/* ================================================================
   ToolStack — main stylesheet
   Design system ported from the Lovable "ToolStack Design System"
   reference build: teal primary + amber accent, warm cream base,
   Bricolage Grotesque display + Inter Tight body, layered shadows.
   ================================================================ */

:root {
  --radius: 14px;

  /* colors (oklch, from the design-system reference) */
  --bg: oklch(0.985 0.006 95);
  --surface: oklch(1 0 0);
  --surface-2: oklch(0.957 0.008 250);
  --text: oklch(0.215 0.02 250);
  --text-soft: oklch(0.42 0.02 250);
  --muted: oklch(0.535 0.02 250);
  --subtle: oklch(0.7 0.015 250);
  --border: oklch(0.915 0.008 250);
  --border-strong: oklch(0.865 0.012 250);
  --accent: oklch(0.52 0.115 195);          /* teal — primary action color */
  --accent-strong: oklch(0.46 0.11 195);
  --accent-soft: oklch(0.945 0.03 195);
  --accent-2: oklch(0.7 0.16 62);           /* amber — secondary accent */
  --success: oklch(0.62 0.14 155);
  --danger: oklch(0.575 0.2 25);
  --warning: oklch(0.75 0.15 75);
  --glass: oklch(1 0 0 / 68%);

  --gradient-accent: linear-gradient(103deg,
    oklch(0.52 0.115 195) 0%, oklch(0.58 0.12 215) 45%, oklch(0.7 0.16 62) 100%);
  --gradient-surface: linear-gradient(168deg, oklch(1 0 0) 0%, oklch(0.975 0.008 205) 100%);
  --gradient-hero:
    radial-gradient(ellipse 70% 60% at 12% -10%, oklch(0.52 0.115 195 / 14%) 0%, transparent 60%),
    radial-gradient(ellipse 55% 55% at 92% 0%, oklch(0.7 0.16 62 / 15%) 0%, transparent 62%);

  /* elevation */
  --shadow-xs: 0 1px 2px oklch(0.3 0.03 250 / 6%);
  --shadow: 0 1px 2px oklch(0.3 0.03 250 / 5%), 0 4px 10px -3px oklch(0.3 0.03 250 / 7%);
  --shadow-lg: 0 1px 2px oklch(0.3 0.03 250 / 4%), 0 10px 24px -8px oklch(0.3 0.03 250 / 10%),
    0 24px 48px -20px oklch(0.3 0.03 250 / 12%);
  --shadow-xl: 0 2px 4px oklch(0.3 0.03 250 / 5%), 0 18px 40px -12px oklch(0.3 0.03 250 / 14%),
    0 40px 80px -30px oklch(0.3 0.03 250 / 18%);
  --shadow-glow: 0 12px 40px -12px oklch(0.52 0.115 195 / 45%);

  /* typography */
  --font: "Inter Tight", ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Bricolage Grotesque", var(--font);
  --mono: "JetBrains Mono", ui-monospace, "Cascadia Code", Consolas, monospace;

  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --bg: oklch(0.19 0.018 258);
  --surface: oklch(0.235 0.02 258);
  --surface-2: oklch(0.275 0.02 258);
  --text: oklch(0.965 0.006 250);
  --text-soft: oklch(0.82 0.012 250);
  --muted: oklch(0.715 0.018 250);
  --subtle: oklch(0.52 0.02 250);
  --border: oklch(1 0 0 / 9%);
  --border-strong: oklch(1 0 0 / 16%);
  --accent: oklch(0.76 0.13 190);
  --accent-strong: oklch(0.82 0.12 190);
  --accent-soft: oklch(0.3 0.045 200);
  --accent-2: oklch(0.79 0.15 68);
  --success: oklch(0.75 0.15 158);
  --danger: oklch(0.68 0.18 25);
  --warning: oklch(0.82 0.15 80);
  --glass: oklch(0.21 0.02 258 / 72%);

