:root {
    --primary: #1463F3;
    --primary-dark: #0F4FC5;
    --navy: #0B1B35;
    --text: #172033;
    --text-secondary: #667085;
    --border: #E5EAF2;
    --bg: #F7F9FC;
    --white: #FFFFFF;
    --success: #16A34A;
    --danger: #EF4444;
    --warning: #F59E0B;
    --radius: 14px;
    --shadow: 0 1px 2px rgba(16,24,40,.04), 0 1px 3px rgba(16,24,40,.06);
    --shadow-md: 0 4px 12px rgba(16,24,40,.08);
    font-synthesis: none;
}

[data-theme="dark"] {
    --text: #E6EAF2;
    --text-secondary: #9AA4B2;
    --border: #253045;
    --bg: #0B1220;
    --white: #121A2B;
    --navy: #060C18;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text);
    background: var(--bg);
    -webkit-font-smoothing: antialiased;
    transition: background .2s ease, color .2s ease;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; margin: 0; padding: 0; }
img { max-width: 100%; display: block; }
.container { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 24px; }
.text-primary { color: var(--primary); }

/* ---------- Header ---------- */
.site-header { background: var(--white); border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 50; }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; }
.brand-icon { width: 36px; height: 36px; border-radius: 10px; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 16px; }
.brand-text { color: var(--text); }

.main-nav { display: flex; gap: 32px; }
.main-nav a { font-weight: 500; color: var(--text-secondary); padding: 26px 0; position: relative; }
.main-nav a.active { color: var(--primary); font-weight: 600; }
.main-nav a.active::after { content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 2px; background: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn { width: 40px; height: 40px; border-radius: 10px; border: 1px solid var(--border); background: var(--white); color: var(--text); display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 15px; }
.icon-btn:hover { background: var(--bg); }
.mobile-only { display: none; }

/* ---------- Hero ---------- */
.hero { padding: 64px 0; }
.hero-inner { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: start; }
.badge { display: inline-block; background: #EAF1FE; color: var(--primary); font-size: 13px; font-weight: 600; padding: 7px 14px; border-radius: 999px; margin-bottom: 20px; }
[data-theme="dark"] .badge { background: rgba(20,99,243,.15); }
.hero-title { font-size: 52px; line-height: 1.1; font-weight: 800; margin: 0 0 20px; letter-spacing: -0.02em; }
.hero-desc { color: var(--text-secondary); font-size: 16px; line-height: 1.6; max-width: 460px; margin: 0 0 28px; }

.hero-search { display: flex; align-items: center; background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 6px 6px 6px 18px; max-width: 480px; box-shadow: var(--shadow); gap: 10px; }
.hero-search i { color: var(--text-secondary); }
.hero-search input { flex: 1; border: none; outline: none; background: transparent; font-size: 15px; padding: 10px 0; color: var(--text); }
.hero-search button { background: var(--primary); color: #fff; border: none; padding: 12px 24px; border-radius: 8px; font-weight: 600; cursor: pointer; font-size: 14px; }
.hero-search button:hover { background: var(--primary-dark); }

.hero-features { display: flex; gap: 28px; margin-top: 36px; flex-wrap: wrap; }
.feature-item { display: flex; align-items: center; gap: 10px; }
.feature-item strong { display: block; font-size: 14px; }
.feature-item span { color: var(--text-secondary); font-size: 13px; }
.feature-icon { width: 36px; height: 36px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 15px; flex-shrink: 0; }
.feature-blue { background: #EAF1FE; color: var(--primary); }
.feature-green { background: #E9F9EF; color: var(--success); }
.feature-pink { background: #FDECEF; color: #E8547B; }

