/* ========================================
   LuvTool.com — Main Stylesheet
   Modern, clean, responsive
   ======================================== */

:root {
    --primary: #e63946;
    --primary-dark: #c1121f;
    --primary-light: #fce4e6;
    --secondary: #1d3557;
    --secondary-light: #457b9d;
    --accent: #a8dadc;
    --bg: #ffffff;
    --bg-alt: #f8f9fa;
    --bg-dark: #0f172a;
    --text: #1e293b;
    --text-muted: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;
    --border-light: #f1f5f9;
    --radius: 12px;
    --radius-sm: 8px;
    --radius-xs: 6px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --max-width: 1200px;
    --transition: 0.2s ease;
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }
img { max-width: 100%; height: auto; }
ul { list-style: none; }
button, input, textarea, select { font-family: inherit; font-size: inherit; }

/* ─── Layout ─── */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-alt { background: var(--bg-alt); }

/* ─── Header ─── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}
.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}
.logo {
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--secondary);
    display: flex;
    align-items: center;
    gap: 6px;
}
.logo:hover { color: var(--secondary); }
.logo-icon { color: var(--primary); font-size: 1.3em; }
.nav-links {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    padding: 6px 12px;
    border-radius: var(--radius-xs);
    transition: all var(--transition);
}
.nav-links a:hover { color: var(--text); background: var(--bg-alt); }
.nav-sep { width: 1px; height: 24px; background: var(--border); margin: 0 4px; }
.nav-btn {
    display: inline-flex !important;
    align-items: center;
    padding: 8px 18px !important;
    border-radius: var(--radius-sm) !important;
    font-weight: 600 !important;
    font-size: 0.85rem !important;
}
.nav-btn-primary {
    background: var(--primary) !important;
    color: #fff !important;
}
.nav-btn-primary:hover { background: var(--primary-dark) !important; color: #fff !important; }
.nav-btn-outline {
    border: 1.5px solid var(--border) !important;
    color: var(--text) !important;
    background: transparent !important;
}
.nav-btn-outline:hover { border-color: var(--primary) !important; color: var(--primary) !important; background: transparent !important; }
.nav-link-muted { color: var(--text-muted) !important; }
.lang-switcher { display: flex; gap: 4px; margin-left: 8px; }
.lang-link {
    font-size: 0.75rem !important;
    font-weight: 600 !important;
    padding: 4px 8px !important;
    border-radius: 4px !important;
    color: var(--text-light) !important;
    background: var(--bg-alt) !important;
}
.lang-link:hover { color: var(--primary) !important; background: var(--primary-light) !important; }

/* Mobile toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: all var(--transition);
}
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ─── Hero ─── */
.hero {
    padding: 100px 0 80px;
    text-align: center;
    background: linear-gradient(135deg, var(--bg) 0%, var(--primary-light) 50%, var(--accent) 100%);
    position: relative;
    overflow: visible;
    z-index: 10;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(230,57,70,0.08) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}
.hero h1 {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    color: var(--secondary);
    max-width: 700px;
    margin: 0 auto 20px;
}
.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto 36px;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ─── Buttons ─── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    text-align: center;
    justify-content: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-secondary { background: var(--secondary); color: #fff; }
.btn-secondary:hover { background: #152a46; color: #fff; transform: translateY(-1px); }
.btn-outline { background: transparent; color: var(--secondary); border: 2px solid var(--border); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary); }
.btn-sm { padding: 8px 18px; font-size: 0.875rem; }
.btn-lg { padding: 16px 36px; font-size: 1.1rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ─── Cards ─── */
.card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    transition: all var(--transition);
}
.card:hover { box-shadow: var(--shadow); border-color: transparent; transform: translateY(-2px); }
.card-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 16px;
}
.card-icon-red { background: var(--primary-light); color: var(--primary); }
.card-icon-blue { background: #dbeafe; color: #2563eb; }
.card-icon-green { background: #dcfce7; color: #16a34a; }
.card-icon-purple { background: #f3e8ff; color: #9333ea; }
.card-icon-orange { background: #ffedd5; color: #ea580c; }
.card-icon-cyan { background: #cffafe; color: #0891b2; }
.card h3 { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--secondary); }
.card p { color: var(--text-muted); font-size: 0.9rem; line-height: 1.5; }

/* ─── Grid layouts ─── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ─── Category Section ─── */
.category-header {
    text-align: center;
    margin-bottom: 48px;
}
.category-header h2 {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--secondary);
    margin-bottom: 12px;
}
.category-header p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ─── Tool Cards ─── */
.tool-card { text-decoration: none; color: inherit; display: block; }
.tool-card:hover { color: inherit; }
.tool-card .badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 12px;
}
.badge-free { background: #dcfce7; color: #16a34a; }
.badge-premium { background: #fef3c7; color: #d97706; }
.badge-ai { background: #f3e8ff; color: #9333ea; }

/* ─── Tool Page Layout ─── */
.tool-page { padding: 40px 0 80px; }
.tool-page .container { max-width: 900px; }
.tool-header { margin-bottom: 32px; }
.tool-header h1 { font-size: 2rem; font-weight: 800; color: var(--secondary); margin-bottom: 8px; }
.tool-header p { color: var(--text-muted); font-size: 1.05rem; }
.tool-body {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
}
.tool-row { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.tool-col label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 8px;
    color: var(--secondary);
}
.tool-textarea {
    width: 100%;
    min-height: 200px;
    padding: 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', 'SF Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    resize: vertical;
    transition: border-color var(--transition);
    background: var(--bg-alt);
    color: var(--text);
}
.tool-textarea:focus { outline: none; border-color: var(--primary); background: var(--bg); }
.tool-input {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    transition: border-color var(--transition);
}
.tool-input:focus { outline: none; border-color: var(--primary); }
.tool-actions {
    display: flex;
    gap: 10px;
    margin: 20px 0;
    flex-wrap: wrap;
}
.tool-result {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 20px;
    margin-top: 16px;
    font-family: 'Fira Code', 'SF Mono', monospace;
    font-size: 0.875rem;
    line-height: 1.6;
    white-space: pre-wrap;
    word-break: break-word;
    min-height: 100px;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin: 16px 0;
}
.stat-card {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 16px;
    text-align: center;
}
.stat-card .stat-value { font-size: 1.8rem; font-weight: 800; color: var(--primary); }
.stat-card .stat-label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }

