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

:root {
    --color-bg: #0f1117;
    --color-surface: #1a1d27;
    --color-surface-hover: #222632;
    --color-border: #2a2e3b;
    --color-border-focus: #4f6ef7;
    --color-primary: #4f6ef7;
    --color-primary-hover: #6b85f9;
    --color-text: #e4e6eb;
    --color-text-secondary: #8b8fa3;
    --color-text-muted: #5c6070;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-tag-bg: #252a3a;
    --color-tag-border: #3a3f52;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --transition: 0.2s ease;
}

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

.header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 0 24px;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--color-text);
}

.logo-icon {
    font-size: 20px;
}

.logo-text {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 1.5px;
}

.nav-link {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 13px;
    padding: 6px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--color-text);
    border-color: var(--color-text-muted);
}

.main {
    flex: 1;
    max-width: 900px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
}

.hero {
    text-align: center;
    padding: 80px 0 40px;
}

.hero-title {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 8px;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    color: var(--color-text-secondary);
    font-size: 16px;
    margin-bottom: 32px;
}

.search-form {
    max-width: 700px;
    margin: 0 auto;
}

.search-input-wrapper {
    position: relative;
    margin-bottom: 16px;
}

.search-icon {
    position: absolute;
    left: 16px;
    top: 18px;
    font-size: 16px;
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 16px 16px 16px 44px;
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-size: 16px;
    font-family: inherit;
    resize: none;
    outline: none;
    transition: var(--transition);
    line-height: 1.5;
}

.search-input:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px rgba(79, 110, 247, 0.15);
}

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

.search-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 40px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    min-width: 140px;
}

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

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

.search-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.examples {
    margin-top: 24px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.examples-label {
    color: var(--color-text-muted);
    font-size: 13px;
}

.example-btn {
    background: none;
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    padding: 4px 12px;
    border-radius: var(--radius-xl);
    font-size: 12px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.example-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.search-bar-compact {
    padding: 20px 0;
    position: sticky;
    top: 56px;
    background: var(--color-bg);
    z-index: 50;
    border-bottom: 1px solid var(--color-border);
    margin-bottom: 20px;
}

.search-form-compact {
    display: flex;
    gap: 10px;
    align-items: flex-start;
}

.search-input-wrapper-compact {
    flex: 1;
    position: relative;
}

.search-input-wrapper-compact .search-icon {
    top: 10px;
    font-size: 14px;
}

.search-input-compact {
    width: 100%;
    padding: 10px 12px 10px 38px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 14px;
    font-family: inherit;
    resize: none;
    outline: none;
    transition: var(--transition);
    line-height: 1.4;
    overflow: hidden;
}

.search-input-compact:focus {
    border-color: var(--color-border-focus);
}

.search-btn-compact {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
}

.search-btn-compact:hover {
    background: var(--color-primary-hover);
}

.search-btn-compact:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.clear-btn {
    padding: 10px 16px;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.clear-btn:hover {
    border-color: var(--color-text-muted);
    color: var(--color-text);
}

.ai-filters {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    margin-bottom: 20px;
}

.ai-filters-title {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text-secondary);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.ai-filters-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.filter-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    background: var(--color-tag-bg);
    border: 1px solid var(--color-tag-border);
    border-radius: var(--radius-xl);
    font-size: 13px;
    color: var(--color-text);
}

.filter-tag-label {
    color: var(--color-text-muted);
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.ai-processing-time {
    margin-top: 10px;
    font-size: 12px;
    color: var(--color-text-muted);
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.sort-indicator {
    margin-bottom: 16px;
}

.sort-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 14px;
    background: var(--color-tag-bg);
    border: 1px solid var(--color-tag-border);
    border-radius: var(--radius-xl);
    font-size: 13px;
    color: var(--color-text-secondary);
}

.results-count {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.results-page {
    font-size: 13px;
    color: var(--color-text-muted);
}

.results-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.result-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 20px 24px;
    transition: var(--transition);
}

.result-card:hover {
    border-color: var(--color-text-muted);
    background: var(--color-surface-hover);
}

.result-title {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 12px;
    line-height: 1.4;
    color: var(--color-text);
}

.result-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px 24px;
    margin-bottom: 14px;
}

.result-meta-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--color-text-secondary);
}

.result-meta-icon {
    font-size: 14px;
    width: 18px;
    text-align: center;
    flex-shrink: 0;
}

.result-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.result-tag {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    background: var(--color-tag-bg);
    border: 1px solid var(--color-tag-border);
    border-radius: var(--radius-xl);
    font-size: 12px;
    color: var(--color-text-secondary);
}

.result-tag-icon {
    font-size: 11px;
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 6px;
    padding: 32px 0;
}

.page-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.page-btn:hover:not(:disabled) {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

.page-btn.active {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.page-ellipsis {
    color: var(--color-text-muted);
    font-size: 13px;
    padding: 0 4px;
}

.loading-overlay {
    padding: 40px 0;
}

.loading-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 24px 28px;
    max-width: 400px;
    margin: 0 auto;
}

.loading-card h3 {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 20px;
    text-align: center;
}

.progress-container {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 12px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background: var(--color-border);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--color-primary);
    border-radius: var(--radius-xl);
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 14px;
    font-weight: 700;
    color: var(--color-primary);
    min-width: 40px;
    text-align: right;
}

.progress-status {
    font-size: 12px;
    color: var(--color-text-muted);
    text-align: center;
}

.loading-steps {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.loading-step {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.loading-step.active {
    color: var(--color-text);
}

.loading-step.done {
    color: var(--color-success);
}

.step-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    flex-shrink: 0;
}

.loading-step.active .step-spinner {
    animation: spin 0.8s linear infinite;
}

.loading-step.done .step-spinner {
    border-color: var(--color-success);
    border-top-color: var(--color-success);
    animation: none;
    position: relative;
}

.loading-step.done .step-spinner::after {
    content: '✓';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 10px;
    color: var(--color-success);
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.empty-state,
.error-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-icon,
.error-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.empty-state h3,
.error-state h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.empty-state p,
.error-state p {
    color: var(--color-text-secondary);
    font-size: 14px;
}

.retry-btn {
    margin-top: 16px;
    padding: 10px 24px;
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

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

.footer {
    border-top: 1px solid var(--color-border);
    padding: 16px 24px;
    margin-top: auto;
}

.footer-content {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: var(--color-text-muted);
}

.footer-content a {
    color: var(--color-text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-content a:hover {
    color: var(--color-primary);
}

@media (max-width: 640px) {
    .hero {
        padding: 48px 0 24px;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .search-input {
        font-size: 15px;
        padding: 14px 14px 14px 42px;
    }

    .search-btn {
        width: 100%;
        padding: 14px;
    }

    .examples {
        flex-direction: column;
        gap: 6px;
    }

    .result-meta {
        grid-template-columns: 1fr;
    }

    .result-card {
        padding: 16px 18px;
    }

    .result-title {
        font-size: 15px;
    }

    .search-form-compact {
        flex-wrap: wrap;
    }

    .search-input-wrapper-compact {
        flex-basis: 100%;
    }

    .search-bar-compact {
        padding: 12px 0;
    }
}