.hero-tool-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.hero-tool-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; display: flex; flex-direction: column; gap: 4px; box-shadow: var(--shadow); transition: transform .15s ease, box-shadow .15s ease; }
.hero-tool-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.hero-tool-icon { width: 44px; height: 44px; border-radius: 12px; background: var(--primary); color: #fff; display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 10px; }
.hero-tool-card:nth-child(1) .hero-tool-icon { background: #16A34A; }
.hero-tool-card:nth-child(2) .hero-tool-icon { background: #7C3AED; }
.hero-tool-card:nth-child(3) .hero-tool-icon { background: #F59E0B; }
.hero-tool-card:nth-child(4) .hero-tool-icon { background: #1463F3; }
.hero-tool-card:nth-child(5) .hero-tool-icon { background: #E8547B; }
.hero-tool-card:nth-child(6) .hero-tool-icon { background: #14B8A6; }
.hero-tool-card:nth-child(7) .hero-tool-icon { background: #1463F3; }
.hero-tool-card:nth-child(8) .hero-tool-icon { background: #7C3AED; }
.hero-tool-card strong { font-size: 15px; }
.hero-tool-card span { color: var(--text-secondary); font-size: 13px; line-height: 1.4; }
.hero-view-all { text-align: center; margin-top: 20px; }
.btn-link { color: var(--primary); font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }

/* ---------- Popular Tools ---------- */
.popular-section { background: var(--white); padding: 56px 0; border-top: 1px solid var(--border); }
.section-heading { text-align: center; margin-bottom: 36px; }
.section-heading h2 { font-size: 30px; margin: 0 0 8px; font-weight: 800; }
.section-heading p { color: var(--text-secondary); margin: 0; }

.popular-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.popular-item { display: flex; align-items: center; gap: 12px; }
.popular-icon { width: 40px; height: 40px; border-radius: 10px; background: var(--bg); color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; }
.popular-item strong { display: block; font-size: 14px; }
.popular-item span { color: var(--text-secondary); font-size: 12px; }

/* ---------- Footer ---------- */
.site-footer { background: var(--navy); color: #B8C1D4; padding: 44px 0; margin-top: 40px; }
.footer-inner { display: flex; justify-content: space-between; align-items: flex-start; flex-wrap: wrap; gap: 24px; }
.site-footer .brand-text { color: #fff; }
.site-footer p { max-width: 320px; font-size: 14px; line-height: 1.6; margin-top: 10px; }
.footer-nav { display: flex; gap: 24px; }
.footer-nav a { color: #B8C1D4; font-size: 14px; }
.footer-nav a:hover { color: #fff; }
.footer-copy { font-size: 13px; color: #8894AB; }

/* ---------- Tools Page ---------- */
.tools-page { padding: 48px 0 64px; }
.tools-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; flex-wrap: wrap; margin-bottom: 24px; }
.tools-header h1 { font-size: 34px; margin: 0 0 8px; font-weight: 800; }
.tools-header p { color: var(--text-secondary); margin: 0; max-width: 480px; }
.tools-search { display: flex; align-items: center; gap: 10px; background: var(--white); border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; min-width: 320px; }
.tools-search i { color: var(--text-secondary); }
.tools-search input { border: none; outline: none; background: transparent; flex: 1; font-size: 14px; color: var(--text); }

.category-filter { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 28px; }
.filter-chip { padding: 9px 18px; border-radius: 999px; border: 1px solid var(--border); background: var(--white); font-size: 14px; font-weight: 500; color: var(--text-secondary); }
.filter-chip:hover { border-color: var(--primary); color: var(--primary); }
.filter-chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.tool-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 18px; }
.tool-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; display: flex; flex-direction: column; box-shadow: var(--shadow); height: 100%; }
.tool-icon { width: 44px; height: 44px; border-radius: 12px; background: #EAF1FE; color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 18px; margin-bottom: 14px; }
.tool-name { font-size: 16px; margin: 0 0 8px; font-weight: 700; }
.tool-desc { color: var(--text-secondary); font-size: 13px; line-height: 1.5; margin: 0 0 16px; flex: 1; }
.tool-link { color: var(--primary); font-weight: 600; font-size: 14px; display: inline-flex; align-items: center; gap: 6px; }
.tool-link i { font-size: 12px; transition: transform .15s ease; }
.tool-card:hover .tool-link i { transform: translateX(3px); }