  --gradient-accent: linear-gradient(103deg,
    oklch(0.7 0.13 195) 0%, oklch(0.66 0.13 240) 48%, oklch(0.79 0.15 68) 100%);
  --gradient-surface: linear-gradient(168deg, oklch(0.255 0.022 258) 0%, oklch(0.225 0.02 258) 100%);
  --gradient-hero:
    radial-gradient(ellipse 70% 60% at 12% -10%, oklch(0.76 0.13 190 / 16%) 0%, transparent 60%),
    radial-gradient(ellipse 55% 55% at 92% 0%, oklch(0.79 0.15 68 / 13%) 0%, transparent 62%);

  --shadow-xs: 0 1px 2px oklch(0 0 0 / 40%);
  --shadow: 0 1px 2px oklch(0 0 0 / 40%), 0 4px 12px -3px oklch(0 0 0 / 45%);
  --shadow-lg: 0 1px 2px oklch(0 0 0 / 40%), 0 12px 28px -10px oklch(0 0 0 / 55%),
    0 28px 56px -24px oklch(0 0 0 / 60%);
  --shadow-xl: 0 2px 4px oklch(0 0 0 / 45%), 0 20px 44px -14px oklch(0 0 0 / 60%),
    0 44px 88px -34px oklch(0 0 0 / 70%);
  --shadow-glow: 0 12px 40px -12px oklch(0.76 0.13 190 / 35%);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-feature-settings: "cv11", "ss01";
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 0.9375rem;
  -webkit-font-smoothing: antialiased;
  transition: background .25s ease, color .25s ease;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.022em;
  text-wrap: balance;
}

::selection { background: var(--accent-soft); color: var(--text); }

img { max-width: 100%; height: auto; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; text-underline-offset: 3px; }

.container { max-width: 1120px; margin: 0 auto; padding: 0 20px; }
.container-narrow { max-width: 800px; }
.muted { color: var(--muted); }
.small { font-size: .8125rem; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
.skip-link { position: absolute; left: -9999px; top: 0; background: var(--accent); color: #fff; padding: 8px 16px; z-index: 100; border-radius: 0 0 8px 0; }
.skip-link:focus { left: 0; }

.text-gradient {
  background-image: var(--gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* honeypot field — visually hidden from humans */
.hp-field { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; opacity: 0; }

/* ---------------- header (glass bar) ---------------- */

.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--glass);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow .3s var(--ease);
}
.site-header.scrolled { box-shadow: var(--shadow); }
.nav-wrap { display: flex; align-items: center; gap: 18px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-family: var(--display); font-weight: 700; font-size: 1.15rem; color: var(--text); letter-spacing: -.02em; }
.brand:hover { text-decoration: none; }

.main-nav { display: flex; gap: 4px; margin-left: 8px; }
.main-nav a {
  color: var(--text-soft); font-weight: 500; font-size: .9rem;
  padding: 8px 13px; border-radius: 9px; transition: background .15s, color .15s;
}
.main-nav a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
.main-nav a.active { color: var(--accent); background: var(--accent-soft); }

.nav-actions { margin-left: auto; display: flex; align-items: center; gap: 8px; }
.nav-search input {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  border-radius: 999px; padding: 7px 15px; font-size: .875rem; width: 150px;
  transition: width .25s var(--ease), border-color .15s, box-shadow .15s;
}
.nav-search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 16%, transparent); width: 195px; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; border-radius: 10px;
  background: transparent; border: 1px solid var(--border); color: var(--text-soft);
  cursor: pointer; transition: background .15s, color .15s, border-color .15s;
}
.icon-btn:hover { background: var(--surface-2); color: var(--text); border-color: var(--border-strong); }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
.icon-sun { display: none; }
.nav-burger { display: none; }

@media (max-width: 820px) {
  .nav-burger { display: inline-flex; }
  .nav-search { display: none; }
  .main-nav {
    display: none; position: absolute; top: 64px; left: 0; right: 0;
    flex-direction: column; background: var(--surface); border-bottom: 1px solid var(--border);
    padding: 12px 20px 16px; box-shadow: var(--shadow-lg);
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 12px 14px; font-size: 1.05rem; }
}

