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

:root {
  --color-primary: #1a4a8a;
  --color-secondary: #0d6efd;
  --color-accent: #f0a500;
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #1a1a2e;
  --color-text-muted: #6b7280;
  --color-border: #dde1ea;
  --radius: 6px;
  --shadow: 0 2px 8px rgba(0,0,0,.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,.12);
  --font-main: 'Inter', sans-serif;
  --max-w: 1200px;
  --header-h: 64px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font-main); background: var(--color-bg); color: var(--color-text); line-height: 1.6; font-size: 16px; }
a { color: var(--color-secondary); text-decoration: none; }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--color-secondary); outline-offset: 2px; border-radius: 2px; }
img { max-width: 100%; height: auto; }

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

/* HEADER */
.site-header { background: var(--color-primary); height: var(--header-h); position: sticky; top: 0; z-index: 100; box-shadow: 0 2px 8px rgba(0,0,0,.2); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; gap: 16px; }
.site-logo { display: flex; align-items: center; gap: 10px; color: #fff; font-weight: 700; font-size: 1.15rem; white-space: nowrap; text-decoration: none; }
.site-logo:hover { text-decoration: none; color: #fff; }
.logo-icon { width: 34px; height: 34px; background: var(--color-accent); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-weight: 700; color: var(--color-primary); font-size: .95rem; }
.site-nav { display: flex; align-items: center; gap: 2px; }
.site-nav a { color: rgba(255,255,255,.85); padding: 6px 11px; border-radius: var(--radius); font-size: .875rem; font-weight: 500; transition: background .15s, color .15s; text-decoration: none; }
.site-nav a:hover, .site-nav a.active { background: rgba(255,255,255,.15); color: #fff; }
.header-search { position: relative; flex: 1; max-width: 320px; }
.header-search input { width: 100%; padding: 8px 12px 8px 34px; border: none; border-radius: var(--radius); background: rgba(255,255,255,.15); color: #fff; font-size: .875rem; font-family: var(--font-main); }
.header-search input::placeholder { color: rgba(255,255,255,.55); }
.header-search input:focus { outline: none; background: rgba(255,255,255,.22); }
.search-icon { position: absolute; left: 10px; top: 50%; transform: translateY(-50%); color: rgba(255,255,255,.65); pointer-events: none; }
.search-results { position: absolute; top: calc(100% + 6px); left: 0; right: 0; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); box-shadow: var(--shadow-md); max-height: 340px; overflow-y: auto; display: none; z-index: 200; }
.search-results.open { display: block; }
.search-result-item { display: flex; align-items: center; gap: 10px; padding: 9px 14px; cursor: pointer; transition: background .1s; color: var(--color-text); text-decoration: none; }
.search-result-item:hover, .search-result-item.focused { background: var(--color-bg); }
.result-cat { font-size: .72rem; color: var(--color-text-muted); background: var(--color-bg); padding: 2px 6px; border-radius: 20px; white-space: nowrap; }
.search-no-results { padding: 14px; text-align: center; color: var(--color-text-muted); font-size: .875rem; }
.menu-toggle { display: none; background: none; border: none; color: #fff; cursor: pointer; padding: 8px; font-size: 1.3rem; line-height: 1; }

/* HERO */
.hero { background: linear-gradient(135deg, var(--color-primary) 0%, #0d3d6e 55%, #0d6efd 100%); color: #fff; padding: 60px 0 52px; text-align: center; }
.hero h1 { font-size: clamp(1.75rem, 4vw, 2.75rem); font-weight: 700; line-height: 1.2; margin-bottom: 16px; }
.hero h1 span { color: var(--color-accent); }
.hero p { font-size: 1.05rem; opacity: .9; max-width: 660px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-bottom: 44px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 22px; border-radius: var(--radius); font-size: .925rem; font-weight: 600; cursor: pointer; border: none; transition: opacity .15s, transform .1s; font-family: var(--font-main); text-decoration: none; }
.btn:hover { opacity: .9; transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: none; }
.btn-primary { background: var(--color-accent); color: var(--color-primary); }
.btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,.45); }
.btn-outline:hover { border-color: #fff; color: #fff; }
.btn-secondary { background: var(--color-secondary); color: #fff; }
.btn-sm { padding: 7px 14px; font-size: .82rem; }
.btn-danger { background: #dc3545; color: #fff; }
.stats-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 14px; max-width: 680px; margin: 0 auto; }
.stat-card { background: rgba(255,255,255,.12); border-radius: var(--radius); padding: 14px 10px; text-align: center; }
.stat-value { font-size: 1.45rem; font-weight: 700; color: var(--color-accent); }
.stat-label { font-size: .78rem; opacity: .8; margin-top: 3px; }

