/* ============================================
   BFK Design Lab v2 — Huly-grade preview
   Cyan / white / black · liquid glass · light+dark
   ============================================ */

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
img { max-width: 100%; display: block; }
a { color: inherit; }
button { font: inherit; }
input, select, textarea { font: inherit; }
::selection { background: var(--cyan); color: var(--cyan-ink); }

/* --- Design tokens: dark (default) --- */
:root {
  --bg: #050608;
  --bg2: #0a0c0f;
  --ink: #f7f8f9;
  --mute: #6b7378;
  --line: rgba(255,255,255,.07);
  --line-strong: rgba(255,255,255,.13);
  --cyan: #7ef3ff;
  --cyan-ink: #04262b;
  --cyan-glow: rgba(126,243,255,.20);
  --glass-fill: linear-gradient(180deg, rgba(255,255,255,.085), rgba(255,255,255,.022));
  --glass-border: rgba(255,255,255,.10);
  --glass-hi: inset 0 1px 0 rgba(255,255,255,.38);
  --shadow: 0 28px 70px rgba(0,0,0,.55);
  --shadow-soft: 0 12px 40px rgba(0,0,0,.3);
  --orb-1: rgba(126,243,255,.18);
  --orb-2: rgba(255,255,255,.07);
  --orb-3: rgba(126,243,255,.10);
  --radius: 28px;
  --radius-sm: 14px;
  --radius-xs: 8px;
  --nav-h: 58px;
  --max: 1120px;
}

/* --- Design tokens: light --- */
[data-theme="light"] {
  --bg: #e8eef2;
  --bg2: #dde6ec;
  --ink: #0b0d10;
  --mute: #5b6368;
  --line: rgba(11,13,16,.07);
  --line-strong: rgba(11,13,16,.12);
  --cyan: #0496ab;
  --cyan-ink: #ffffff;
  --cyan-glow: rgba(4,150,171,.10);
  --glass-fill: linear-gradient(180deg, rgba(255,255,255,.72), rgba(255,255,255,.40));
  --glass-border: rgba(255,255,255,.55);
  --glass-hi: inset 0 1px 0 rgba(255,255,255,.88);
  --shadow: 0 24px 60px rgba(12,15,17,.10);
  --shadow-soft: 0 8px 24px rgba(12,15,17,.06);
  --orb-1: rgba(4,150,171,.10);
  --orb-2: rgba(255,255,255,.5);
  --orb-3: rgba(4,150,171,.06);
}

/* --- Base --- */
html, body { background: var(--bg); color: var(--ink); }
body {
  min-height: 100vh;
  font: 16px/1.55 "Source Sans 3", system-ui, -apple-system, sans-serif;
  letter-spacing: -.005em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* --- Atmosphere: orbs behind glass --- */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(560px 560px at 8% 0%, var(--orb-1), transparent 62%),
    radial-gradient(480px 480px at 92% 12%, var(--orb-2), transparent 58%),
    radial-gradient(640px 640px at 50% 95%, var(--orb-3), transparent 62%);
  animation: orbdrift 32s ease-in-out infinite;
}
@keyframes orbdrift {
  0%,100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(18px,-12px) scale(1.015); }
}

/* --- Utilities --- */
.glass {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(36px) saturate(160%);
  backdrop-filter: blur(36px) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow), var(--glass-hi);
  border-radius: var(--radius);
}
.glass-soft {
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(28px) saturate(150%);
  backdrop-filter: blur(28px) saturate(150%);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.kicker {
  margin: 0 0 12px;
  color: var(--mute);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.tnum { font-variant-numeric: tabular-nums; }
.muted { color: var(--mute); }
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* --- Layout containers --- */
.content {
  position: relative; z-index: 1;
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
}

/* --- Top navigation (sticky frost) --- */
.topnav {
  position: sticky; top: 0; z-index: 100;
  -webkit-backdrop-filter: blur(36px) saturate(160%);
  backdrop-filter: blur(36px) saturate(160%);
  background: var(--glass-fill);
  border-bottom: 1px solid var(--line);
}
.topnav-inner {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  height: var(--nav-h);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none; font-weight: 600; font-size: 15px;
  white-space: nowrap;
}
.brand-logo { width: 26px; height: auto; }
.topnav-links {
  display: flex; gap: 24px; align-items: center;
  margin-left: auto; margin-right: 8px;
}
.topnav-links a {
  color: var(--mute); text-decoration: none; font-size: 14px; font-weight: 500;
  transition: color .2s;
}
.topnav-links a:hover,
.topnav-links a[aria-current="page"] { color: var(--ink); }
.topnav-actions { display: flex; gap: 10px; align-items: center; }

/* --- Icon button (theme toggle) --- */
.icon-btn {
  display: flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background: transparent; color: var(--ink);
  cursor: pointer; transition: border-color .2s, background .2s;
}
.icon-btn:hover { border-color: var(--ink); }
.icon-btn svg { width: 17px; height: 17px; }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 42px; padding: 0 18px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: transparent; color: var(--ink);
  font-size: 14px; font-weight: 500;
  text-decoration: none; cursor: pointer; white-space: nowrap;
  transition: border-color .2s, filter .2s, transform .12s;
}
.btn:hover { border-color: var(--ink); }
.btn:active { transform: scale(.98); }
.btn.primary {
  background: var(--cyan); color: var(--cyan-ink);
  border-color: transparent; font-weight: 600;
}
.btn.primary:hover { filter: brightness(1.08); border-color: transparent; }
.btn.full { width: 100%; }
.btn.sm { min-height: 36px; padding: 0 14px; font-size: 13px; }