/* ---------------- buttons & chips ---------------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  font-family: inherit; font-weight: 600; font-size: .9rem;
  padding: 9px 18px; border-radius: 11px; border: 1px solid transparent;
  cursor: pointer; text-decoration: none !important;
  transition: transform .12s ease-out, box-shadow .3s var(--ease), filter .2s ease, background .2s ease;
}
.btn:active { transform: translateY(1px) scale(0.985); }
.btn-primary {
  background: var(--gradient-accent); color: #fff !important;
  box-shadow: var(--shadow);
}
.btn-primary:hover { box-shadow: var(--shadow-glow); filter: brightness(1.05); }
[data-theme="dark"] .btn-primary { color: oklch(0.15 0.02 220) !important; }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); box-shadow: var(--shadow-xs); }
.btn-ghost:hover { background: var(--surface-2); border-color: var(--border-strong); }
.btn-lg { padding: 13px 26px; font-size: 1rem; border-radius: 13px; }
.btn-inline { background: none; border: none; color: var(--accent); cursor: pointer; font: inherit; padding: 0; }
.btn-inline:hover { text-decoration: underline; }
.btn-row { display: flex; flex-wrap: wrap; gap: 8px; }

.chip {
  display: inline-block; font-size: .75rem; font-weight: 600; letter-spacing: .02em;
  color: var(--accent); background: var(--accent-soft);
  border: 1px solid color-mix(in oklab, var(--accent) 18%, transparent);
  padding: 3px 11px; border-radius: 999px; text-decoration: none !important;
}

/* ---------------- hero ---------------- */

.hero { padding: 76px 0 60px; overflow: hidden; position: relative; }
.hero::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image: var(--gradient-hero);
}
.hero::after {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 60% 55% at 50% 30%, black, transparent);
  mask-image: radial-gradient(ellipse 60% 55% at 50% 30%, black, transparent);
  opacity: .7;
}
.hero-inner { display: grid; grid-template-columns: 1.2fr .8fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
.eyebrow {
  display: inline-block; font-size: .75rem; font-weight: 600; letter-spacing: .14em;
  text-transform: uppercase; color: var(--accent);
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
  padding: 6px 16px; border-radius: 999px; margin: 0 0 20px;
}
.hero h1 { font-size: clamp(2.1rem, 4.8vw, 3.4rem); font-weight: 700; line-height: 1.08; letter-spacing: -.028em; margin: 0 0 18px; }
.lead { font-size: 1.0625rem; color: var(--text-soft); max-width: 58ch; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }

.hero-visual {
  position: relative; min-height: 320px;
  perspective: 1100px; transform-style: preserve-3d;
}
.hero-card {
  position: absolute; display: flex; flex-direction: column; gap: 2px;
  background: var(--gradient-surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 16px 22px; box-shadow: var(--shadow-lg);
}
.hero-card span { font-size: .72rem; font-weight: 600; letter-spacing: .14em; text-transform: uppercase; color: var(--subtle); }
.hero-card strong { font-family: var(--display); font-size: 1.45rem; letter-spacing: -.02em; }
.hero-card em { font-style: normal; color: var(--accent); font-weight: 600; font-size: .85rem; }
.hero-card:nth-child(2) em { color: var(--accent-2); }
.float-1 { top: 6%; left: 4%; --brx: 4deg; --bry: -8deg; animation: float 7s ease-in-out infinite; }
.float-2 { top: 40%; right: 2%; --brx: 2deg; --bry: 9deg; animation: float 7.5s ease-in-out .8s infinite; }
.float-3 { bottom: 4%; left: 18%; --brx: -3deg; --bry: -5deg; animation: float 7s ease-in-out .4s infinite; }
/* The float keyframes compose three var channels written by main.js:
   --py (scroll parallax), --rx/--ry (mouse tilt) on top of the
   --brx/--bry base 3D pose — so all effects run on one element. */
@keyframes float {
  0%, 100% {
    transform: perspective(800px)
      rotateX(calc(var(--brx, 0deg) + var(--rx, 0deg)))
      rotateY(calc(var(--bry, 0deg) + var(--ry, 0deg)))
      translateY(var(--py, 0px));
  }
  50% {
    transform: perspective(800px)
      rotateX(calc(var(--brx, 0deg) + var(--rx, 0deg)))
      rotateY(calc(var(--bry, 0deg) + var(--ry, 0deg)))
      translateY(calc(var(--py, 0px) - 12px));
  }
}