/* QUICK SEARCH */
.quick-search { background: var(--color-surface); padding: 30px 0; border-bottom: 1px solid var(--color-border); }
.quick-search-inner { max-width: 700px; margin: 0 auto; text-align: center; }
.quick-search h2 { font-size: 1.25rem; margin-bottom: 12px; }
.quick-search-box { position: relative; }
.quick-search-box input { width: 100%; padding: 13px 18px 13px 46px; border: 2px solid var(--color-border); border-radius: 40px; font-size: .975rem; font-family: var(--font-main); transition: border-color .15s; background: var(--color-bg); }
.quick-search-box input:focus { outline: none; border-color: var(--color-secondary); }
.quick-search-box .search-icon { left: 16px; color: var(--color-text-muted); font-size: 1rem; }
.filters { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 12px; justify-content: center; }
.filter-btn { padding: 5px 13px; border-radius: 20px; border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text-muted); font-size: .82rem; cursor: pointer; font-family: var(--font-main); transition: all .15s; }
.filter-btn.active, .filter-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* SECTION */
.section { padding: 44px 0; }
.section-header { display: flex; align-items: baseline; justify-content: space-between; margin-bottom: 22px; }
.section-title { font-size: 1.35rem; font-weight: 700; }
.view-all { font-size: .875rem; }
.categories-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px,1fr)); gap: 14px; }
.category-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 18px; text-decoration: none; color: var(--color-text); transition: box-shadow .15s, border-color .15s, transform .15s; display: block; }
.category-card:hover { box-shadow: var(--shadow-md); border-color: var(--color-secondary); transform: translateY(-2px); text-decoration: none; color: var(--color-text); }
.cat-icon { font-size: 1.7rem; margin-bottom: 8px; }
.cat-name { font-weight: 600; font-size: .925rem; margin-bottom: 3px; }
.cat-count { font-size: .78rem; color: var(--color-text-muted); }
.converters-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(230px,1fr)); gap: 10px; }
.converter-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 12px 15px; text-decoration: none; color: var(--color-text); font-size: .875rem; display: flex; align-items: center; justify-content: space-between; transition: all .15s; }
.converter-card:hover { border-color: var(--color-secondary); box-shadow: var(--shadow); color: var(--color-secondary); text-decoration: none; }
.converter-card-badge { font-size: .72rem; color: var(--color-text-muted); background: var(--color-bg); padding: 2px 7px; border-radius: 20px; white-space: nowrap; }

