:root {
    --primary: #2f81f7;
    --primary-dark: #58a6ff;
    --primary-light: #1f6feb;
    --secondary: #238636;
    --accent: #a371f7;
    
    --bg-canvas: #0d1117;
    --bg-canvas-subtle: #161b22;
    --bg-canvas-inset: #010409;
    --border-default: #30363d;
    --border-muted: #21262d;
    
    --fg-default: #c9d1d9;
    --fg-muted: #8b949e;
    --fg-subtle: #6e7681;
    --fg-on-emphasis: #ffffff;
    
    --success: #238636;
    --warning: #d29922;
    --error: #f85149;
    --attention: #bb8009;
    
    --shadow-sm: 0 1px 0 rgba(27, 31, 35, 0.04);
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.12), 0 1px 2px rgba(0, 0, 0, 0.24);
    --shadow-md: 0 3px 6px rgba(0, 0, 0, 0.16), 0 3px 6px rgba(0, 0, 0, 0.23);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.19), 0 6px 6px rgba(0, 0, 0, 0.23);
    --shadow-xl: 0 14px 28px rgba(0, 0, 0, 0.25), 0 10px 10px rgba(0, 0, 0, 0.22);
    
    --radius-sm: 4px;
    --radius: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;
    
    --transition: 0.2s cubic-bezier(0.3, 0, 0.5, 1);
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    background-color: var(--bg-canvas);
    color: var(--fg-default);
    line-height: 1.5;
    min-height: 100vh;
}

a {
    color: var(--primary-dark);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1012px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.header {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem 0 3rem;
    border-bottom: 1px solid var(--border-muted);
    margin-bottom: 2rem;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--fg-default);
    font-size: 1.5rem;
    font-weight: 600;
}

.logo:hover {
    text-decoration: none;
    color: var(--fg-on-emphasis);
}

.logo-icon {
    font-size: 2rem;
}

.tagline {
    color: var(--fg-muted);
    font-size: 1.1rem;
    margin-top: 0.5rem;
}

.main {
    flex: 1;
}

.hero {
    text-align: center;
    padding: 1rem 0 3rem;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 600;
    color: var(--fg-on-emphasis);
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -0.5px;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--fg-muted);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

.form-section {
    background-color: var(--bg-canvas-subtle);
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
    padding: 2rem;
    margin-bottom: 3rem;
}

.analyze-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

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

.input-label {
    font-weight: 600;
    color: var(--fg-default);
    font-size: 0.9rem;
}

.url-input {
    width: 100%;
    padding: 5px 12px;
    font-size: 1rem;
    line-height: 20px;
    color: var(--fg-default);
    background-color: var(--bg-canvas-inset);
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
    outline: none;
    box-shadow: var(--shadow-sm);
    transition: 80ms cubic-bezier(0.33, 1, 0.68, 1);
    transition-property: color, background-color, box-shadow, border-color;
    height: 40px;
}

.url-input:focus {
    border-color: var(--primary-dark);
    box-shadow: 0 0 0 3px rgba(56, 139, 253, 0.3);
}

.url-input::placeholder {
    color: var(--fg-subtle);
}

.submit-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 5px 16px;
    font-size: 1rem;
    font-weight: 600;
    line-height: 20px;
    white-space: nowrap;
    vertical-align: middle;
    cursor: pointer;
    user-select: none;
    border: 1px solid rgba(240, 246, 252, 0.1);
    border-radius: var(--radius);
    background-color: #238636;
    color: var(--fg-on-emphasis);
    transition: .2s cubic-bezier(0.3, 0, 0.5, 1);
    height: 40px;
}

.submit-btn:hover:not(:disabled) {
    background-color: #2ea043;
    border-color: rgba(240, 246, 252, 0.1);
}

.submit-btn:disabled {
    background-color: #238636;
    border-color: rgba(240, 246, 252, 0.1);
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.spinner {
    width: 1rem;
    height: 1rem;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.examples {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-muted);
}

.examples-label {
    font-size: 0.85rem;
    color: var(--fg-muted);
    margin-bottom: 0.75rem;
}

.example-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.example-btn {
    padding: 3px 12px;
    font-size: 0.85rem;
    line-height: 20px;
    color: var(--fg-default);
    background-color: var(--bg-canvas-subtle);
    border: 1px solid var(--border-default);
    border-radius: 2em;
    cursor: pointer;
    transition: 0.2s;
}

.example-btn:hover {
    background-color: var(--border-default);
    border-color: var(--fg-muted);
    color: var(--fg-on-emphasis);
}

.features {
    padding: 2rem 0;
}

.features h2 {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--fg-on-emphasis);
    margin-bottom: 2rem;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background-color: var(--bg-canvas-subtle);
    padding: 1.5rem;
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
    text-align: center;
    transition: 0.2s;
}

.feature-card:hover {
    border-color: var(--fg-muted);
}

.feature-card.highlight {
    background: linear-gradient(135deg, rgba(56, 139, 253, 0.15) 0%, rgba(56, 139, 253, 0.05) 100%);
    border: 1px solid var(--primary-dark);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--fg-on-emphasis);
    margin-bottom: 0.5rem;
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--fg-muted);
}

