:root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #12172a;
    --bg-tertiary: #1a2035;
    --bg-hover: #222842;
    --text-primary: #e4e7eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent-primary: #3b82f6;
    --accent-hover: #2563eb;
    --accent-glow: rgba(59, 130, 246, 0.15);
    --border-color: #2d3548;
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4);
    --transition: all 0.2s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 260px;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
}

.sidebar-header {
    padding: 1.5rem 1.25rem;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    color: var(--accent-primary);
}

.app-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    flex: 1;
    padding: 1rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 0.5rem;
    transition: var(--transition);
    font-weight: 500;
}

.nav-item svg {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.nav-item:hover {
    background: var(--bg-hover);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-glow);
    color: var(--accent-primary);
    font-weight: 600;
}

.sidebar-footer {
    padding: 1rem 1.25rem;
    border-top: 1px solid var(--border-color);
}

.status-indicator {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.content-header {
    padding: 1.5rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.search-container {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 0.75rem 1rem;
    transition: var(--transition);
}

.search-container:focus-within {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.search-icon {
    width: 20px;
    height: 20px;
    color: var(--text-muted);
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.search-input::placeholder {
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
}

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

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

.btn-icon.active {
    background: var(--accent-glow);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
}

/* Filter Panel */
.filter-panel {
    padding: 1rem 2rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    gap: 1.5rem;
}

.filter-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.filter-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-select {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    padding: 0.5rem 0.75rem;
    color: var(--text-primary);
    font-size: 0.875rem;
    cursor: pointer;
    outline: none;
    transition: var(--transition);
}

.filter-select:focus {
    border-color: var(--accent-primary);
}

.filter-checkbox {
    width: 16px;
    height: 16px;
    cursor: pointer;
}

/* Content Area */
.content-area {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
}

.content-area::-webkit-scrollbar {
    width: 10px;
}

.content-area::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

.content-area::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 5px;
}

.content-area::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Loading Spinner */
.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.spinner {
    width: 48px;
    height: 48px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin-bottom: 1rem;
}

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

/* Feed Cards */
.feed-grid {
    display: grid;
    gap: 1.25rem;
}

.feed-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    transition: var(--transition);
    cursor: pointer;
}

.feed-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.feed-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.feed-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.feed-title:hover {
    color: var(--accent-primary);
}

.feed-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.feed-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.badge-advisories {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
}

.badge-iocs {
    background: rgba(245, 158, 11, 0.15);
    color: var(--warning);
}

.badge-research {
    background: rgba(6, 182, 212, 0.15);
    color: var(--info);
}

.feed-source {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.feed-date {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.feed-summary {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-top: 0.75rem;
}

.feed-link {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    color: var(--accent-primary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    margin-top: 1rem;
    transition: var(--transition);
}

.feed-link:hover {
    color: var(--accent-hover);
    gap: 0.5rem;
}

.feed-link svg {
    width: 16px;
    height: 16px;
}

/* Settings Page */
.settings-container {
    max-width: 1200px;
}

.settings-header {
    margin-bottom: 2rem;
}

.settings-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.settings-subtitle {
    color: var(--text-secondary);
}

.feeds-list {
    display: grid;
    gap: 1rem;
}

.feed-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1.5rem;
}

.feed-info {
    flex: 1;
}

.feed-item-name {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.feed-item-url {
    color: var(--text-muted);
    font-size: 0.875rem;
    word-break: break-all;
}

.feed-actions {
    display: flex;
    gap: 0.5rem;
}

.btn-secondary {
    padding: 0.5rem 1rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.375rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}

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

.btn-danger {
    background: rgba(239, 68, 68, 0.15);
    color: var(--danger);
    border-color: var(--danger);
}

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

.btn-primary {
    padding: 0.75rem 1.5rem;
    background: var(--accent-primary);
    border: none;
    border-radius: 0.5rem;
    color: white;
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: var(--shadow);
}

/* Error State */
.error-message {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger);
    border-radius: 0.5rem;
    padding: 1rem 1.5rem;
    color: var(--danger);
    text-align: center;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.auth-overlay {
    position: fixed;
    inset: 0;
    background: rgba(10, 14, 26, 0.86);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    z-index: 2000;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    box-shadow: var(--shadow-lg);
    padding: 1.5rem;
}

.auth-card h2 {
    font-size: 1.35rem;
    margin-bottom: 0.4rem;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.auth-form label {
    font-size: 0.84rem;
    color: var(--text-secondary);
}

.auth-form input {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 0.5rem;
    padding: 0.65rem 0.75rem;
    outline: none;
}

.auth-form input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.auth-btn {
    margin-top: 0.25rem;
    background: var(--accent-primary);
    border: 1px solid var(--accent-primary);
    color: white;
    border-radius: 0.5rem;
    padding: 0.65rem 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.auth-btn:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.auth-btn.secondary {
    background: transparent;
    color: var(--text-primary);
    border-color: var(--border-color);
}

.auth-error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger);
    color: var(--danger);
    border-radius: 0.5rem;
    padding: 0.6rem 0.75rem;
    margin-bottom: 0.75rem;
    font-size: 0.88rem;
}

.qr-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}

.qr-container img {
    width: 180px;
    height: 180px;
    border-radius: 0.5rem;
    border: 1px solid var(--border-color);
    background: white;
}

.manual-key {
    color: var(--text-secondary);
    font-size: 0.8rem;
    word-break: break-word;
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        width: 220px;
    }
}

@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
        height: auto;
        min-height: 100vh;
    }

    .sidebar {
        position: static;
        width: 100%;
        height: auto;
        border-right: none;
        border-bottom: 1px solid var(--border-color);
    }

    .sidebar-header {
        padding: 1rem;
    }

    .nav-menu {
        padding: 0.75rem;
        flex-direction: row;
        gap: 0.5rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav-item {
        flex: 0 0 auto;
        min-width: max-content;
    }

    .sidebar-footer {
        padding: 0.75rem 1rem;
    }

    .main-content {
        min-height: 0;
    }

    .content-header {
        padding: 1rem;
        flex-wrap: wrap;
    }

    .search-container {
        width: 100%;
    }

    .header-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .filter-panel {
        padding: 1rem;
        flex-direction: column;
    }

    .content-area {
        padding: 1rem;
    }

    .auth-card {
        max-width: none;
    }
}