:root {
    --bg-primary: #0a0f0a;
    --bg-secondary: #0d1a0d;
    --bg-card: rgba(15, 35, 22, 0.7);
    --bg-card-hover: rgba(20, 45, 30, 0.8);
    --bg-input: rgba(10, 25, 15, 0.8);
    --border: rgba(82, 183, 136, 0.15);
    --border-hover: rgba(82, 183, 136, 0.35);
    --primary: #2d6a4f;
    --primary-hover: #40916c;
    --primary-glow: rgba(45, 106, 79, 0.4);
    --accent: #52b788;
    --accent-dim: #40916c;
    --text: #e8f5e9;
    --text-muted: #81c784;
    --text-dim: #4a7c5a;
    --error: #e57373;
    --error-bg: rgba(229, 115, 115, 0.1);
    --success: #66bb6a;
    --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body::before {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(45, 106, 79, 0.08) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(82, 183, 136, 0.05) 0%, transparent 50%);
    z-index: -1;
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-hover); }

.glass {
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.app {
    max-width: 720px;
    margin: 0 auto;
    padding: 2rem 1.25rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    text-align: center;
    margin-bottom: 2.5rem;
    padding-top: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--accent);
    filter: drop-shadow(0 0 12px var(--primary-glow));
}

.logo h1 {
    font-size: 2.25rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent), var(--primary-hover));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.5px;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.input-card {
    padding: 1.75rem;
}

.input-group {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.input-wrapper {
    flex: 1;
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 1rem;
    width: 20px;
    height: 20px;
    color: var(--text-dim);
    pointer-events: none;
}

#urlInput {
    width: 100%;
    padding: 0.875rem 3rem 0.875rem 2.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}

#urlInput:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

#urlInput::placeholder {
    color: var(--text-dim);
}

.btn-icon {
    position: absolute;
    right: 0.5rem;
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 6px;
    transition: color var(--transition), background var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-icon:hover {
    color: var(--accent);
    background: rgba(82, 183, 136, 0.1);
}

.btn-icon svg {
    width: 18px;
    height: 18px;
}

.btn-primary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-hover));
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
    white-space: nowrap;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

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

.options {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0.75rem;
}

.option-group label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.35rem;
    font-weight: 500;
}

.option-group select {
    width: 100%;
    padding: 0.6rem 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: border-color var(--transition);
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2381c784' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2rem;
}

.option-group select:focus {
    border-color: var(--accent);
}

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
}

.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.error-card {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    border-color: rgba(229, 115, 115, 0.3);
    background: var(--error-bg);
}

.error-card svg {
    width: 24px;
    height: 24px;
    color: var(--error);
    flex-shrink: 0;
}

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

.result-card {
    padding: 1.5rem;
}

.result-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.result-header svg {
    width: 24px;
    height: 24px;
    color: var(--success);
}

.result-header h3 {
    color: var(--success);
    font-size: 1.1rem;
}

.download-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 0.75rem;
    transition: border-color var(--transition);
}

.download-item:hover {
    border-color: var(--border-hover);
}

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

.download-info .filename {
    font-weight: 600;
    color: var(--text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.download-info .meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.btn-download {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.6rem 1rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--transition), transform var(--transition);
    flex-shrink: 0;
    margin-left: 1rem;
}

.btn-download:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-download svg {
    width: 16px;
    height: 16px;
}

.picker-card {
    padding: 1.5rem;
}

.picker-card h3 {
    margin-bottom: 1rem;
    color: var(--accent);
}

.picker-items {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 0.75rem;
}

.picker-item {
    position: relative;
    border-radius: var(--radius-sm);
    overflow: hidden;
    border: 2px solid var(--border);
    cursor: pointer;
    transition: border-color var(--transition), transform var(--transition);
}

.picker-item:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.picker-item img {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    display: block;
    background: var(--bg-input);
}

.picker-item .picker-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 0.5rem;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    display: flex;
    justify-content: flex-end;
}

.picker-item .btn-sm {
    padding: 0.35rem 0.65rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    text-decoration: none;
    transition: background var(--transition);
}

.picker-item .btn-sm:hover {
    background: var(--primary-hover);
}

.sites-card {
    padding: 1.5rem;
}

.sites-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
    color: var(--text-muted);
    font-size: 1rem;
}

.sites-card h3 svg {
    width: 20px;
    height: 20px;
}

.sites-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.site-tag {
    padding: 0.35rem 0.75rem;
    background: rgba(45, 106, 79, 0.15);
    border: 1px solid rgba(45, 106, 79, 0.25);
    border-radius: 20px;
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: all var(--transition);
}

.site-tag:hover {
    background: rgba(45, 106, 79, 0.3);
    color: var(--text);
}

.history-card {
    padding: 1.5rem;
}

.history-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.history-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 1rem;
}

.history-header h3 svg {
    width: 20px;
    height: 20px;
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-dim);
    cursor: pointer;
    font-size: 0.85rem;
    transition: color var(--transition);
}

.btn-text:hover {
    color: var(--error);
}

.history-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.history-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 8px;
    cursor: pointer;
    transition: border-color var(--transition);
}

.history-item:hover {
    border-color: var(--border-hover);
}

.history-item .history-url {
    flex: 1;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.history-item .history-time {
    font-size: 0.75rem;
    color: var(--text-dim);
    margin-left: 1rem;
    flex-shrink: 0;
}

.footer {
    text-align: center;
    padding: 2rem 0 1rem;
    color: var(--text-dim);
    font-size: 0.85rem;
}

.hidden {
    display: none !important;
}

@media (max-width: 600px) {
    .app {
        padding: 1.5rem 1rem;
    }
    .logo h1 {
        font-size: 1.75rem;
    }
    .input-card {
        padding: 1.25rem;
    }
    .input-group {
        flex-direction: column;
    }
    .btn-primary {
        justify-content: center;
    }
    .options {
        grid-template-columns: 1fr;
    }
    .picker-items {
        grid-template-columns: repeat(2, 1fr);
    }
}