.empty-state-box { text-align: center; padding: 64px 24px; color: var(--text-secondary); }
.empty-state-box i { font-size: 36px; margin-bottom: 16px; color: var(--border); }
.empty-state-box h3 { color: var(--text); margin: 0 0 8px; }
.empty-state { text-align: center; color: var(--text-secondary); }

.tools-footer-strip { margin-top: 56px; background: #EAF1FE; border-radius: var(--radius); padding: 28px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
[data-theme="dark"] .tools-footer-strip { background: rgba(20,99,243,.1); }
.strip-item { display: flex; align-items: flex-start; gap: 12px; }
.strip-item i { color: var(--primary); font-size: 18px; margin-top: 2px; }
.strip-item strong { display: block; font-size: 14px; margin-bottom: 2px; }
.strip-item span { font-size: 12px; color: var(--text-secondary); }

.btn-primary-link { display: inline-block; background: var(--primary); color: #fff; padding: 12px 22px; border-radius: 8px; font-weight: 600; }

/* ---------- Tool Detail Page ---------- */
.tool-detail-page { padding: 40px 0 64px; }
.breadcrumb { font-size: 13px; color: var(--text-secondary); margin-bottom: 24px; }
.breadcrumb a { color: var(--text-secondary); }
.breadcrumb a:hover { color: var(--primary); }
.breadcrumb span { color: var(--text); }
.tool-detail-head { display: flex; gap: 18px; align-items: center; margin-bottom: 28px; }
.tool-detail-icon { width: 64px; height: 64px; border-radius: 16px; background: #EAF1FE; color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 26px; flex-shrink: 0; }
.tool-detail-head h1 { margin: 0 0 6px; font-size: 28px; }
.tool-detail-head p { margin: 0; color: var(--text-secondary); }
.tool-detail-body { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; line-height: 1.7; }
.tool-detail-back { margin-top: 24px; }

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
    .hero-inner { grid-template-columns: 1fr; }
    .hero-tool-grid { grid-template-columns: repeat(3, 1fr); }
    .popular-grid { grid-template-columns: repeat(3, 1fr); }
    .tool-grid { grid-template-columns: repeat(3, 1fr); }
    .tools-footer-strip { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .main-nav { display: none; }
    .mobile-only { display: flex; }
    .hero-title { font-size: 36px; }
    .hero-tool-grid { grid-template-columns: repeat(2, 1fr); }
    .popular-grid { grid-template-columns: repeat(2, 1fr); }
    .tool-grid { grid-template-columns: repeat(2, 1fr); }
    .tools-header { flex-direction: column; }
    .tools-search { width: 100%; min-width: 0; }
}
@media (max-width: 480px) {
    .hero-tool-grid { grid-template-columns: 1fr 1fr; }
    .tool-grid { grid-template-columns: 1fr; }
    .tools-footer-strip { grid-template-columns: 1fr; }
    .hero-title { font-size: 30px; }
}

/* Mobile nav drawer */
.main-nav.open { display: flex; position: absolute; top: 72px; left: 0; right: 0; background: var(--white); flex-direction: column; padding: 12px 24px; border-bottom: 1px solid var(--border); gap: 4px; }

/* ============================================================
   About Page
   ============================================================ */
.about-page { padding: 56px 0 80px; }
.about-hero { text-align: center; max-width: 820px; margin: 0 auto 56px; }
.about-hero h1 { font-size: 42px; font-weight: 800; line-height: 1.15; margin: 16px 0 16px; letter-spacing: -0.02em; }
.about-hero p { color: var(--text-secondary); font-size: 17px; line-height: 1.65; margin: 0 auto; }

