/* =============================================
   COMPARING HEIGHTS — style.css
   Design: Dark premium + electric blue/teal
   Font: Clash Display + DM Sans
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap');

:root {
  --bg:        #0b0e17;
  --bg2:       #111520;
  --bg3:       #161c2d;
  --glass:     rgba(255,255,255,0.04);
  --glass-b:   rgba(255,255,255,0.09);
  --accent:    #3b82f6;
  --accent2:   #06b6d4;
  --accent3:   #8b5cf6;
  --text:      #e8ecf4;
  --text2:     #94a3b8;
  --text3:     #475569;
  --border:    rgba(255,255,255,0.08);
  --border2:   rgba(59,130,246,0.3);
  --male:      #3b82f6;
  --female:    #ec4899;
  --shadow:    0 8px 32px rgba(0,0,0,0.4);
  --r:         14px;
}

/* LIGHT MODE */
body.light {
  --bg:        #f0f4ff;
  --bg2:       #e8eeff;
  --bg3:       #ffffff;
  --glass:     rgba(255,255,255,0.6);
  --glass-b:   rgba(255,255,255,0.9);
  --text:      #1e293b;
  --text2:     #475569;
  --text3:     #94a3b8;
  --border:    rgba(0,0,0,0.08);
  --border2:   rgba(59,130,246,0.4);
  --shadow:    0 8px 32px rgba(0,0,0,0.1);
}

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

html { scroll-behavior: smooth; overflow-x: hidden; width: 100%; }

body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.6;
  transition: background 0.3s, color 0.3s;
  overflow-x: hidden;
  width: 100%;
}

/* Background mesh */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 20% 10%, rgba(59,130,246,0.06) 0%, transparent 60%),
    radial-gradient(ellipse 60% 40% at 80% 80%, rgba(139,92,246,0.05) 0%, transparent 60%),
    radial-gradient(ellipse 50% 60% at 50% 50%, rgba(6,182,212,0.03) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

body > * { position: relative; z-index: 1; }

/* ---- SCROLLBAR ---- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }

/* ---- TYPOGRAPHY ---- */
h1,h2,h3,h4 { font-weight: 700; line-height: 1.2; }
h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.2rem); letter-spacing: -0.02em; }
h3 { font-size: clamp(1.1rem, 2vw, 1.4rem); }

/* ---- GLASS CARD ---- */
.glass {
  background: var(--glass);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--r);
}
.glass-strong {
  background: var(--glass-b);
  backdrop-filter: blur(30px);
  -webkit-backdrop-filter: blur(30px);
  border: 1px solid var(--border2);
  border-radius: var(--r);
}

/* ---- NAVBAR ---- */
#navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: rgba(11,14,23,0.85);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s;
}
#navbar::before {
  content: "";
  position: absolute;
  inset: 0;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: -1;
  pointer-events: none;
}
body.light #navbar {
  background: rgba(240,244,255,0.85);
}
.nav-container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 60px;
  gap: 1rem;
  flex-wrap: wrap;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  flex-wrap: wrap;
}
.hamburger {
  display: none !important;
}
@media (max-width: 640px) {
  .nav-container {
    padding: 0.5rem 1rem;
    gap: 0.5rem;
  }
  .nav-logo {
    font-size: 1.15rem;
  }
  .nav-actions {
    gap: 0.25rem;
  }
  .hamburger {
    display: inline-flex !important;
  }
  .nav-links {
    position: absolute;
    top: 100%;
    right: -260px;
    width: 220px;
    background: var(--bg);
    border-left: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    border-radius: 0 0 0 16px;
    flex-direction: column;
    padding: 1rem;
    gap: 0.5rem;
    display: flex;
    box-shadow: -4px 4px 16px rgba(0,0,0,0.15);
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  }
  .nav-links.open {
    right: 0;
  }
  .nav-link {
    width: 100%;
    text-align: right;
    padding: 0.75rem 1rem;
    font-size: 1rem;
    border-radius: 8px;
    background: transparent;
  }
}
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.nav-logo {
  font-size: 1.25rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  white-space: nowrap;
}
.nav-link {
  color: var(--text2);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  transition: color 0.2s, background 0.2s;
}
.nav-link:hover, .nav-link.active {
  color: var(--text);
  background: var(--glass);
}

/* ---- BUTTONS ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.2rem;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.875rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: 'DM Sans', sans-serif;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  box-shadow: 0 4px 20px rgba(59,130,246,0.35);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(59,130,246,0.5);
}
.btn-ghost {
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--text2);
}
.btn-ghost:hover {
  background: var(--glass-b);
  color: var(--text);
  border-color: var(--border2);
}
.btn-danger {
  background: rgba(239,68,68,0.15);
  border: 1px solid rgba(239,68,68,0.3);
  color: #f87171;
}
.btn-danger:hover { background: rgba(239,68,68,0.25); }
.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; border-radius: 8px; }
.btn-icon {
  padding: 0.45rem;
  border-radius: 9px;
  background: var(--glass);
  border: 1px solid var(--border);
  color: var(--text2);
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}
.btn-icon:hover { background: var(--glass-b); color: var(--text); }