/* generic scroll-parallax consumer (orbs & hero cards have their own) */
[data-parallax] { transform: translate3d(0, var(--py, 0px), 0); }

/* ---------------- parallax decorations ---------------- */

.orb {
  position: absolute; border-radius: 50%; pointer-events: none;
  filter: blur(60px); will-change: transform;
  transform: translate3d(0, var(--py, 0px), 0);
}
.orb-1 {
  width: 380px; height: 380px; top: -120px; right: 8%;
  background: color-mix(in oklab, var(--accent-2) 26%, transparent);
}
.orb-2 {
  width: 320px; height: 320px; bottom: -140px; left: -6%;
  background: color-mix(in oklab, var(--accent) 24%, transparent);
}
.orb-cta-1 {
  width: 300px; height: 300px; top: -100px; left: 6%;
  background: oklch(1 0 0 / 18%); filter: blur(50px);
}
.orb-cta-2 {
  width: 260px; height: 260px; bottom: -110px; right: 8%;
  background: oklch(1 0 0 / 12%); filter: blur(50px);
}

/* ---------------- reading progress bar ---------------- */

.read-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 3px; z-index: 60;
  background: var(--gradient-accent);
  transform: scaleX(0); transform-origin: 0 50%;
  pointer-events: none;
}

/* ---------------- back to top ---------------- */

.to-top {
  position: fixed; right: 22px; bottom: 22px; z-index: 55;
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  background: var(--glass); color: var(--text);
  border: 1px solid var(--border-strong);
  backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-lg); cursor: pointer;
  opacity: 0; visibility: hidden; transform: translateY(12px);
  transition: opacity .35s var(--ease), transform .35s var(--ease), visibility .35s, box-shadow .2s;
}
.to-top.show { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { box-shadow: var(--shadow-glow); color: var(--accent); }

@media (max-width: 820px) {
  .hero { padding: 46px 0 34px; }
  .hero-inner { grid-template-columns: 1fr; gap: 24px; }
  .hero-visual { display: none; }
}

/* ---------------- sections & grids ---------------- */

.section { padding: 56px 0; }
.section-sm { padding: 22px 0; }
.section-alt { background: color-mix(in oklab, var(--surface-2) 55%, var(--bg)); }
.section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 28px; }
.section-head h2 { margin: 0; font-size: 1.75rem; letter-spacing: -.025em; }
.see-all { font-weight: 600; font-size: .9rem; white-space: nowrap; }
.group-title { font-size: 1.25rem; margin: 26px 0 14px; letter-spacing: -.015em; }

.grid { display: grid; gap: 22px; }
.tools-grid { grid-template-columns: repeat(3, 1fr); }
.posts-grid { grid-template-columns: repeat(3, 1fr); }
.posts-grid-2 { grid-template-columns: repeat(2, 1fr); }
.featured-grid { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 980px) { .tools-grid, .posts-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .tools-grid, .posts-grid, .posts-grid-2, .featured-grid { grid-template-columns: 1fr; } }

/* ---------------- cards ---------------- */

.card {
  background: var(--gradient-surface); border: 1px solid var(--border);
  border-radius: calc(var(--radius) + 5px); box-shadow: var(--shadow);
  transition: transform .35s var(--ease), box-shadow .35s var(--ease), border-color .35s var(--ease);
}
a.card { display: block; color: inherit; text-decoration: none !important; }
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--border-strong); }

.tool-card { padding: 24px 22px; position: relative; }
.tool-card h3 { margin: 16px 0 6px; font-size: 1.05rem; letter-spacing: -.01em; display: flex; align-items: center; gap: 6px; }
.tool-card h3::after { content: "↗"; font-size: .8rem; color: var(--subtle); transition: transform .3s var(--ease), color .2s; }
.tool-card:hover h3::after { transform: translate(2px, -2px); color: var(--accent); }
.tool-card p { margin: 0 0 6px; color: var(--muted); font-size: .875rem; line-height: 1.55; }
.tool-card .card-link { display: none; }
.tool-icon {
  width: 42px; height: 42px; border-radius: 12px;
  background: var(--accent-soft);
  border: 1px solid color-mix(in oklab, var(--accent) 20%, transparent);
  display: flex; align-items: center; justify-content: center; font-size: 1.2rem;
  transition: border-color .3s var(--ease);
}
.tool-card:hover .tool-icon { border-color: color-mix(in oklab, var(--accent) 40%, transparent); }
.tool-icon::before { content: "🧰"; }
.tool-icon[data-widget="pairconv"]::before { content: "🔁"; }
.tool-icon[data-widget="bmi"]::before { content: "⚖️"; }
.tool-icon[data-widget="age"]::before { content: "🎂"; }
.tool-icon[data-widget="percentage"]::before { content: "％"; }
.tool-icon[data-widget="unit"]::before { content: "📏"; }
.tool-icon[data-widget="wordcount"]::before { content: "📝"; }
.tool-icon[data-widget="caseconv"]::before { content: "🔤"; }