.about-stats { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px 28px; box-shadow: var(--shadow); margin-bottom: 56px; }
.about-stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
.about-stat-item strong { display: block; font-size: 34px; font-weight: 800; color: var(--primary); line-height: 1.1; margin-bottom: 6px; }
.about-stat-item span { color: var(--text-secondary); font-size: 14px; font-weight: 500; }

.about-section { margin-bottom: 56px; }
.about-section-head { text-align: center; max-width: 640px; margin: 0 auto 36px; }
.about-section-head h2 { font-size: 28px; font-weight: 800; margin: 0 0 10px; }
.about-section-head p { color: var(--text-secondary); font-size: 15px; margin: 0; }

.about-grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.about-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }

.about-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 12px; transition: transform .2s ease, box-shadow .2s ease; }
.about-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.about-card-icon { width: 50px; height: 50px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; margin-bottom: 6px; }
.icon-blue { background: #EAF1FE; color: var(--primary); }
.icon-green { background: #E9F9EF; color: var(--success); }
.icon-purple { background: #F3EBFE; color: #7C3AED; }
.icon-orange { background: #FEF3E2; color: var(--warning); }
.icon-pink { background: #FDECEF; color: #E8547B; }
.icon-teal { background: #E4F9F6; color: #14B8A6; }
.about-card h3 { font-size: 18px; font-weight: 700; margin: 0; }
.about-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.6; margin: 0; }

.mission-vision-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; margin-bottom: 56px; }
.mv-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); position: relative; overflow: hidden; }
.mv-card.mission { border-left: 4px solid var(--primary); }
.mv-card.vision { border-left: 4px solid var(--success); }
.mv-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.mv-header h3 { font-size: 20px; font-weight: 700; margin: 0; }
.mv-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.65; margin: 0; }

.cta-banner { background: linear-gradient(135deg, var(--navy) 0%, #152A50 100%); color: #fff; border-radius: var(--radius); padding: 48px; text-align: center; margin-top: 56px; position: relative; overflow: hidden; }
.cta-banner h2 { font-size: 32px; font-weight: 800; margin: 0 0 12px; }
.cta-banner p { color: #C4D1EA; font-size: 16px; max-width: 580px; margin: 0 auto 28px; line-height: 1.6; }
.cta-buttons { display: flex; justify-content: center; gap: 14px; flex-wrap: wrap; }
.btn-cta-primary { background: var(--primary); color: #fff; padding: 13px 28px; border-radius: 9px; font-weight: 600; font-size: 15px; display: inline-flex; align-items: center; gap: 8px; transition: background .15s; }
.btn-cta-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-cta-secondary { background: rgba(255,255,255,.1); color: #fff; border: 1px solid rgba(255,255,255,.2); padding: 13px 28px; border-radius: 9px; font-weight: 600; font-size: 15px; display: inline-flex; align-items: center; gap: 8px; transition: background .15s; }
.btn-cta-secondary:hover { background: rgba(255,255,255,.2); color: #fff; }

/* ============================================================
   Contact Page
   ============================================================ */
.contact-page { padding: 56px 0 80px; }
.contact-hero { text-align: center; max-width: 700px; margin: 0 auto 48px; }
.contact-hero h1 { font-size: 40px; font-weight: 800; margin: 14px 0 12px; letter-spacing: -0.02em; }
.contact-hero p { color: var(--text-secondary); font-size: 16px; line-height: 1.6; margin: 0; }

.contact-layout { display: grid; grid-template-columns: 1fr 1.6fr; gap: 32px; align-items: start; }
.contact-info-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.contact-info-card h3 { font-size: 20px; font-weight: 700; margin: 0 0 8px; }
.contact-info-card p.contact-info-desc { color: var(--text-secondary); font-size: 14px; line-height: 1.6; margin: 0 0 28px; }