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

.back-link {
    display: inline-block;
    color: var(--primary-dark);
    font-size: 0.9rem;
    margin-bottom: 1rem;
}

.repo-info {
    background-color: var(--bg-canvas-subtle);
    padding: 1.5rem;
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
}

.repo-name {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--fg-default);
}

.repo-name a {
    color: var(--primary-dark);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.repo-name a:hover {
    text-decoration: underline;
}

.repo-name strong {
    font-weight: 600;
}

.external-icon {
    font-size: 0.9rem;
    color: var(--fg-muted);
}

.repo-description {
    color: var(--fg-default);
    margin-top: 0.75rem;
    font-size: 1.1rem;
}

.repo-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1rem;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font-size: 0.9rem;
    color: var(--fg-muted);
}

.meta-dot {
    width: 0.75rem;
    height: 0.75rem;
    border-radius: 50%;
    border: 1px solid rgba(240, 246, 252, 0.1);
}

.results-grid {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-card {
    background-color: var(--bg-canvas-subtle);
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
    overflow: hidden;
}

.result-card.featured {
    border-color: var(--secondary);
    box-shadow: 0 0 0 1px var(--secondary);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background-color: var(--bg-canvas-inset);
    border-bottom: 1px solid var(--border-default);
}

.result-card.featured .card-header {
    background-color: rgba(35, 134, 54, 0.1);
    border-bottom-color: var(--secondary);
}

.card-icon {
    font-size: 1.25rem;
}

.card-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--fg-on-emphasis);
}

.card-content {
    padding: 1rem;
    font-size: 0.95rem;
    color: var(--fg-default);
    line-height: 1.6;
}

.result-card.featured .card-content {
    font-size: 1.1rem;
}

.structure-section {
    margin-bottom: 2rem;
}

.structure-details {
    background-color: var(--bg-canvas-subtle);
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
}

.structure-summary {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    font-weight: 600;
    color: var(--fg-default);
    cursor: pointer;
    user-select: none;
    background-color: var(--bg-canvas-inset);
}

.structure-summary:hover {
    background-color: var(--border-default);
}

.toggle-icon {
    margin-left: auto;
    font-size: 0.75rem;
    color: var(--fg-muted);
    transition: transform 0.2s;
}

.structure-details[open] .toggle-icon {
    transform: rotate(180deg);
}

.structure-content {
    padding: 1rem;
    border-top: 1px solid var(--border-default);
    font-family: ui-monospace, SFMono-Regular, SF Mono, Menlo, Consolas, Liberation Mono, monospace;
}

.file-tree {
    list-style: none;
    padding: 0;
}

.tree-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.2rem 0;
    font-size: 0.9rem;
    color: var(--fg-muted);
}

.tree-item.is-folder {
    color: var(--fg-default);
    font-weight: 600;
}

.actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    padding: 2rem 0;
    border-top: 1px solid var(--border-muted);
    margin-top: 2rem;
}

.action-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 5px 16px;
    font-size: 0.9rem;
    font-weight: 500;
    line-height: 20px;
    border-radius: var(--radius);
    text-decoration: none;
    transition: 0.2s;
    height: 32px;
}

.action-btn.primary {
    background-color: #238636;
    color: white;
    border: 1px solid rgba(240, 246, 252, 0.1);
}

.action-btn.primary:hover {
    background-color: #2ea043;
    text-decoration: none;
}

.action-btn.secondary {
    background-color: var(--bg-canvas-subtle);
    color: var(--fg-default);
    border: 1px solid var(--border-default);
}

.action-btn.secondary:hover {
    background-color: var(--border-default);
    border-color: var(--fg-muted);
    text-decoration: none;
}

.error-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 60vh;
}

.error-card {
    background-color: var(--bg-canvas-subtle);
    border: 1px solid var(--border-default);
    border-radius: var(--radius);
    padding: 2.5rem;
    text-align: center;
    max-width: 500px;
    width: 100%;
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    display: block;
}

.error-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--fg-on-emphasis);
    margin-bottom: 1rem;
}

.error-message {
    color: var(--fg-muted);
    font-size: 1rem;
    margin-bottom: 2rem;
}

.error-help {
    background-color: rgba(187, 128, 9, 0.15);
    border: 1px solid var(--attention);
    border-radius: var(--radius);
    padding: 1rem;
    margin-bottom: 2rem;
    text-align: left;
}

.error-help p {
    font-size: 0.9rem;
    color: var(--fg-default);
    margin-bottom: 0.5rem;
}

.error-help code {
    display: block;
    background-color: rgba(0,0,0,0.3);
    padding: 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--fg-default);
    font-family: monospace;
    margin-top: 0.5rem;
}

.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: auto;
    border-top: 1px solid var(--border-muted);
}

.footer p {
    font-size: 0.8rem;
    color: var(--fg-muted);
}

.footer-note {
    margin-top: 0.5rem;
    color: var(--fg-subtle);
}

.warning-banner {
    background-color: rgba(187, 128, 9, 0.15);
    border: 1px solid var(--attention);
    color: #e3b341;
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
    text-align: center;
}

.warning-banner a {
    color: var(--fg-on-emphasis);
    font-weight: 600;
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .example-links {
        justify-content: center;
    }
}