/* =============================================
   style.css — ToolKit Pro
   Professional Online Utility Hub
   ============================================= */

/* ── Google Fonts already loaded in HTML ── */

/* ══════════════════════════════════════════════
   1. CSS VARIABLES (Theme Tokens)
══════════════════════════════════════════════ */
:root {
  /* Fonts */
  --font-main: 'Outfit', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Radius */
  --r-sm:  8px;
  --r-md:  14px;
  --r-lg:  20px;
  --r-xl:  28px;
  --r-pill: 999px;

  /* Transition */
  --transition: 0.22s ease;
}

/* ── DARK THEME (default) ── */
[data-theme="dark"] {
  --bg:           #0c0e18;
  --bg2:          #111424;
  --surface:      #181c30;
  --surface2:     #1e2338;
  --border:       #2a2f4a;
  --border-light: #333859;

  --text:         #eef0f8;
  --text-muted:   #7a80a0;
  --text-faint:   #4a506a;

  --accent:       #6c63ff;
  --accent-glow:  rgba(108,99,255,0.25);
  --accent2:      #f59e0b;
  --accent3:      #10b981;
  --accent4:      #ef4444;

  --card-bg:      #161929;
  --card-border:  #242840;
  --nav-bg:       rgba(12,14,24,0.92);
  --shadow:       0 8px 40px rgba(0,0,0,0.5);
  --shadow-sm:    0 2px 12px rgba(0,0,0,0.3);
}

/* ── LIGHT THEME ── */
[data-theme="light"] {
  --bg:           #f4f5fb;
  --bg2:          #eceef8;
  --surface:      #ffffff;
  --surface2:     #f0f1fa;
  --border:       #d8daf0;
  --border-light: #e4e6f5;

  --text:         #1a1d35;
  --text-muted:   #5a6080;
  --text-faint:   #9aa0c0;

  --accent:       #5b52e8;
  --accent-glow:  rgba(91,82,232,0.15);
  --accent2:      #d97706;
  --accent3:      #059669;
  --accent4:      #dc2626;

  --card-bg:      #ffffff;
  --card-border:  #e0e2f0;
  --nav-bg:       rgba(244,245,251,0.94);
  --shadow:       0 8px 40px rgba(100,110,180,0.12);
  --shadow-sm:    0 2px 12px rgba(100,110,180,0.08);
}

/* ══════════════════════════════════════════════
   2. RESET & BASE
══════════════════════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-main);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
  overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }
button { font-family: var(--font-main); cursor: pointer; }
input, select { font-family: var(--font-main); }

/* ══════════════════════════════════════════════
   3. NAVIGATION
══════════════════════════════════════════════ */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 62px;
  display: flex;
  align-items: center;
  gap: 20px;
}

/* Logo */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 1.15rem;
  font-weight: 700;
  white-space: nowrap;
}
.logo-icon { font-size: 1.3rem; }
.logo-text strong { color: var(--accent); }

/* Nav links (desktop) */
.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
  margin-left: auto;
}
.nav-link {
  display: block;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
}
.nav-link:hover {
  color: var(--text);
  background: var(--surface2);
}

/* Right side */
.nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto; /* pushes to right on mobile */
}

/* Theme toggle */
.theme-toggle {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}
.theme-toggle:hover {
  background: var(--surface2);
  transform: scale(1.08);
}

/* Hamburger (mobile only) */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: var(--r-sm);
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

/* Mobile Drawer */
.mobile-drawer {
  position: fixed;
  top: 62px;
  right: -260px;
  width: 240px;
  height: calc(100vh - 62px);
  background: var(--surface);
  border-left: 1px solid var(--border);
  z-index: 99;
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: right 0.28s cubic-bezier(.4,0,.2,1);
}
.mobile-drawer.open { right: 0; }
.mobile-drawer a {
  padding: 12px 16px;
  border-radius: var(--r-md);
  font-weight: 500;
  color: var(--text-muted);
  transition: all var(--transition);
  font-size: 0.95rem;
}
.mobile-drawer a:hover {
  background: var(--surface2);
  color: var(--text);
}
.drawer-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 98;
  background: rgba(0,0,0,0.4);
}
.drawer-overlay.open { display: block; }

/* ══════════════════════════════════════════════
   4. MAIN CONTENT
══════════════════════════════════════════════ */
.main-content {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}

/* Pages: only one visible at a time */
.page { display: none; }
.page.active { display: block; animation: fadeUp 0.35s ease both; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ══════════════════════════════════════════════
   5. HOME PAGE
══════════════════════════════════════════════ */

/* Hero */
.hero {
  text-align: center;
  padding: 60px 20px 50px;
}
.hero-badge {
  display: inline-block;
  background: var(--accent-glow);
  color: var(--accent);
  border: 1px solid rgba(108,99,255,0.35);
  border-radius: var(--r-pill);
  padding: 6px 18px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(2.4rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -1.5px;
  margin-bottom: 18px;
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent), #a78bfa, #f59e0b);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-sub {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
  font-weight: 400;
}

/* Tool Cards Grid */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  margin-bottom: 48px;
}