.post-card { overflow: hidden; display: flex; flex-direction: column; }
.card-media { display: block; aspect-ratio: 16/9; overflow: hidden; background: var(--surface-2); }
.card-media img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s var(--ease); }
.post-card:hover .card-media img { transform: scale(1.045); }
.card-media-fallback {
  width: 100%; height: 100%; display: flex; align-items: center; justify-content: center;
  background:
    radial-gradient(ellipse 80% 90% at 15% 0%, color-mix(in oklab, var(--accent) 16%, transparent), transparent 65%),
    radial-gradient(ellipse 70% 80% at 90% 100%, color-mix(in oklab, var(--accent-2) 14%, transparent), transparent 60%),
    var(--surface-2);
}
.card-media-fallback::before {
  content: attr(data-letter); font-family: var(--display); font-size: 3rem; font-weight: 700;
  color: color-mix(in oklab, var(--accent) 55%, transparent);
}
.card-body { padding: 20px 22px 22px; display: flex; flex-direction: column; gap: 9px; flex: 1; }
.card-meta { display: flex; align-items: center; flex-wrap: wrap; gap: 8px; font-size: .78rem; color: var(--muted); }
.card-title { margin: 0; font-size: 1.12rem; line-height: 1.32; letter-spacing: -.015em; }
.card-title a { color: var(--text); }
.card-title a:hover { color: var(--accent); text-decoration: none; }
.card-excerpt { margin: 0; color: var(--muted); font-size: .875rem; line-height: 1.6; flex: 1; }
.card-link { font-weight: 600; font-size: .875rem; color: var(--accent); }

/* ---------------- page scaffolding ---------------- */

.page-head { padding: 30px 0 8px; }
.tools-filter { display: flex; align-items: center; gap: 14px; margin: 18px 0 14px; }
.tools-filter input { width: min(420px, 100%); border-radius: 999px; padding: 11px 20px; }
.cat-jump { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 6px; }
.page-head h1 { font-size: clamp(1.9rem, 3.6vw, 2.6rem); font-weight: 700; letter-spacing: -.028em; margin: 0 0 10px; }

.breadcrumbs { padding: 18px 0 0; font-size: .8125rem; }
.breadcrumbs ol { list-style: none; display: flex; flex-wrap: wrap; gap: 6px; margin: 0; padding: 0; }
.breadcrumbs li + li::before { content: "›"; margin-right: 6px; color: var(--subtle); }
.breadcrumbs a { color: var(--muted); }
.breadcrumbs span { color: var(--text-soft); }

.layout-sidebar { display: grid; grid-template-columns: 1fr 300px; gap: 40px; align-items: start; padding-bottom: 60px; }
@media (max-width: 980px) { .layout-sidebar { grid-template-columns: 1fr; } }

.sidebar { display: flex; flex-direction: column; gap: 22px; position: sticky; top: 84px; }
.widget { background: var(--gradient-surface); border: 1px solid var(--border); border-radius: calc(var(--radius) + 5px); box-shadow: var(--shadow-xs); padding: 20px 22px; }
.widget h3 { margin: 0 0 12px; font-size: 1rem; }
.mini-list, .cat-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 9px; }
.mini-list a, .cat-list a { color: var(--text-soft); font-size: .9rem; }
.mini-list a:hover, .cat-list a:hover { color: var(--accent); }

.pagination { display: flex; align-items: center; justify-content: center; gap: 18px; margin: 36px 0 8px; }

