/* ══════════════════════════════════════
   ROOT & RESET
══════════════════════════════════════ */
:root {
  --bg:        #0f0f1a;
  --bg2:       #1a1a2e;
  --bg3:       #16213e;
  --surface:   #1e1e35;
  --surface2:  #252545;
  --border:    #2d2d52;
  --accent:    #6c63ff;
  --accent2:   #a78bfa;
  --accent-glow: rgba(108,99,255,.35);
  --text:      #e8e8f0;
  --text2:     #9999bb;
  --text3:     #5555aa;
  --success:   #4ade80;
  --warning:   #facc15;
  --danger:    #f87171;
  --radius:    12px;
  --radius-sm: 8px;
  --shadow:    0 4px 24px rgba(0,0,0,.45);
  --font:      'Inter', system-ui, sans-serif;
  --trans:     .2s ease;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
}

/* Prevent sticky header from covering anchored sections. */
.tool-card[id] { scroll-margin-top: 5rem; }

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

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

canvas,
svg {
  max-width: 100%;
}

a {
  color: #CFD8DC;
  text-decoration: none;
  transition: color var(--trans);
}

a:hover {
  color: #e8f0f5;
}

/* ══════════════════════════════════════
   HEADER
══════════════════════════════════════ */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15,15,26,.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: .9rem 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: .55rem;
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -.02em;
}

.logo-icon { font-size: 1.4rem; }

nav {
  display: flex;
  flex-wrap: wrap;
  gap: .25rem;
}

nav a {
  color: var(--text2);
  text-decoration: none;
  font-size: .8rem;
  font-weight: 500;
  padding: .35rem .65rem;
  border-radius: var(--radius-sm);
  transition: background var(--trans), color var(--trans);
}

nav a:hover {
  background: var(--surface);
  color: var(--accent2);
}

/* ══════════════════════════════════════
   HERO
══════════════════════════════════════ */
.hero {
  padding: 4rem 0 2.5rem;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, rgba(108,99,255,.2) 0%, transparent 70%);
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -.03em;
  background: linear-gradient(135deg, #fff 30%, var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  color: var(--text2);
  margin-top: .6rem;
  font-size: 1.05rem;
}

/* ══════════════════════════════════════
   TOOL CARDS
══════════════════════════════════════ */
main {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding-top: 1rem;
  padding-bottom: 4rem;
}

.tool-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  box-shadow: var(--shadow);
  transition: border-color var(--trans);
}

.tool-card:hover { border-color: var(--accent); }

.tool-header {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.tool-icon { font-size: 2rem; line-height: 1; flex-shrink: 0; }

.tool-header h2 {
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -.02em;
}

.tool-desc { color: var(--text2); font-size: .9rem; margin-top: .2rem; }

/* ══════════════════════════════════════
   BUTTONS
══════════════════════════════════════ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .65rem 1.4rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--trans);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: #7d75ff;
  box-shadow: 0 0 20px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent2);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text2);
  padding: .45rem .85rem;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--trans);
}
.btn-outline:hover,
.btn-outline.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.btn-icon {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: .65rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  transition: all var(--trans);
  flex-shrink: 0;
}
.btn-icon:hover { border-color: var(--accent); color: var(--accent2); }

.btn-spin {
  background: linear-gradient(135deg, var(--accent), #c084fc);
  color: #fff;
  border: none;
  border-radius: 50px;
  padding: .8rem 2.5rem;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  letter-spacing: .08em;
  transition: all var(--trans);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-spin:hover { transform: scale(1.05); box-shadow: 0 6px 28px var(--accent-glow); }
.btn-spin:active { transform: scale(.97); }
.btn-spin:disabled { opacity: .5; cursor: not-allowed; transform: none; }

/* ══════════════════════════════════════
   FORM ELEMENTS
══════════════════════════════════════ */
.input-field {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .65rem .9rem;
  border-radius: var(--radius-sm);
  font-size: .9rem;
  font-family: var(--font);
  transition: border-color var(--trans);
}
.input-field:focus { outline: none; border-color: var(--accent); }
.input-field.compact { max-width: 100px; }

.select-field {
  width: 100%;
  background: var(--bg2);
  border: 1px solid var(--border);
  color: var(--text);
  padding: .6rem .9rem;
  border-radius: var(--radius-sm);
  font-size: .85rem;
  font-family: var(--font);
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239999bb' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right .75rem center;
  padding-right: 2rem;
}
.select-field:focus { outline: none; border-color: var(--accent); }

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.form-label {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  font-size: .85rem;
  font-weight: 500;
  color: var(--text2);
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: .5rem;
}
.checkbox-group label {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .88rem;
  color: var(--text2);
  cursor: pointer;
}
.checkbox-group.horiz { flex-direction: row; flex-wrap: wrap; }

input[type="checkbox"],
input[type="radio"] {
  accent-color: var(--accent);
  width: 15px;
  height: 15px;
  cursor: pointer;
}

.tab {
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
  padding: .45rem 1rem;
  border-radius: var(--radius-sm);
  font-size: .83rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--trans);
}
.tab:hover { border-color: var(--accent); color: var(--accent2); }
.tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.hidden { display: none !important; }