.tool-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-xl);
  padding: 26px 22px;
  display: flex;
  align-items: center;
  gap: 16px;
  cursor: pointer;
  transition: all 0.25s ease;
  position: relative;
  overflow: hidden;
}
.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--c1, transparent) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.25s;
}
.tool-card:hover {
  border-color: var(--border-light);
  transform: translateY(-3px);
  box-shadow: var(--shadow);
}
.tool-card:hover::before { opacity: 0.05; }

.card-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: linear-gradient(135deg, var(--c1), var(--c2));
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 1.5rem;
  box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}

.card-body { flex: 1; }
.card-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 4px;
}
.card-body p {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.card-arrow {
  font-size: 1.2rem;
  color: var(--text-faint);
  transition: all var(--transition);
}
.tool-card:hover .card-arrow {
  color: var(--accent);
  transform: translateX(4px);
}

/* Stats Strip */
.stats-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 20px 30px;
  flex-wrap: wrap;
  gap: 20px;
}
.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}
.stat-num {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--accent);
  font-family: var(--font-mono);
}
.stat-lbl {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}
.stat-div {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* ══════════════════════════════════════════════
   6. TOOLS PAGE
══════════════════════════════════════════════ */

/* Tool header: back + tab strip */
.tool-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}

.back-btn {
  padding: 9px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
}
.back-btn:hover {
  color: var(--text);
  background: var(--surface2);
}

/* Tool tabs (the strip of 4 tools) */
.tool-tabs {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.ttab {
  padding: 9px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.88rem;
  font-weight: 600;
  transition: all var(--transition);
  white-space: nowrap;
}
.ttab.active, .ttab:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 16px var(--accent-glow);
}

/* Tool panels */
.tool-panel { display: none; }
.tool-panel.active { display: block; animation: fadeUp 0.3s ease both; }

/* Inner card */
.tool-card-inner {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--r-xl);
  padding: 32px 28px;
  box-shadow: var(--shadow-sm);
}

/* Tool title row */
.tool-title {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.tool-emoji {
  font-size: 2.2rem;
  width: 56px;
  height: 56px;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.tool-title h2 {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 2px;
}
.tool-title p {
  font-size: 0.83rem;
  color: var(--text-muted);
}

/* Category tabs (Length/Weight/Temp) */
.cat-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.ctab {
  padding: 8px 18px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text-muted);
  font-size: 0.86rem;
  font-weight: 600;
  transition: all var(--transition);
}
.ctab.active {
  background: var(--surface2);
  color: var(--text);
  border-color: var(--border-light);
}
.ctab:hover:not(.active) {
  background: var(--surface);
  color: var(--text);
}

/* Unit category panels */
.unit-cat { display: none; }
.unit-cat.active { display: block; animation: fadeUp 0.25s ease both; }

/* ══════════════════════════════════════════════
   7. CONVERTER ROW (shared layout)
══════════════════════════════════════════════ */
.converter-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 12px;
  align-items: end;
  margin-bottom: 16px;
}

.field-group {
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.field-group label {
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.input-combo {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

/* Number input */
input[type="number"],
input[type="date"] {
  width: 100%;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 1.05rem;
  padding: 13px 14px;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
  -moz-appearance: textfield;
}
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button { -webkit-appearance: none; }
input[type="number"]:focus,
input[type="date"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
input[readonly] {
  background: var(--surface2);
  color: var(--accent);
  font-weight: 500;
  cursor: default;
}

/* Select */
select {
  width: 100%;
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text);
  font-family: var(--font-main);
  font-size: 0.9rem;
  font-weight: 600;
  padding: 11px 14px;
  outline: none;
  cursor: pointer;
  transition: border-color var(--transition);
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' fill='none'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237a80a0' stroke-width='1.8' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
}
select:focus { border-color: var(--accent); }

/* Swap button */
.swap-btn {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  align-self: center;
  margin-top: 14px;
  transition: all var(--transition);
  flex-shrink: 0;
}
.swap-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  transform: rotate(180deg);
}

/* Result chip */
.result-chip {
  min-height: 20px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent);
  margin-top: 4px;
  padding: 2px 0;
  font-family: var(--font-mono);
  opacity: 0;
  transition: opacity var(--transition);
}
.result-chip.visible { opacity: 1; }

/* ══════════════════════════════════════════════
   8. CURRENCY TOOL
══════════════════════════════════════════════ */
.rate-note {
  font-size: 0.78rem;
  color: var(--text-faint);
  margin-top: 8px;
  padding: 10px 14px;
  background: var(--surface);
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
}

.rate-table-wrap {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.rate-table-wrap h4 {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}
.rate-table {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
  gap: 8px;
}
.rate-pill {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  padding: 8px 12px;
  font-size: 0.82rem;
}
.rate-pill .rp-cur {
  font-weight: 700;
  color: var(--text);
  display: block;
}
.rate-pill .rp-val {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.8rem;
}

/* ══════════════════════════════════════════════
   9. BMI TOOL
══════════════════════════════════════════════ */
.bmi-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 22px;
}