/* ---------------- article prose ---------------- */

.post-article { min-width: 0; }
.post-head { padding: 20px 0 6px; }
.post-head h1 { font-size: clamp(1.8rem, 3.6vw, 2.5rem); font-weight: 700; line-height: 1.15; letter-spacing: -.026em; margin: 10px 0; }
.post-meta { color: var(--muted); font-size: .875rem; }
.post-cover { border-radius: calc(var(--radius) + 5px); margin: 12px 0 6px; box-shadow: var(--shadow); }
.tool-cover {
  width: 100%; height: auto; max-height: 210px; object-fit: cover; object-position: left center;
  border-radius: calc(var(--radius) + 5px); margin-top: 18px;
  border: 1px solid var(--border); box-shadow: var(--shadow);
}

.prose { font-size: 1.0625rem; line-height: 1.75; color: color-mix(in oklab, var(--text) 88%, var(--muted)); max-width: 74ch; }
.prose h2 { color: var(--text); font-size: 1.65rem; letter-spacing: -.022em; margin: 2.2em 0 .6em; }
.prose h3 { color: var(--text); font-size: 1.25rem; margin: 1.8em 0 .5em; }
.prose p { margin: 0 0 1.15em; }
.prose li { margin-bottom: .45em; }
.prose li::marker { color: var(--accent); }
.prose strong { color: var(--text); font-weight: 600; }
.prose a { text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.prose blockquote {
  margin: 1.4em 0; padding: 1.1em 1.3em; border-left: 3px solid var(--accent);
  background: var(--accent-soft); border-radius: 10px;
  font-family: var(--display); font-size: 1.15rem; line-height: 1.5; color: var(--text);
}
.prose pre {
  background: color-mix(in oklab, var(--text) 92%, var(--bg));
  color: oklch(0.96 0.01 250);
  border-radius: var(--radius);
  padding: 1.1em 1.25em; overflow-x: auto;
  font-family: var(--mono); font-size: .8125rem; line-height: 1.6;
  box-shadow: var(--shadow);
}
.prose code { font-family: var(--mono); font-size: .85em; background: var(--surface-2); border: 1px solid var(--border); padding: .15em .4em; border-radius: 6px; }
.prose pre code { background: none; border: none; padding: 0; }
.prose img { border-radius: 10px; }
.prose table { border-collapse: collapse; width: 100%; margin: 1.2em 0; }
.prose th, .prose td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
.prose th { background: var(--surface-2); color: var(--text); }

.post-tags { display: flex; flex-wrap: wrap; gap: 8px; margin: 26px 0 10px; }

.share-bar {
  display: flex; align-items: center; flex-wrap: wrap; gap: 14px;
  margin: 26px 0; padding: 14px 18px;
  background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); font-size: .875rem;
}
.share-bar span { color: var(--muted); font-weight: 600; }

/* ---------------- comments ---------------- */

.comments-section { margin-top: 40px; border-top: 1px solid var(--border); padding-top: 28px; }
.comments-section h2 { font-size: 1.4rem; }
.comment { padding: 14px 0; border-bottom: 1px solid var(--border); }
.comment-head { margin: 0 0 4px; }
.comment p { margin: 0; color: var(--text-soft); }
.comment-form { margin-top: 22px; }

/* ---------------- forms ---------------- */

.stack { display: flex; flex-direction: column; gap: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 640px) { .form-row { grid-template-columns: 1fr; } }
label { display: flex; flex-direction: column; gap: 6px; font-weight: 600; font-size: .875rem; color: var(--text); }
input[type="text"], input[type="email"], input[type="search"], input[type="number"],
input[type="date"], input[type="password"], input[type="url"], textarea, select {
  font-family: inherit; font-size: .9375rem;
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border-strong); border-radius: 10px; padding: 10px 14px;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 16%, transparent);
}
textarea { resize: vertical; }
.contact-form { padding: 28px; }
.form-success { color: var(--success); font-weight: 600; }
.form-success.card { padding: 18px 22px; margin-bottom: 20px; border-color: color-mix(in oklab, var(--success) 40%, var(--border)); }

.search-form { display: flex; gap: 10px; max-width: 560px; margin-top: 8px; }
.search-form input { flex: 1; }