/* ══════════════════════════════════════
   AFFILIATE BOX
══════════════════════════════════════ */
.affiliate-box {
  margin-top: 1.25rem;
  padding: .9rem 1.1rem;
  background: rgba(108,99,255,.1);
  border: 1px solid rgba(108,99,255,.3);
  border-radius: var(--radius-sm);
  font-size: .85rem;
  color: var(--text2);
  line-height: 1.5;
}
.affiliate-box a {
  color: #CFD8DC;
  text-decoration: underline;
  text-underline-offset: 2px;
}
.affiliate-box a:hover { color: #e8f0f5; }

/* ══════════════════════════════════════
   PASSWORD TOOL
══════════════════════════════════════ */
.pw-output-wrap {
  display: flex;
  gap: .6rem;
  margin-bottom: .75rem;
}

.pw-output {
  flex: 1;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 1rem;
  letter-spacing: .05em;
  background: var(--bg3);
  border: 1px solid var(--border);
  color: var(--accent2);
  padding: .7rem 1rem;
  border-radius: var(--radius-sm);
}

.strength-wrap {
  display: flex;
  align-items: center;
  gap: .8rem;
  margin-bottom: 1.1rem;
}

.strength-bar {
  flex: 1;
  height: 6px;
  background: var(--surface2);
  border-radius: 99px;
  overflow: hidden;
}

.strength-fill {
  height: 100%;
  width: 0;
  border-radius: 99px;
  transition: width .4s ease, background .4s ease;
}

.strength-label {
  font-size: .78rem;
  font-weight: 600;
  min-width: 60px;
  text-align: right;
  text-transform: uppercase;
  letter-spacing: .06em;
}

.pw-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin-bottom: 1.25rem;
}

.range-label {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  font-size: .85rem;
  color: var(--text2);
  min-width: 200px;
}
.range-label input[type="range"] {
  accent-color: var(--accent);
  width: 100%;
  cursor: pointer;
}
.range-label strong { color: var(--accent2); }

/* ══════════════════════════════════════
   UNIT CONVERTER
══════════════════════════════════════ */
.conv-type-tabs {
  display: flex;
  gap: .4rem;
  flex-wrap: wrap;
  margin-bottom: 1.25rem;
}

.conv-row {
  display: flex;
  align-items: flex-end;
  gap: 1rem;
  flex-wrap: wrap;
}

.conv-side {
  flex: 1;
  min-width: 140px;
  display: flex;
  flex-direction: column;
  gap: .5rem;
}

.conv-arrow {
  font-size: 1.4rem;
  color: var(--accent2);
  padding-bottom: .4rem;
  flex-shrink: 0;
}

/* ══════════════════════════════════════
   COLOR PALETTE
══════════════════════════════════════ */
.color-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.color-picker-label {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  font-size: .85rem;
  color: var(--text2);
  font-weight: 500;
}

.color-picker-label input[type="color"] {
  width: 52px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg2);
  cursor: pointer;
  padding: 2px;
}

.palette-swatches {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
}

.swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: .4rem;
  cursor: pointer;
}

.swatch-color {
  width: 68px;
  height: 68px;
  border-radius: var(--radius-sm);
  border: 2px solid transparent;
  transition: transform var(--trans), border-color var(--trans);
}
.swatch:hover .swatch-color {
  transform: scale(1.08);
  border-color: rgba(255,255,255,.4);
}

.swatch-hex {
  font-size: .72rem;
  color: var(--text2);
  font-family: monospace;
}

.swatch-copied {
  font-size: .65rem;
  color: var(--success);
  height: .8rem;
}

/* ══════════════════════════════════════
   TIP CALCULATOR
══════════════════════════════════════ */
.tip-pct-row {
  display: flex;
  align-items: center;
  gap: .4rem;
  flex-wrap: wrap;
}

.tip-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.tip-result-box {
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: .3rem;
}

.tip-result-label {
  font-size: .75rem;
  color: var(--text2);
  text-transform: uppercase;
  letter-spacing: .06em;
}

.tip-result-val {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--accent2);
}

/* ══════════════════════════════════════
   BMI CALCULATOR
══════════════════════════════════════ */
.bmi-unit-toggle {
  display: flex;
  gap: .5rem;
  margin-bottom: 1.25rem;
  flex-wrap: wrap;
}

.bmi-result {
  margin-top: 1.25rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.bmi-gauge-wrap {
  position: relative;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
}

.bmi-value-display {
  position: absolute;
  bottom: 12px;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
}

.bmi-category {
  font-size: 1.1rem;
  font-weight: 600;
  padding: .5rem 1.5rem;
  border-radius: 50px;
}

.bmi-scale {
  display: flex;
  gap: .5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.bmi-range {
  font-size: .72rem;
  padding: .3rem .7rem;
  border-radius: 50px;
  font-weight: 600;
}
.bmi-range.underweight { background: rgba(96,165,250,.2); color: #60a5fa; }
.bmi-range.normal      { background: rgba(74,222,128,.2); color: #4ade80; }
.bmi-range.overweight  { background: rgba(250,204,21,.2); color: #facc15; }
.bmi-range.obese       { background: rgba(248,113,113,.2); color: #f87171; }

