);
        opacity: 0;
        pointer-events: none;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }
    
    .nav-menu li {
        border-bottom: 1px solid var(--border);
    }
    
    .nav-menu li:last-child {
        border-bottom: none;
    }
    
    .nav-link {
        display: block;
        padding: 15px 0;
    }
    
    .hero {
        padding: 120px 20px 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-features {
        flex-direction: column;
        gap: 15px;
    }
    
    .hero-actions {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .page-title {
        font-size: 1.75rem;
    }
    
    .folder-grid {
        grid-template-columns: 1fr;
    }
    
    .photo-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
    }
}

@media (max-width: 480px) {
    .logo-text {
        display: none;
    }
    
    .lang-switch {
        padding: 6px 12px;
        font-size: 0.875rem;
    }
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    flex-wrap: wrap;
}

.breadcrumb-link {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb-link:hover {
    text-decoration: underline;
}

.breadcrumb-separator {
    color: var(--text-lighter);
}

.breadcrumb-current {
    color: var(--text);
    font-weight: 500;
}