.newsletter-form { display: flex; gap: 8px; margin-top: 8px; }
.newsletter-form input { flex: 1; min-width: 0; }

/* ---------------- tool widgets ---------------- */

.tool-widget { padding: 28px; margin: 18px 0 10px; box-shadow: var(--shadow-lg); }
.widget-form textarea { width: 100%; font-size: 1rem; }

.seg-control { display: inline-flex; background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 4px; gap: 4px; }
.seg {
  font: inherit; font-weight: 600; font-size: .875rem; border: none; background: transparent;
  color: var(--muted); padding: 7px 16px; border-radius: 9px; cursor: pointer;
  transition: color .2s, background .2s;
}
.seg.active { background: var(--surface); color: var(--accent); box-shadow: var(--shadow-xs); }

.tool-result { background: var(--surface-2); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px 26px; text-align: center; }
.result-number { font-family: var(--display); font-size: 2.8rem; font-weight: 700; letter-spacing: -.035em; margin: 0; color: var(--accent); }
.result-label { font-size: 1.05rem; font-weight: 600; margin: 4px 0 12px; }

.bmi-scale { position: relative; display: flex; height: 10px; border-radius: 999px; overflow: visible; margin: 18px 4px 8px; }
.bmi-band { height: 100%; }
.bmi-band:first-child { border-radius: 999px 0 0 999px; }
.bmi-band:last-child { border-radius: 0 999px 999px 0; }
.b-under { flex: 18.5; background: oklch(0.65 0.12 240); }
.b-healthy { flex: 6.4; background: var(--success); }
.b-over { flex: 5; background: var(--warning); }
.b-obese { flex: 10; background: var(--danger); }
.bmi-marker {
  position: absolute; top: -5px; width: 4px; height: 20px; border-radius: 3px;
  background: var(--text); transition: left .3s var(--ease); left: 0;
}

.stat-row { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; margin-top: 8px; }
.stat {
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
  box-shadow: var(--shadow-xs);
  padding: 10px 16px; display: flex; flex-direction: column; min-width: 104px;
}
.stat strong { font-family: var(--display); font-size: 1.2rem; letter-spacing: -.01em; }
.stat span { font-size: .75rem; color: var(--muted); }

.pct-block { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; }
.pct-q { margin: 0; font-weight: 600; display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.pct-q input { width: 108px; text-align: center; }
.pct-answer { margin: 10px 0 0; font-family: var(--display); font-size: 1.45rem; font-weight: 700; letter-spacing: -.02em; color: var(--accent); }

.unit-row { grid-template-columns: 1fr auto 1fr; align-items: end; }
@media (max-width: 640px) { .unit-row { grid-template-columns: 1fr; } }
.unit-row select { margin-top: 6px; }
.swap-btn { margin-bottom: 4px; font-size: 1.1rem; align-self: end; }

/* ---------------- FAQ ---------------- */

.faq-section { margin: 34px 0; }
.faq-section h2 { font-size: 1.45rem; letter-spacing: -.02em; }
.faq-item {
  background: var(--gradient-surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 0 20px; margin-bottom: 10px; box-shadow: var(--shadow-xs);
}
.faq-item summary {
  cursor: pointer; font-weight: 600; padding: 15px 0; list-style: none; position: relative; padding-right: 30px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+"; position: absolute; right: 2px; top: 50%; transform: translateY(-50%);
  font-size: 1.3rem; color: var(--accent); transition: transform .25s var(--ease);
}
.faq-item[open] summary::after { transform: translateY(-50%) rotate(45deg); }
.faq-item p { margin: 0 0 16px; color: var(--text-soft); }

/* ---------------- ads ---------------- */

.ad-slot { margin: 22px auto; text-align: center; }
.ad-header, .ad-in-content { max-width: 1120px; padding: 0 20px; }
.ad-placeholder {
  display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 4px;
  min-height: 96px; border: 1px dashed var(--border-strong); border-radius: 14px;
  background: color-mix(in oklab, var(--surface-2) 50%, transparent); color: var(--subtle);
  font-size: .6875rem; letter-spacing: .16em; text-transform: uppercase; font-weight: 500;
}
.ad-sidebar .ad-placeholder { min-height: 250px; }