/* CONVERTER PAGE */
.page-layout { display: grid; grid-template-columns: 1fr 290px; gap: 22px; padding: 28px 0 44px; }
.breadcrumb { display: flex; align-items: center; gap: 5px; font-size: .82rem; color: var(--color-text-muted); margin-bottom: 18px; flex-wrap: wrap; }
.breadcrumb a { color: var(--color-text-muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--color-secondary); }
.bc-sep { color: var(--color-border); }
.tool-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); margin-bottom: 22px; }
.tool-card h1 { font-size: 1.45rem; margin-bottom: 5px; }
.tool-desc { color: var(--color-text-muted); font-size: .9rem; margin-bottom: 22px; }
.converter-grid { display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; align-items: end; margin-bottom: 16px; }
.input-group { display: flex; flex-direction: column; gap: 5px; }
.input-group label { font-size: .82rem; font-weight: 500; color: var(--color-text-muted); }
.input-group input, .input-group select { padding: 11px 13px; border: 2px solid var(--color-border); border-radius: var(--radius); font-size: .975rem; font-family: var(--font-main); width: 100%; transition: border-color .15s; background: var(--color-surface); color: var(--color-text); }
.input-group input:focus, .input-group select:focus { outline: none; border-color: var(--color-secondary); }
.input-group input.error { border-color: #dc3545; }
.error-msg { font-size: .78rem; color: #dc3545; margin-top: 3px; min-height: 16px; }
.swap-btn { background: var(--color-bg); border: 1px solid var(--color-border); border-radius: 50%; width: 38px; height: 38px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-size: 1rem; transition: all .15s; align-self: flex-end; margin-bottom: 2px; }
.swap-btn:hover { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.result-display { background: var(--color-bg); border: 2px solid var(--color-border); border-radius: var(--radius); padding: 14px 18px; margin: 14px 0; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.result-value { font-size: 1.35rem; font-weight: 700; color: var(--color-primary); word-break: break-all; }
.result-unit { color: var(--color-text-muted); font-size: .875rem; white-space: nowrap; }
.tool-actions { display: flex; gap: 7px; flex-wrap: wrap; }
.info-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 22px; margin-bottom: 18px; }
.info-card h2 { font-size: 1.05rem; margin-bottom: 11px; padding-bottom: 9px; border-bottom: 1px solid var(--color-border); font-weight: 600; }
.info-card h3 { font-size: .95rem; margin: 14px 0 7px; font-weight: 600; }
.info-card p { font-size: .875rem; color: var(--color-text-muted); margin-bottom: 9px; }
.info-card ul { padding-left: 17px; }
.info-card ul li { font-size: .875rem; color: var(--color-text-muted); margin-bottom: 5px; }
.formula-box { background: #eef3ff; border-left: 4px solid var(--color-secondary); padding: 12px 16px; border-radius: 0 var(--radius) var(--radius) 0; font-family: monospace; font-size: .9rem; margin: 10px 0; color: var(--color-primary); }
.faq-item { border-bottom: 1px solid var(--color-border); padding: 13px 0; }
.faq-item:last-child { border-bottom: none; }
.faq-q { font-weight: 600; font-size: .9rem; cursor: pointer; display: flex; justify-content: space-between; align-items: center; user-select: none; }
.faq-toggle { font-size: 1.1rem; color: var(--color-text-muted); }
.faq-a { font-size: .875rem; color: var(--color-text-muted); margin-top: 7px; display: none; line-height: 1.65; }
.faq-a.open { display: block; }
.related-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.related-link { padding: 9px 11px; border: 1px solid var(--color-border); border-radius: var(--radius); font-size: .82rem; color: var(--color-text); text-decoration: none; transition: all .15s; display: block; }
.related-link:hover { border-color: var(--color-secondary); color: var(--color-secondary); text-decoration: none; }
.sidebar-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 16px; margin-bottom: 14px; }
.sidebar-card h3 { font-size: .9rem; font-weight: 600; margin-bottom: 11px; }
.sidebar-links { display: flex; flex-direction: column; gap: 5px; }
.sidebar-links a { font-size: .82rem; color: var(--color-text-muted); padding: 5px 0; border-bottom: 1px solid var(--color-bg); text-decoration: none; }
.sidebar-links a:hover { color: var(--color-secondary); }

/* UNIVERSAL */
.univ-wrapper { max-width: 820px; margin: 0 auto; padding: 28px 0 48px; }
.univ-tool { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); }
.select-row { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; margin-bottom: 18px; }
.history-list { list-style: none; max-height: 260px; overflow-y: auto; }
.history-item { display: flex; justify-content: space-between; align-items: center; padding: 8px 11px; border-radius: var(--radius); font-size: .82rem; border: 1px solid var(--color-border); margin-bottom: 5px; cursor: pointer; transition: all .15s; }
.history-item:hover { background: var(--color-bg); border-color: var(--color-secondary); }
.fav-star { cursor: pointer; background: none; border: none; padding: 3px; font-size: .9rem; color: var(--color-text-muted); }
.fav-star.active { color: var(--color-accent); }
.tab-bar { display: flex; border-bottom: 2px solid var(--color-border); margin-bottom: 18px; gap: 0; }
.tab-btn { padding: 9px 16px; font-size: .875rem; font-weight: 500; background: none; border: none; cursor: pointer; color: var(--color-text-muted); border-bottom: 2px solid transparent; margin-bottom: -2px; font-family: var(--font-main); transition: all .15s; }
.tab-btn.active { color: var(--color-secondary); border-bottom-color: var(--color-secondary); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* FOOTER */
.site-footer { background: var(--color-primary); color: rgba(255,255,255,.8); padding: 44px 0 22px; margin-top: 44px; }
.footer-grid { display: grid; grid-template-columns: 2fr repeat(3,1fr); gap: 28px; margin-bottom: 28px; }
.footer-brand p { font-size: .875rem; opacity: .7; margin-top: 10px; line-height: 1.7; }
.footer-col h4 { color: #fff; font-size: .875rem; font-weight: 600; margin-bottom: 13px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 7px; }
.footer-col ul li a { color: rgba(255,255,255,.68); font-size: .82rem; text-decoration: none; }
.footer-col ul li a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.14); padding-top: 18px; display: flex; align-items: center; justify-content: space-between; font-size: .78rem; flex-wrap: wrap; gap: 7px; }
.footer-bottom a { color: rgba(255,255,255,.58); text-decoration: none; }
.footer-bottom a:hover { color: #fff; }
.footer-links { display: flex; gap: 16px; flex-wrap: wrap; }