.contact-details-list { display: flex; flex-direction: column; gap: 24px; margin-bottom: 32px; }
.contact-detail-item { display: flex; gap: 16px; align-items: flex-start; }
.contact-detail-icon { width: 44px; height: 44px; border-radius: 12px; background: #EAF1FE; color: var(--primary); display: flex; align-items: center; justify-content: center; font-size: 17px; flex-shrink: 0; }
.contact-detail-text strong { display: block; font-size: 14px; margin-bottom: 3px; }
.contact-detail-text span, .contact-detail-text a { color: var(--text-secondary); font-size: 13.5px; line-height: 1.5; word-break: break-word; }
.contact-detail-text a:hover { color: var(--primary); }

.contact-socials-box { border-top: 1px solid var(--border); padding-top: 24px; }
.contact-socials-box strong { display: block; font-size: 13px; text-transform: uppercase; letter-spacing: .05em; color: var(--text-secondary); margin-bottom: 12px; }
.contact-social-icons { display: flex; gap: 10px; }
.social-icon-btn { width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--border); background: var(--bg); color: var(--text); display: flex; align-items: center; justify-content: center; font-size: 15px; transition: border-color .15s, background .15s, color .15s; }
.social-icon-btn:hover { border-color: var(--primary); background: var(--primary); color: #fff; }

.contact-form-card { background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 36px; box-shadow: var(--shadow); }
.contact-form-card h2 { font-size: 22px; font-weight: 700; margin: 0 0 8px; }
.contact-form-card p.form-subtitle { color: var(--text-secondary); font-size: 14px; margin: 0 0 24px; }

.contact-form { display: flex; flex-direction: column; gap: 18px; }
.form-row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 13.5px; font-weight: 600; color: var(--text); }
.form-group label span.required { color: var(--danger); }
.form-group input, .form-group textarea { width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 9px; font-size: 14px; color: var(--text); background: var(--white); font-family: inherit; transition: border-color .15s, box-shadow .15s; }
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(20,99,243,.12); }
.form-group textarea { resize: vertical; min-height: 120px; line-height: 1.5; }

.form-alert { display: flex; align-items: flex-start; gap: 12px; padding: 14px 16px; border-radius: 10px; font-size: 14px; line-height: 1.5; margin-bottom: 20px; }
.form-alert-success { background: #E9F9EF; color: #16A34A; border: 1px solid #C6F0D3; }
.form-alert-error { background: #FDECEC; color: #EF4444; border: 1px solid #FCD2D2; }
.form-alert i { font-size: 17px; margin-top: 2px; flex-shrink: 0; }

.honeypot-field { display: none !important; visibility: hidden !important; position: absolute !important; left: -9999px !important; }

/* ============================================================
   Error Pages (404, 403, 500)
   ============================================================ */
.error-page { padding: 80px 0 100px; text-align: center; }
.error-card { max-width: 540px; margin: 0 auto; background: var(--white); border: 1px solid var(--border); border-radius: var(--radius); padding: 48px 32px; box-shadow: var(--shadow); }
.error-code { font-size: 72px; font-weight: 900; color: var(--primary); line-height: 1; margin-bottom: 12px; letter-spacing: -0.04em; }
.error-card h1 { font-size: 24px; font-weight: 700; margin: 0 0 10px; }
.error-card p { color: var(--text-secondary); font-size: 15px; line-height: 1.6; margin: 0 0 28px; }
.error-actions { display: flex; justify-content: center; gap: 12px; flex-wrap: wrap; }

/* ============================================================
   Responsive Tweaks
   ============================================================ */
@media (max-width: 960px) {
    .about-stats-grid { grid-template-columns: repeat(2, 1fr); gap: 18px; }
    .about-grid-3 { grid-template-columns: repeat(2, 1fr); }
    .contact-layout { grid-template-columns: 1fr; }
    .mission-vision-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .about-hero h1 { font-size: 32px; }
    .contact-hero h1 { font-size: 30px; }
    .about-grid-3, .about-grid-2 { grid-template-columns: 1fr; }
    .form-row-2 { grid-template-columns: 1fr; }
    .cta-banner { padding: 32px 20px; }
    .cta-banner h2 { font-size: 26px; }
}