@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #3B82F6;
    --primary-hover: #2563EB;
    --secondary: #10B981;
    --dark: #0F172A;
    --muted: #64748B;
    --white: #FFFFFF;
    --canvas: #F8FAFC;
    --border: #E2E8F0;
    --shadow: 0 4px 24px rgba(15, 23, 42, 0.08);
    --shadow-hover: 0 8px 40px rgba(15, 23, 42, 0.12);
    --font: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --dark: #F1F5F9;
    --muted: #94A3B8;
    --white: #1E293B;
    --canvas: #0F172A;
    --border: #334155;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 8px 40px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: var(--font);
    background: var(--canvas);
    color: var(--dark);
    line-height: 1.6;
    padding-bottom: 60px;
    -webkit-font-smoothing: antialiased;
    transition: background 0.3s, color 0.3s;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 24px;
}

header {
    background: var(--white);
    padding: 16px 0;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    transition: background 0.3s, border-color 0.3s;
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--dark);
    transition: color 0.3s;
}

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

nav {
    display: flex;
    align-items: center;
    gap: 10px;
}

nav a {
    color: var(--muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    margin-left: 24px;
    transition: color var(--transition);
}

nav a:hover {
    color: var(--primary);
}

.hero {
    padding: 48px 0 32px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.6rem;
    font-weight: 800;
    letter-spacing: -1px;
    color: var(--dark);
    line-height: 1.2;
    transition: color 0.3s;
}

.hero .subtitle {
    font-size: 1.1rem;
    color: var(--muted);
    margin-top: 8px;
    font-weight: 400;
    transition: color 0.3s;
}

.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    padding: 20px 0 40px 0;
}

.tool-card {
    background: var(--white);
    padding: 24px 16px;
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--dark);
    box-shadow: var(--shadow);
    transition: transform var(--transition), box-shadow var(--transition), background 0.3s, color 0.3s, border-color 0.3s;
    text-align: center;
    border: 1px solid transparent;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.tool-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.tool-card.hidden {
    display: none;
}

.tool-icon {
    font-size: 2rem;
    color: var(--dark);
    margin-bottom: 10px;
    display: block;
    transition: color var(--transition), color 0.3s;
}

.tool-card:hover .tool-icon {
    color: var(--primary);
}

.tool-card h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.tool-card p {
    font-size: 0.85rem;
    color: var(--muted);
}

footer {
    background: var(--white);
    padding: 24px 0;
    margin-top: 40px;
    border-top: 1px solid var(--border);
    text-align: center;
    transition: background 0.3s, border-color 0.3s;
}

.footer-links {
    margin-bottom: 8px;
}

.footer-links a {
    color: var(--muted);
    text-decoration: none;
    margin: 0 12px;
    font-size: 0.85rem;
    transition: color var(--transition);
}

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

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

.tool-area {
    background: var(--white);
    padding: 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    margin: 24px 0;
    border: 1px solid rgba(226, 232, 240, 0.6);
    transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.tool-header {
    margin-bottom: 24px;
}

.tool-header h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 4px;
    transition: color 0.3s;
}

.tool-header p {
    color: var(--muted);
    font-size: 1rem;
    transition: color 0.3s;
}

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

.input-group label {
    display: block;
    font-weight: 500;
    color: var(--dark);
    margin-bottom: 6px;
    transition: color 0.3s;
}

.input-group input,
.input-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font);
    transition: all var(--transition), background 0.3s, border-color 0.3s, color 0.3s;
    background: var(--canvas);
    color: var(--dark);
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
    background: var(--white);
}

.input-group textarea {
    resize: vertical;
    min-height: 120px;
}

.primary-btn {
    padding: 12px 28px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition), background 0.3s, color 0.3s;
    font-family: var(--font);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.primary-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(59, 130, 246, 0.3);
}

.primary-btn:active {
    transform: scale(0.97);
}

.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 16px 0;
}

.button-group button {
    padding: 10px 20px;
    background: var(--dark);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition), background 0.3s, color 0.3s;
    font-family: var(--font);
}

.button-group button:hover {
    background: #1e293b;
    transform: translateY(-1px);
}

.button-group button:active {
    transform: scale(0.97);
}

.clear-btn {
    background: var(--muted) !important;
}

.clear-btn:hover {
    background: #475569 !important;
}

.copy-btn {
    padding: 10px 20px;
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition), background 0.3s, color 0.3s;
    font-family: var(--font);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.copy-btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3);
}

.output-area {
    margin-top: 16px;
}

.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
    flex-wrap: wrap;
    gap: 8px;
}

.output-header label {
    font-weight: 500;
    color: var(--dark);
    transition: color 0.3s;
}

.output-area textarea {
    width: 100%;
    padding: 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: var(--font);
    resize: vertical;
    background: var(--canvas);
    min-height: 120px;
    transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.output-area textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

.result-area {
    margin-top: 20px;
    padding: 20px;
    background: var(--canvas);
    border-radius: var(--radius);
    display: none;
    flex-wrap: wrap;
    gap: 16px;
    transition: background 0.3s;
}

.result-item {
    text-align: center;
    flex: 1;
    min-width: 80px;
}

.result-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    transition: color 0.3s;
}

.result-label {
    font-size: 0.85rem;
    color: var(--muted);
    font-weight: 500;
    transition: color 0.3s;
}

.seo-content {
    margin: 40px 0;
    padding: 32px;
    background: var(--white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border: 1px solid rgba(226, 232, 240, 0.6);
    transition: background 0.3s, border-color 0.3s, color 0.3s;
}

.seo-content h2 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
    transition: color 0.3s;
}

.seo-content h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: #1e293b;
    margin-top: 16px;
    transition: color 0.3s;
}

.seo-content ul {
    margin-left: 20px;
    color: var(--muted);
    transition: color 0.3s;
}

.seo-content p {
    color: var(--muted);
    line-height: 1.8;
    transition: color 0.3s;
}

@media (max-width: 600px) {
    .hero {
        padding: 32px 0 20px 0;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero .subtitle {
        font-size: 1rem;
    }

    .logo-text {
        font-size: 1.2rem;
    }

    nav a {
        font-size: 0.8rem;
        margin-left: 12px;
    }

    .filter-bar {
        flex-direction: column;
        gap: 8px;
        margin: 16px 0 20px 0;
    }

    .filter-bar input,
    .filter-bar select {
        width: 100%;
        font-size: 0.9rem;
    }

    .tools-grid {
        gap: 12px;
        padding: 12px 0 24px 0;
    }

    .tool-card {
        padding: 16px 10px;
        border-radius: 12px;
    }

    .tool-icon {
        font-size: 1.5rem;
    }

    .tool-card h3 {
        font-size: 0.85rem;
    }

    .tool-card p {
        font-size: 0.75rem;
    }

    .primary-btn {
        width: 100%;
        justify-content: center;
        padding: 12px 20px;
    }

    .button-group button {
        flex: 1 1 40%;
        font-size: 0.75rem;
        padding: 8px 12px;
    }

    .tool-area {
        padding: 20px;
    }

    .tool-header h2 {
        font-size: 1.4rem;
    }

    .result-number {
        font-size: 1.4rem;
    }

    .seo-content {
        padding: 20px;
    }

    footer {
        padding: 16px 0;
        margin-top: 24px;
    }

    .footer-text {
        font-size: 0.7rem;
    }
}