/* === Variables === */
:root {
    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-error: #dc2626;
    --color-error-bg: #fef2f2;
    --color-success: #16a34a;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.05);
    --radius: 8px;
    --radius-lg: 12px;
    --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-mono: "SF Mono", "Cascadia Code", "Fira Code", Consolas, monospace;
    --container: 1100px;
}

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

/* === Base === */
body {
    font-family: var(--font);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
}

main { flex: 1; }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 20px;
}

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

/* === Header === */
.site-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 16px 0;
}

.site-header .container {
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text);
    text-decoration: none;
}

.logo svg { color: var(--color-primary); }

.header-tagline {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-left: auto;
}

/* === Footer === */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 20px 0;
    margin-top: 48px;
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

/* === Hero === */
.hero {
    text-align: center;
    padding: 48px 0 32px;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-text);
    margin-bottom: 8px;
}

.hero-text {
    color: var(--color-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* === Category Sections === */
.category-section {
    margin-bottom: 40px;
}

.category-heading {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
    padding-bottom: 8px;
    border-bottom: 2px solid var(--color-border);
}

.category-icon {
    display: flex;
    align-items: center;
    color: var(--color-primary);
}

.category-icon svg {
    width: 22px;
    height: 22px;
}

/* === Tools Grid === */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
}

.tool-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 18px;
    padding-right: 40px;
    text-decoration: none;
    color: var(--color-text);
    transition: box-shadow 0.2s, border-color 0.2s, transform 0.15s;
    position: relative;
}

.tool-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    text-decoration: none;
}

.tool-card-name {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.tool-card-desc {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.4;
}

/* Favorite star */
.fav-star {
    position: absolute;
    top: 10px;
    right: 10px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    line-height: 1;
    font-size: 1.1rem;
    color: var(--color-border);
    transition: color 0.2s, transform 0.15s;
    z-index: 2;
}

.fav-star:hover {
    transform: scale(1.2);
    color: #facc15;
}

.fav-star.active {
    color: #facc15;
}

/* Favorites section */
.favorites-section {
    display: none;
}

.favorites-section.has-favorites {
    display: block;
}

/* === Tool Page === */
.tool-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 0;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 20px;
}

.back-link:hover { color: var(--color-primary); text-decoration: none; }

.tool-page h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.tool-tagline {
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

/* === Forms === */
.tool-form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 20px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    font-size: 0.9375rem;
    font-family: var(--font-mono);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-bg);
    color: var(--color-text);
    transition: border-color 0.2s, box-shadow 0.2s;
    resize: vertical;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-control-color {
    height: 44px;
    padding: 4px;
    cursor: pointer;
}

select.form-control {
    font-family: var(--font);
    cursor: pointer;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 400;
    cursor: pointer;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 24px;
    font-size: 0.9375rem;
    font-weight: 600;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    font-family: var(--font);
}

.btn:active { transform: scale(0.98); }

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

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

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

.btn-small {
    padding: 6px 14px;
    font-size: 0.8125rem;
}

.btn-copy {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
}

.btn-copy:hover {
    background: var(--color-border);
    color: var(--color-text);
}

.btn-copy.copied {
    color: var(--color-success);
    border-color: var(--color-success);
}

/* Spinner */
.spinner {
    animation: spin 1s linear infinite;
}

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

/* === Result Area === */
.result-area {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    margin-bottom: 20px;
}

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

.result-header h3 {
    font-size: 1rem;
    font-weight: 700;
}

.result-output {
    width: 100%;
    padding: 12px;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-all;
    resize: vertical;
}

pre.result-output {
    overflow-x: auto;
    max-height: 500px;
}

.result-html {
    font-family: var(--font);
    word-break: normal;
}

.result-html table {
    width: 100%;
    border-collapse: collapse;
    margin: 8px 0;
}

.result-html th, .result-html td {
    padding: 8px 12px;
    border: 1px solid var(--color-border);
    text-align: left;
    font-size: 0.875rem;
}

.result-html th {
    background: var(--color-bg);
    font-weight: 600;
}

/* === Error Area === */
.error-area {
    background: var(--color-error-bg);
    border: 1px solid var(--color-error);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 20px;
}

.error-area p {
    color: var(--color-error);
    font-size: 0.875rem;
    font-weight: 500;
}

/* === SEO Content === */
.seo-content {
    margin-top: 40px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    line-height: 1.7;
}

.seo-content h2 {
    color: var(--color-text);
    font-size: 1.25rem;
    margin: 24px 0 8px;
}

.seo-content h2:first-child {
    margin-top: 0;
}

.seo-content p {
    margin-bottom: 12px;
}

.seo-content code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85em;
}

/* === Legal Pages === */
.legal-page {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 0;
}

.legal-page h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin-bottom: 4px;
}

.legal-updated {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin-bottom: 28px;
}

.legal-content h2 {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 28px 0 8px;
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content p {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 12px;
}

.legal-content ul {
    color: var(--color-text-muted);
    line-height: 1.7;
    margin-bottom: 12px;
    padding-left: 24px;
}

.legal-content li {
    margin-bottom: 4px;
}

.legal-content code {
    background: var(--color-bg);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.85em;
}

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

.legal-content a:hover {
    text-decoration: underline;
}

.cookie-table {
    width: 100%;
    border-collapse: collapse;
    margin: 12px 0 20px;
}

.cookie-table th,
.cookie-table td {
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    text-align: left;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.cookie-table th {
    background: var(--color-bg);
    font-weight: 600;
    color: var(--color-text);
}

/* === Footer Links === */
.footer-links {
    margin-top: 8px;
    font-size: 0.8125rem;
}

.footer-links a {
    color: var(--color-text-muted);
    text-decoration: none;
}

.footer-links a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* === 404 === */
.error-page {
    text-align: center;
    padding: 80px 0;
}

.error-page h1 {
    font-size: 5rem;
    font-weight: 800;
    color: var(--color-border);
    margin-bottom: 8px;
}

.error-page p {
    color: var(--color-text-muted);
    margin-bottom: 24px;
    font-size: 1.1rem;
}

/* === Responsive === */
@media (max-width: 900px) {
    .tools-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 640px) {
    .tools-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero h1 { font-size: 1.5rem; }
    .hero-text { font-size: 1rem; }
    .tool-page h1 { font-size: 1.35rem; }

    .tool-form {
        padding: 16px;
    }

    .site-header .container {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .header-tagline {
        margin-left: 0;
    }
}

@media (max-width: 400px) {
    .tools-grid {
        grid-template-columns: 1fr;
    }
}