/* STATIC PAGES */
.page-hero { background: linear-gradient(135deg, var(--color-primary) 0%, #0d3d6e 100%); color: #fff; padding: 44px 0 38px; text-align: center; }
.page-hero h1 { font-size: 1.9rem; font-weight: 700; margin-bottom: 7px; }
.page-hero p { opacity: .83; font-size: .95rem; }
.page-content { max-width: 780px; margin: 0 auto; padding: 36px 20px 48px; }
.page-content h2 { font-size: 1.2rem; font-weight: 700; margin: 26px 0 9px; color: var(--color-primary); }
.page-content h3 { font-size: .975rem; font-weight: 600; margin: 18px 0 7px; }
.page-content p, .page-content li { font-size: .925rem; color: var(--color-text-muted); margin-bottom: 9px; line-height: 1.7; }
.page-content ul, .page-content ol { padding-left: 20px; margin-bottom: 10px; }
.form-group { margin-bottom: 15px; }
.form-group label { display: block; font-weight: 500; font-size: .875rem; margin-bottom: 5px; }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 10px 13px; border: 2px solid var(--color-border); border-radius: var(--radius); font-size: .925rem; font-family: var(--font-main); transition: border-color .15s; background: var(--color-surface); color: var(--color-text); }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--color-secondary); }
.form-group textarea { resize: vertical; min-height: 110px; }
.success-msg { background: #d1fae5; color: #065f46; padding: 12px 16px; border-radius: var(--radius); font-size: .9rem; display: none; }
.success-msg.show { display: block; }

/* TOAST */
.toast { position: fixed; bottom: 20px; right: 20px; background: var(--color-primary); color: #fff; padding: 11px 18px; border-radius: var(--radius); font-size: .875rem; box-shadow: var(--shadow-md); opacity: 0; transform: translateY(8px); transition: all .2s; pointer-events: none; z-index: 9999; }
.toast.show { opacity: 1; transform: translateY(0); }

/* MISC */
.tag { display: inline-block; padding: 2px 9px; background: rgba(13,110,253,.1); color: var(--color-secondary); border-radius: 20px; font-size: .75rem; font-weight: 500; }
.divider { height: 1px; background: var(--color-border); margin: 20px 0; }
.text-muted { color: var(--color-text-muted); }
.mt-1 { margin-top: 8px; } .mt-2 { margin-top: 16px; } .mt-3 { margin-top: 24px; }
.mb-1 { margin-bottom: 8px; } .mb-2 { margin-bottom: 16px; }
.alert { padding: 12px 16px; border-radius: var(--radius); font-size: .875rem; margin-bottom: 14px; }
.alert-info { background: #eff6ff; color: #1d4ed8; border: 1px solid #bfdbfe; }
.alert-warning { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }

/* CURRENCY LOADER */
.rate-badge { font-size: .75rem; color: var(--color-text-muted); margin-top: 5px; }
.loading-spinner { display: inline-block; width: 14px; height: 14px; border: 2px solid var(--color-border); border-top-color: var(--color-secondary); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* RESPONSIVE */
@media (max-width: 900px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .page-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
}
@media (max-width: 700px) {
  .site-nav { display: none; }
  .site-nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: var(--color-primary); padding: 10px 16px; gap: 3px; box-shadow: var(--shadow-md); }
  .menu-toggle { display: flex; }
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .converter-grid { grid-template-columns: 1fr; }
  .swap-btn { align-self: center; }
  .select-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .header-search { display: none; }
  .categories-grid { grid-template-columns: repeat(2,1fr); }
  .related-grid { grid-template-columns: 1fr; }
  .hero { padding: 38px 0 32px; }
}
@media (max-width: 480px) {
  .hero h1 { font-size: 1.55rem; }
  .hero p { font-size: .9rem; }
  .categories-grid { grid-template-columns: 1fr 1fr; }
}