/* ══════════════════════════════════════
   QR CODE
══════════════════════════════════════ */
.qr-controls {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.qr-options {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: flex-end;
}

.qr-options .form-label {
  min-width: 90px;
}

.qr-options input[type="color"] {
  width: 52px;
  height: 38px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg2);
  cursor: pointer;
  padding: 2px;
}

.qr-output {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

#qr-canvas-wrap canvas {
  border-radius: var(--radius-sm);
  border: 2px solid var(--border);
}

/* ══════════════════════════════════════
   DECISION WHEEL
══════════════════════════════════════ */
.wheel-layout {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  align-items: flex-start;
}

.wheel-options-panel {
  flex: 1;
  min-width: 220px;
  display: flex;
  flex-direction: column;
  gap: .75rem;
}

.wheel-items-list {
  display: flex;
  flex-direction: column;
  gap: .4rem;
  max-height: 240px;
  overflow-y: auto;
}

.wheel-item {
  display: flex;
  align-items: center;
  gap: .6rem;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .45rem .75rem;
  font-size: .87rem;
}

.wheel-item-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

.wheel-item-label { flex: 1; }

.wheel-item-del {
  background: none;
  border: none;
  color: var(--text3);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
  padding: 0 .2rem;
  transition: color var(--trans);
}
.wheel-item-del:hover { color: var(--danger); }

.wheel-add-row {
  display: flex;
  gap: .5rem;
}

.wheel-canvas-wrap {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

#wheel-canvas {
  display: block;
  width: min(320px, 100%);
  height: auto;
}

.wheel-result {
  background: var(--surface2);
  border: 1px solid var(--accent);
  color: var(--accent2);
  font-size: 1.1rem;
  font-weight: 700;
  padding: .65rem 1.5rem;
  border-radius: 50px;
  text-align: center;
  animation: pop .3s ease;
}

@keyframes pop {
  0%   { transform: scale(.7); opacity: 0; }
  70%  { transform: scale(1.08); }
  100% { transform: scale(1); opacity: 1; }
}

/* ══════════════════════════════════════
   FOOTER
══════════════════════════════════════ */
footer {
  border-top: 1px solid var(--border);
  padding: 2rem 0;
  text-align: center;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

footer p { color: var(--text2); font-size: .85rem; }
footer .footer-note { font-size: .75rem; color: var(--text3); }

.micro-links {
  margin-top: .2rem;
  font-size: .62rem;
  color: #616184;
  opacity: .85;
  letter-spacing: .02em;
}

.micro-links a {
  color: #CFD8DC;
  text-decoration: none;
}

.micro-links a:hover {
  color: #e8f0f5;
  text-decoration: underline;
}

.micro-links span {
  margin: 0 .35rem;
}

.resource-heading {
  margin: 1.1rem 0 .55rem;
  font-size: 1rem;
  color: var(--accent2);
}

.resource-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: .5rem;
}

.resource-list a {
  display: block;
  padding: .6rem .75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg3);
  color: #CFD8DC;
  text-decoration: none;
  font-size: .85rem;
  transition: border-color var(--trans), color var(--trans), transform var(--trans);
}

.resource-list a:hover {
  border-color: var(--accent);
  color: #e8f0f5;
  transform: translateY(-1px);
}

/* ══════════════════════════════════════
   SCROLLBAR
══════════════════════════════════════ */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--accent); }

/* ══════════════════════════════════════
   RESPONSIVE
══════════════════════════════════════ */
@media (max-width: 600px) {
  html { scroll-padding-top: 8rem; }
  .tool-card[id] { scroll-margin-top: 8rem; }
  .container { padding: 0 .85rem; }
  .tool-card { padding: 1.25rem; }
  .header-inner { flex-direction: column; align-items: flex-start; }
  nav {
    width: 100%;
    gap: .2rem;
  }
  nav a {
    font-size: .75rem;
    padding: .3rem .55rem;
  }
  .resource-list {
    grid-template-columns: 1fr;
  }
  .micro-links {
    font-size: .58rem;
    line-height: 1.8;
  }
  .pw-output-wrap { flex-direction: column; }
  .btn-icon { align-self: flex-end; }
  .range-label { min-width: 0; width: 100%; }
  .form-grid { grid-template-columns: 1fr; }
  .tip-pct-row > * { flex: 1 1 80px; }
  .tip-pct-row .input-field.compact { max-width: none; }
  .qr-options { width: 100%; }
  .qr-options .form-label { flex: 1 1 120px; min-width: 0; }
  .conv-row { flex-direction: column; }
  .conv-arrow { transform: rotate(90deg); align-self: center; }
  .conv-side { min-width: 0; width: 100%; }
  .wheel-layout { flex-direction: column; align-items: stretch; }
  .wheel-options-panel { min-width: 0; }
  .wheel-canvas-wrap { width: 100%; }
  #wheel-canvas {
    width: min(280px, 100%);
    margin: 0 auto;
  }
}