/* ---- INPUTS ---- */
.input {
  width: 100%;
  padding: 0.6rem 0.9rem;
  background: var(--glass);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.9rem;
  transition: border-color 0.2s, box-shadow 0.2s;
  outline: none;
}
.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(59,130,246,0.15);
}
.input::placeholder { color: var(--text3); }
select.input option { background: var(--bg2); color: var(--text); }

/* ---- TOGGLE GENDER ---- */
.gender-toggle {
  display: flex;
  border-radius: 10px;
  overflow: hidden;
  border: 1px solid var(--border);
}
.gender-toggle button {
  flex: 1;
  padding: 0.5rem 0.7rem;
  border: none;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  transition: all 0.2s;
  background: transparent;
  color: var(--text2);
}
.gender-toggle button.active-m {
  background: rgba(59,130,246,0.25);
  color: #93c5fd;
}
.gender-toggle button.active-f {
  background: rgba(236,72,153,0.25);
  color: #f9a8d4;
}

/* ---- UNIT TOGGLE ---- */
.unit-toggle {
  display: flex;
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: hidden;
}
.unit-toggle button {
  flex: 1;
  padding: 0.35rem 0.75rem;
  border: none;
  cursor: pointer;
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 600;
  background: transparent;
  color: var(--text3);
  transition: all 0.2s;
}
.unit-toggle button.active {
  background: var(--accent);
  color: #fff;
}

/* ---- PERSON CARD ---- */
.person-card {
  position: relative;
  padding: 1rem;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--border);
  transition: all 0.2s;
  cursor: grab;
  user-select: none;
}
.person-card:active { cursor: grabbing; }
.person-card.dragging {
  opacity: 0.5;
  border-color: var(--accent);
  transform: scale(0.97);
}
.person-card.drag-over {
  border-color: var(--accent2);
  background: rgba(6,182,212,0.08);
}
.person-card .color-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  flex-shrink: 0;
}

/* ---- VISUALIZER ---- */
#visualizer-wrap {
  width: 100%;
  overflow-x: auto;
  padding-bottom: 0.5rem;
}
#visualizer {
  width: 100%;
  min-height: 560px;
}
.person-figure svg {
  display: block;
  filter: drop-shadow(0 6px 18px rgba(0,0,0,0.35));
  transition: filter 0.2s;
}
.person-figure:hover svg {
  filter: drop-shadow(0 8px 24px rgba(0,0,0,0.5)) brightness(1.1);
}
.groundline {
  position: absolute;
  bottom: 0;
  left: 1.5rem;
  right: 1.5rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--border2), transparent);
}

/* ---- DIFF BADGE ---- */
.diff-badge {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #fff;
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(59,130,246,0.4);
}

/* ---- HEIGHT RULER ---- */
.ruler {
  position: absolute;
  left: 0.5rem;
  bottom: 0;
  top: 1.5rem;
  width: 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  pointer-events: none;
}
.ruler-tick {
  display: flex;
  align-items: center;
  gap: 3px;
}
.ruler-tick span {
  font-size: 0.6rem;
  color: var(--text3);
  white-space: nowrap;
}
.ruler-tick::before {
  content: '';
  display: block;
  width: 6px;
  height: 1px;
  background: var(--text3);
}

/* ---- CELEBRITY CARD ---- */
.celeb-card {
  padding: 0.7rem 1rem;
  border-radius: 10px;
  background: var(--glass);
  border: 1px solid var(--border);
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.celeb-card:hover {
  background: var(--glass-b);
  border-color: var(--accent);
  transform: translateY(-2px);
}
.celeb-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}

/* ---- DIFF DISPLAY ---- */
#diff-display {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}
.diff-item {
  flex: 1;
  min-width: 120px;
  padding: 1rem;
  border-radius: 12px;
  background: var(--glass);
  border: 1px solid var(--border);
  text-align: center;
}
.diff-item .diff-val {
  font-size: 1.6rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.diff-item .diff-label {
  font-size: 0.75rem;
  color: var(--text3);
  margin-top: 0.25rem;
}

/* ---- TOAST ---- */
#toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(6rem);
  background: var(--bg3);
  border: 1px solid var(--border2);
  padding: 0.75rem 1.5rem;
  border-radius: 999px;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.3s;
  z-index: 999;
  opacity: 0;
  white-space: nowrap;
}
#toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* ---- CONVERTER WIDGET ---- */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 1rem;
}
@media (max-width: 480px) {
  .converter-grid { grid-template-columns: 1fr; }
}
.big-val {
  font-size: 2.2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- HERO ---- */
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border2);
  background: rgba(59,130,246,0.08);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent2);
  margin-bottom: 1rem;
}