/* ─── Pricing ─── */
.pricing-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; align-items: start; }
.pricing-card {
    background: var(--bg);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    padding: 32px 24px;
    text-align: center;
    position: relative;
    transition: all var(--transition);
}
.pricing-card:hover { box-shadow: var(--shadow-lg); }
.pricing-card.popular {
    border-color: var(--primary);
    transform: scale(1.04);
}
.pricing-card.popular::before {
    content: 'Most Popular';
    position: absolute;
    top: -14px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary);
    color: #fff;
    padding: 4px 16px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
}
.pricing-card h3 { font-size: 1.2rem; font-weight: 700; color: var(--secondary); margin-bottom: 8px; }
.pricing-price { font-size: 2.8rem; font-weight: 800; color: var(--text); margin: 16px 0 4px; }
.pricing-period { color: var(--text-muted); font-size: 0.9rem; margin-bottom: 24px; }
.pricing-features { text-align: left; margin-bottom: 28px; }
.pricing-features li {
    padding: 8px 0;
    font-size: 0.9rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 10px;
}
.pricing-features li::before {
    content: '\2713';
    color: var(--primary);
    font-weight: 700;
    font-size: 0.85rem;
}

/* ─── Forms ─── */
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.85rem;
    margin-bottom: 6px;
    color: var(--secondary);
}
.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    transition: border-color var(--transition);
}
.form-control:focus { outline: none; border-color: var(--primary); }
.form-card {
    max-width: 440px;
    margin: 60px auto;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 40px;
}
.form-card h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 28px; text-align: center; color: var(--secondary); }
.form-footer { text-align: center; margin-top: 20px; font-size: 0.9rem; color: var(--text-muted); }
.alert { padding: 12px 16px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: 0.9rem; }
.alert-error { background: #fef2f2; color: #dc2626; border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: #16a34a; border: 1px solid #bbf7d0; }

/* ─── Footer ─── */
.site-footer {
    background: var(--bg-dark);
    color: #cbd5e1;
    padding: 64px 0 32px;
}
.footer-container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}
.footer-brand .logo { color: #fff; margin-bottom: 12px; display: inline-flex; }
.footer-brand p { color: #94a3b8; font-size: 0.9rem; line-height: 1.6; }
.footer-col h4 { color: #fff; font-size: 0.85rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 16px; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col a { color: #94a3b8; font-size: 0.85rem; transition: color var(--transition); }
.footer-col a:hover { color: #fff; }
.footer-bottom {
    border-top: 1px solid #1e293b;
    padding-top: 24px;
    text-align: center;
    font-size: 0.8rem;
    color: #64748b;
}

/* ─── Breadcrumb ─── */
.breadcrumb {
    display: flex;
    gap: 8px;
    align-items: center;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}
.breadcrumb a { color: var(--text-muted); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--text-light); }

/* ─── API Docs ─── */
.api-endpoint {
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    margin-bottom: 16px;
    overflow: hidden;
}
.api-endpoint-header {
    padding: 12px 16px;
    display: flex;
    align-items: center;
    gap: 12px;
    font-family: monospace;
    font-size: 0.9rem;
}
.api-method {
    padding: 4px 10px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
}
.api-method-get { background: #dcfce7; color: #16a34a; }
.api-method-post { background: #dbeafe; color: #2563eb; }
.api-endpoint-body { padding: 16px; border-top: 1px solid var(--border); }
.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 16px;
    border-radius: var(--radius-sm);
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    line-height: 1.6;
    overflow-x: auto;
}

/* ─── Select / Toggle ─── */
.tool-select {
    padding: 8px 14px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-xs);
    font-size: 0.875rem;
    background: var(--bg);
    cursor: pointer;
}
.toggle-group { display: flex; border: 1.5px solid var(--border); border-radius: var(--radius-sm); overflow: hidden; }
.toggle-btn {
    padding: 8px 18px;
    font-size: 0.85rem;
    font-weight: 600;
    border: none;
    background: var(--bg);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition);
}
.toggle-btn.active { background: var(--primary); color: #fff; }
.toggle-btn:not(:last-child) { border-right: 1px solid var(--border); }

/* ─── Responsive ─── */
@media (max-width: 1024px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .hero h1 { font-size: 2.2rem; }
    .hero p { font-size: 1rem; }
    .hero { padding: 60px 0 50px; }
    .section { padding: 50px 0; }
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .pricing-card.popular { transform: none; }
    .tool-row { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .category-header h2 { font-size: 1.7rem; }

    .mobile-toggle { display: flex; }
    .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--bg);
        border-bottom: 1px solid var(--border);
        padding: 16px 24px;
        flex-direction: column;
        align-items: stretch;
        gap: 4px;
        box-shadow: var(--shadow);
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 10px 12px; }
    .nav-sep { display: none; }
    .lang-switcher { margin: 8px 0 0; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.8rem; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .btn-lg { padding: 14px 28px; font-size: 1rem; }
    .tool-body { padding: 20px; }
    .form-card { padding: 24px; margin: 30px auto; }
}