:root {
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f29;
    --bg-tertiary: #232936;
    --bg-hover: #2a3441;
    --border-color: #394046;
    --border-accent: #00d4aa;
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-muted: #7d8590;
    --accent-blue: #00d4aa;
    --accent-green: #22c55e;
    --accent-orange: #f59e0b;
    --accent-red: #ef4444;
    --shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 20px;
    line-height: 1.6;
}

.background-pattern {
    display: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    background: var(--bg-secondary);
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.header {
    text-align: center;
    margin-bottom: 40px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.header-icon {
    font-size: 3rem;
    margin-bottom: 16px;
    display: inline-block;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 24px;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.refresh-btn {
    background: var(--accent-blue);
    color: var(--bg-primary);
    border: none;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
}

.refresh-btn:hover {
    background: #00b894;
    transform: translateY(-1px);
}

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

.import-btn {
    background: var(--accent-orange);
    color: var(--bg-primary);
    border: none;
    padding: 12px 24px;
    font-size: 14px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow);
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-family: inherit;
}

.import-btn:hover {
    background: #e48900;
    transform: translateY(-1px);
}

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

.button-group {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-icon {
    display: inline-block;
}

.loading {
    text-align: center;
    padding: 60px 40px;
    color: var(--text-secondary);
}

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

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.error {
    background: var(--bg-tertiary);
    border: 1px solid var(--accent-red);
    border-radius: 8px;
    padding: 24px;
    margin: 24px 0;
    text-align: center;
    color: var(--text-primary);
}

.error h3 {
    color: var(--accent-red);
    margin-bottom: 12px;
}

.section {
    background: var(--bg-tertiary);
    border-radius: 8px;
    padding: 24px;
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    transition: border-color 0.2s ease;
}

.section:hover {
    border-color: var(--border-accent);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.section-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 16px;
    margin-bottom: 16px;
}

.info-item {
    background: var(--bg-secondary);
    padding: 16px;
    border-radius: 6px;
    border-left: 3px solid var(--accent-blue);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 12px;
    transition: background-color 0.2s ease;
}

.info-item:hover {
    background: var(--bg-hover);
}

.info-label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-family: 'JetBrains Mono', 'Courier New', monospace;
    font-size: 0.9rem;
    color: var(--text-secondary);
    word-break: break-all;
    line-height: 1.4;
}

.copy-btn {
    background: var(--bg-hover);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
    padding: 6px 12px;
    font-size: 11px;
    font-weight: 500;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
    white-space: nowrap;
    flex-shrink: 0;
}

.copy-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.copy-btn.success {
    background: var(--accent-green);
    color: var(--bg-primary);
    border-color: var(--accent-green);
}

.list-container {
    background: var(--bg-secondary);
    border-radius: 6px;
    padding: 16px;
    margin-top: 16px;
    border: 1px solid var(--border-color);
}

.collapsible-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 12px;
    cursor: pointer;
}

.collapsible-header:hover {
    color: var(--accent-blue);
}

.collapsible-toggle {
    font-size: 1rem;
    transition: transform 0.2s ease;
    user-select: none;
    color: var(--text-muted);
}

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

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.collapsible-content.open {
    max-height: 999999px;
}

.list-item, .header-item {
    background: var(--bg-tertiary);
    margin: 8px 0;
    padding: 12px;
    border-radius: 4px;
    border-left: 2px solid var(--accent-green);
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.85rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background-color 0.2s ease;
}

.list-item:hover, .header-item:hover {
    background: var(--bg-hover);
}

.header-name {
    color: var(--text-primary);
    font-weight: 600;
    margin-right: 8px;
    font-family: inherit;
}

.header-value {
    color: var(--text-secondary);
    flex: 1;
    font-family: 'JetBrains Mono', monospace;
}

.extension-item {
    background: var(--bg-secondary);
    margin: 12px 0;
    padding: 16px;
    border-radius: 6px;
    border-left: 3px solid var(--accent-orange);
    transition: background-color 0.2s ease;
}

.extension-item:hover {
    background: var(--bg-hover);
}

.extension-name {
    font-weight: 600;
    color: var(--accent-orange);
    margin-bottom: 8px;
    font-size: 0.95rem;
}

.extension-details {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.frame-item {
    background: var(--bg-secondary);
    margin: 12px 0;
    padding: 16px;
    border-radius: 6px;
    border-left: 3px solid #8b5cf6;
    transition: background-color 0.2s ease;
}

.frame-item:hover {
    background: var(--bg-hover);
}

.frame-type {
    font-weight: 600;
    color: #8b5cf6;
    margin-bottom: 8px;
    font-size: 1rem;
}

.frame-size {
    font-family: 'JetBrains Mono', monospace;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 24px;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 0.85rem;
}

.url {
    color: var(--accent-blue);
    text-decoration: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 12px;
    }

    .container {
        padding: 20px;
        border-radius: 8px;
    }

    .header h1 {
        font-size: 2rem;
    }

    .header p {
        font-size: 1rem;
    }

    .info-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .section {
        padding: 16px;
        margin-bottom: 16px;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .refresh-btn {
        padding: 10px 20px;
        font-size: 14px;
    }

    .import-btn {
        padding: 10px 20px;
        font-size: 14px;
    }
}

@media (max-width: 480px) {
    .header-icon {
        font-size: 2.5rem;
    }

    .header h1 {
        font-size: 1.75rem;
    }

    .info-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    .copy-btn {
        align-self: flex-end;
    }
}