.bmi-result-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 22px;
  text-align: center;
  margin-bottom: 20px;
  transition: all var(--transition);
}
.bmi-score {
  font-size: 3rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text);
  line-height: 1;
  margin-bottom: 6px;
}
.bmi-category {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-muted);
}

/* Color states for BMI */
.bmi-result-box.underweight { border-color: #3b82f6; box-shadow: 0 0 0 3px rgba(59,130,246,0.15); }
.bmi-result-box.normal      { border-color: #10b981; box-shadow: 0 0 0 3px rgba(16,185,129,0.15); }
.bmi-result-box.overweight  { border-color: #f59e0b; box-shadow: 0 0 0 3px rgba(245,158,11,0.15); }
.bmi-result-box.obese       { border-color: #ef4444; box-shadow: 0 0 0 3px rgba(239,68,68,0.15); }

.bmi-result-box.underweight .bmi-score,
.bmi-result-box.underweight .bmi-category { color: #3b82f6; }
.bmi-result-box.normal .bmi-score,
.bmi-result-box.normal .bmi-category      { color: #10b981; }
.bmi-result-box.overweight .bmi-score,
.bmi-result-box.overweight .bmi-category  { color: #f59e0b; }
.bmi-result-box.obese .bmi-score,
.bmi-result-box.obese .bmi-category       { color: #ef4444; }

/* BMI Scale */
.bmi-scale {
  position: relative;
  margin-bottom: 16px;
}
.scale-bar {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr 1fr;
  border-radius: var(--r-sm);
  overflow: hidden;
  height: 48px;
}
.scale-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.65rem;
  font-weight: 700;
  color: rgba(255,255,255,0.9);
  text-align: center;
  line-height: 1.2;
  padding: 4px;
}
.scale-seg.underweight { background: #3b82f6; }
.scale-seg.normal      { background: #10b981; }
.scale-seg.overweight  { background: #f59e0b; }
.scale-seg.obese       { background: #ef4444; }

.scale-needle {
  position: absolute;
  top: -6px;
  width: 3px;
  height: 60px;
  background: var(--text);
  border-radius: 3px;
  transform: translateX(-50%);
  transition: left 0.5s cubic-bezier(.4,0,.2,1), opacity 0.3s;
  box-shadow: 0 0 6px rgba(0,0,0,0.5);
}
.scale-needle::after {
  content: '';
  position: absolute;
  top: -4px;
  left: 50%;
  transform: translateX(-50%);
  width: 10px;
  height: 10px;
  background: var(--text);
  border-radius: 50%;
}

.bmi-tip {
  font-size: 0.84rem;
  color: var(--text-muted);
  padding: 10px 14px;
  background: var(--surface);
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
  min-height: 20px;
  transition: all var(--transition);
}

/* ══════════════════════════════════════════════
   10. AGE TOOL
══════════════════════════════════════════════ */
.age-result-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 26px 20px;
  margin: 20px 0;
  transition: all var(--transition);
}
.age-result-box.has-result {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.age-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  text-align: center;
}
.age-unit { display: flex; flex-direction: column; gap: 4px; }
.age-num {
  font-size: 2.4rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--accent);
  line-height: 1;
}
.age-lbl {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.age-extras { display: flex; flex-direction: column; gap: 8px; }
.age-extra-row {
  font-size: 0.87rem;
  color: var(--text-muted);
  padding: 10px 14px;
  background: var(--surface);
  border-radius: var(--r-sm);
  border: 1px solid var(--border);
}
.age-extra-row strong { color: var(--text); }

/* ══════════════════════════════════════════════
   11. FOOTER
══════════════════════════════════════════════ */
.site-footer {
  text-align: center;
  padding: 24px 20px;
  border-top: 1px solid var(--border);
  color: var(--text-faint);
  font-size: 0.82rem;
}
.site-footer strong { color: var(--accent); }

/* ══════════════════════════════════════════════
   12. RESPONSIVE — MOBILE
══════════════════════════════════════════════ */
@media (max-width: 700px) {

  /* Hide desktop nav links; show hamburger */
  .nav-links { display: none; }
  .hamburger { display: flex; }
  .nav-right  { margin-left: auto; }

  /* Hero */
  .hero { padding: 40px 8px 32px; }
  .hero-title { font-size: 2rem; }

  /* Cards */
  .cards-grid { grid-template-columns: 1fr; gap: 12px; }

  /* Stats strip */
  .stats-strip { gap: 14px; padding: 16px 20px; }
  .stat-div { display: none; }

  /* Converter row: stack on mobile */
  .converter-row {
    grid-template-columns: 1fr;
    gap: 10px;
  }
  .swap-btn { margin: 0 auto; }

  /* BMI inputs: stack */
  .bmi-inputs { grid-template-columns: 1fr; }

  /* Age grid */
  .age-num { font-size: 1.8rem; }

  /* Tool card inner */
  .tool-card-inner { padding: 22px 16px; }

  /* Tool tabs: scrollable */
  .tool-tabs { overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
  .ttab { white-space: nowrap; }

  /* Tool header */
  .tool-header { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 400px) {
  .scale-seg { font-size: 0.55rem; }
  .age-num   { font-size: 1.5rem; }
}