/* ---- STATS BAR ---- */
.stat-item {
  text-align: center;
  padding: 1rem;
}
.stat-num {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.78rem; color: var(--text3); margin-top: 0.2rem; }

/* ---- SEO CONTENT ---- */
.content-section h2 { margin-bottom: 1rem; }
.content-section p { color: var(--text2); margin-bottom: 0.75rem; line-height: 1.75; }
.content-section ul { color: var(--text2); padding-left: 1.25rem; }
.content-section ul li { margin-bottom: 0.4rem; }

/* ---- FAQ ---- */
.faq-item {
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color 0.2s;
}
.faq-item.open { border-color: var(--border2); }
.faq-q {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  background: var(--glass);
  border: none;
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transition: background 0.2s;
}
.faq-q:hover { background: var(--glass-b); }
.faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease, padding 0.3s;
  padding: 0 1.25rem;
  background: var(--bg2);
  color: var(--text2);
  font-size: 0.9rem;
  line-height: 1.7;
}
.faq-item.open .faq-a { max-height: 300px; padding: 1rem 1.25rem; }
.faq-arrow { transition: transform 0.3s; }
.faq-item.open .faq-arrow { transform: rotate(180deg); }

/* ---- COLOR PICKER SWATCHES ---- */
.color-swatch {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.15s;
  flex-shrink: 0;
}
.color-swatch:hover, .color-swatch.active { border-color: var(--text); transform: scale(1.15); }

/* ---- SECTION DIVIDER ---- */
.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent2);
  margin-bottom: 0.5rem;
}
.section-tag::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--accent2);
  border-radius: 1px;
}

/* ---- GRADIENT TEXT ---- */
.grad { 
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.grad2 { 
  background: linear-gradient(135deg, #8b5cf6, #ec4899);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ---- PAGE TOOL CARDS ---- */
.tool-card {
  padding: 1.5rem;
  border-radius: 16px;
  background: var(--glass);
  border: 1px solid var(--border);
  transition: all 0.25s;
  display: block;
  text-decoration: none;
  color: var(--text);
}
.tool-card:hover {
  background: var(--glass-b);
  border-color: var(--border2);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(59,130,246,0.15);
}
.tool-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

/* ---- RANGE INPUT ---- */
input[type=range] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 6px;
  background: var(--bg3);
  border-radius: 3px;
  outline: none;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(59,130,246,0.5);
}

/* ---- FOOTER ---- */
footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
}

/* ---- ANIMATIONS ---- */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.fade-up { animation: fadeUp 0.5s ease both; }
.fade-up-1 { animation-delay: 0.1s; }
.fade-up-2 { animation-delay: 0.2s; }
.fade-up-3 { animation-delay: 0.3s; }
.float { animation: float 3s ease-in-out infinite; }

/* ---- RESPONSIVE GRID ---- */
.responsive-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}
.responsive-grid > div {
  min-width: 0;
}

/* ---- MOBILE ---- */
@media (max-width: 768px) {
  .responsive-grid {
    grid-template-columns: 1fr !important;
  }
}

@media (max-width: 640px) {
  #visualizer { min-height: 380px; }
  .converter-grid { gap: 0.5rem; }
}

/* ---- PRESET TAG ---- */
.preset-tag {
  padding: 0.3rem 0.8rem;
  border-radius: 999px;
  background: var(--glass);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--text2);
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.preset-tag:hover {
  background: rgba(59,130,246,0.15);
  border-color: var(--accent);
  color: var(--text);
}

/* ---- SHARE MODAL ---- */
#share-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
  padding: 1rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
#share-modal.open { opacity: 1; pointer-events: all; }
#share-modal .modal-box {
  background: var(--bg2);
  border: 1px solid var(--border2);
  border-radius: 20px;
  padding: 2rem;
  width: 100%;
  max-width: 480px;
  transform: scale(0.9);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}
#share-modal.open .modal-box { transform: scale(1); }

/* ---- PROGRESS BAR ---- */
.progress-bar {
  height: 8px;
  border-radius: 4px;
  background: var(--bg3);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  border-radius: 4px;
  transition: width 0.5s ease;
}

/* ---- TAB NAV ---- */
.tab-nav {
  display: flex;
  gap: 0.25rem;
  background: var(--glass);
  padding: 0.25rem;
  border-radius: 10px;
  border: 1px solid var(--border);
}
.tab-btn {
  flex: 1;
  padding: 0.45rem 0.75rem;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text2);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}
.tab-btn.active {
  background: var(--accent);
  color: #fff;
}

/* ---- CELEB SEARCH ---- */
#celeb-search-input { margin-bottom: 0.75rem; }
.celeb-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.6rem;
  max-height: 280px;
  overflow-y: auto;
  padding-right: 0.25rem;
}