/* ---------------- CTA band ---------------- */

.cta-band { background: var(--gradient-accent); position: relative; overflow: hidden; }
.cta-band .cta-inner { position: relative; z-index: 1; }
.cta-inner { text-align: center; padding: 30px 20px; color: #fff; }
.cta-inner h2 { font-size: 1.9rem; margin: 0 0 8px; letter-spacing: -.025em; }
.cta-inner p { opacity: .92; margin: 0 0 22px; }
.cta-band .btn-primary { background: #fff; color: var(--accent-strong) !important; box-shadow: var(--shadow-lg); }
.cta-band .btn-primary:hover { filter: none; box-shadow: var(--shadow-xl); }

/* ---------------- footer ---------------- */

.site-footer { border-top: 1px solid var(--border); background: var(--surface); margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.4fr; gap: 34px; padding: 46px 20px 26px; }
@media (max-width: 860px) { .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-col h3 { font-family: var(--font); font-size: .78rem; text-transform: uppercase; letter-spacing: .14em; color: var(--subtle); margin: 0 0 14px; }
.footer-col a { display: block; color: var(--text-soft); padding: 4px 0; font-size: .9rem; }
.footer-col a:hover { color: var(--accent); text-decoration: none; }
.footer-about p { color: var(--text-soft); font-size: .9rem; }
.footer-about .brand { margin-bottom: 6px; }
.social-links { display: flex; gap: 14px; margin-top: 10px; }
.footer-bottom {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px;
  border-top: 1px solid var(--border); padding: 18px 20px; font-size: .8125rem; color: var(--muted);
}
.footer-bottom p { margin: 0; }
.footer-bottom a { color: var(--muted); }

/* ---------------- error page ---------------- */

.error-page { text-align: center; padding: 90px 20px 110px; }
.error-code {
  font-family: var(--display); font-size: 6.5rem; font-weight: 800; margin: 0; letter-spacing: -.05em;
  background-image: var(--gradient-accent);
  -webkit-background-clip: text; background-clip: text; color: transparent; opacity: .5;
}
.error-page .hero-actions { justify-content: center; }

/* ================================================================
   3D motion system
   - .reveal: elements rise in with a perspective rotateX as they
     enter the viewport (scoped to .js so no-JS users/crawlers see
     everything immediately).
   - .tilt: cards tilt toward the cursor via --rx/--ry from main.js.
   - The visible/tilt transforms share the same var channels so the
     effects compose instead of overwriting each other.
   ================================================================ */

.js .reveal {
  opacity: 0;
  transform: perspective(1000px) translateY(30px) rotateX(9deg) scale(.97);
  transform-origin: 50% 85%;
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.js .reveal.visible {
  opacity: 1;
  transform: perspective(1000px)
    rotateX(calc(var(--rotx, 0deg) + var(--rx, 0deg)))
    rotateY(var(--ry, 0deg))
    translateY(var(--lift, 0px));
}

/* staggered entrance inside grids */
.grid > .reveal:nth-child(2) { transition-delay: .07s; }
.grid > .reveal:nth-child(3) { transition-delay: .14s; }
.grid > .reveal:nth-child(4) { transition-delay: .21s; }
.grid > .reveal:nth-child(5) { transition-delay: .28s; }
.grid > .reveal:nth-child(6) { transition-delay: .35s; }

/* 3D cursor tilt (class added by main.js on hover-capable devices) */
.tilt {
  will-change: transform;
  transition:
    transform .22s var(--ease),
    opacity .7s var(--ease),
    box-shadow .35s var(--ease),
    border-color .35s var(--ease);
  transform: perspective(900px)
    rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg))
    translateY(var(--lift, 0px));
}
.card.tilt:hover {
  transform: perspective(900px)
    rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg))
    translateY(var(--lift, 0px));
}
.tilt:hover { --lift: -5px; }

@media (prefers-reduced-motion: reduce) {
  .js .reveal, .reveal { opacity: 1; transform: none; transition: none; }
  .tilt, .card.tilt:hover { transform: none; }
  .float-1, .float-2, .float-3 { animation: none; }
  [data-parallax] { transform: none; }
  html { scroll-behavior: auto; }
}