/* --- Typography --- */
h1 {
  margin: 0 0 16px;
  font-size: clamp(32px, 5.5vw, 52px);
  line-height: 1.02;
  letter-spacing: -.04em;
  font-weight: 500;
}
h2 {
  margin: 0 0 14px;
  font-size: clamp(22px, 3.5vw, 32px);
  line-height: 1.1;
  letter-spacing: -.03em;
  font-weight: 500;
}
.lead {
  margin: 0 0 24px;
  color: var(--mute);
  font-size: 17px;
  line-height: 1.5;
  max-width: 520px;
}
.text-link {
  color: var(--ink);
  font-size: 14px; font-weight: 500;
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 1px;
  transition: border-color .2s;
}
.text-link:hover { border-color: var(--cyan); }

/* --- Floating window chrome (Huly product window) --- */
.window {
  border-radius: var(--radius);
  background: var(--glass-fill);
  -webkit-backdrop-filter: blur(36px) saturate(160%);
  backdrop-filter: blur(36px) saturate(160%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow), var(--glass-hi);
  overflow: hidden;
}
.winbar {
  display: flex; align-items: center; gap: 7px;
  padding: 14px 18px;
  border-bottom: 1px solid var(--line);
}
.winbar i {
  width: 9px; height: 9px; border-radius: 50%;
  background: rgba(255,255,255,.20);
}
[data-theme="light"] .winbar i { background: rgba(11,13,16,.12); }
.winbar-label {
  margin-left: 10px;
  color: var(--mute); font-size: 12px; font-weight: 500;
  letter-spacing: .02em;
}
.winbody { padding: 24px 26px 26px; }

/* --- Home: hero --- */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 44px;
  align-items: center;
  padding: 56px 0 32px;
}
.hero-text { min-width: 0; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }

/* --- Home: sample week sheet --- */
.sheet { display: grid; gap: 0; }
.sheet-row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 16px;
}
.sheet-row span { color: var(--mute); }
.sheet-row b { font-weight: 600; font-variant-numeric: tabular-nums; }
.sheet-keep {
  padding: 18px 0 4px;
  border-bottom: none;
  align-items: baseline;
}
.sheet-keep-val {
  font-size: clamp(34px, 5vw, 44px);
  font-weight: 500;
  letter-spacing: -.04em;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}
.sheet-keep-label { color: var(--ink); font-weight: 500; font-size: 16px; }
.sheet-rate {
  font-size: 13px; color: var(--mute);
  font-variant-numeric: tabular-nums;
  margin-top: 2px;
}

/* --- Home: sections --- */
.section {
  padding: 56px 0;
  border-top: 1px solid var(--line);
}
.section-inner { max-width: 680px; }
.section h2 { margin-bottom: 16px; }
.section p { margin: 0 0 16px; color: var(--mute); font-size: 17px; line-height: 1.55; }

/* --- Home: affiliate math strip --- */
.aff-strip {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  padding: 28px 32px;
}
.aff-strip-math {
  font-size: 20px; font-weight: 500; letter-spacing: -.02em;
}
.aff-strip-math em {
  font-style: normal; color: var(--cyan);
}

/* --- Kits: controls --- */
.controls {
  display: grid;
  grid-template-columns: 1fr 180px 180px;
  gap: 12px;
  margin: 28px 0 24px;
}
.controls input, .controls select {
  min-height: 46px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  background: var(--bg2);
  color: var(--ink);
  padding: 0 14px;
  transition: border-color .2s;
}
.controls input:focus, .controls select:focus {
  outline: none; border-color: var(--cyan);
}
.controls input::placeholder { color: var(--mute); }

/* --- Kits: grid + cards --- */
.kit-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding-bottom: 40px;
}
.kit-card {
  display: flex; flex-direction: column;
  text-decoration: none; color: inherit;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
  overflow: hidden;
  background: var(--bg2);
  transition: border-color .25s, transform .25s, box-shadow .25s;
}
.kit-card:hover {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-soft);
}
.kit-card img {
  width: 100%; aspect-ratio: 16/9; object-fit: cover;
}
.kit-body { padding: 16px 18px 18px; }
.kit-card h3 { margin: 0 0 4px; font-size: 16px; font-weight: 600; }
.kit-card .kit-tag {
  display: inline-block; margin-bottom: 8px;
  font-size: 11px; font-weight: 500; letter-spacing: .1em;
  text-transform: uppercase; color: var(--mute);
}
.kit-card .kit-desc { margin: 0 0 10px; color: var(--mute); font-size: 14px; line-height: 1.45; }
.kit-card .kit-price { font-size: 14px; font-weight: 600; color: var(--ink); }
.kit-empty { color: var(--mute); font-size: 15px; padding: 32px 0; }

/* --- About --- */
.about {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 40px;
  align-items: start;
  padding: 48px 0 40px;
}
.about-photo {
  width: 200px; height: 200px;
  border-radius: 50%; object-fit: cover;
  border: 2px solid var(--glass-border);
  box-shadow: var(--shadow-soft);
}
.about-body { max-width: 560px; }
.about-body p { margin: 0 0 18px; color: var(--mute); font-size: 17px; line-height: 1.6; }
.about-body p strong { color: var(--ink); font-weight: 600; }
.about-stats {
  display: flex; gap: 40px; margin-top: 28px;
  padding-top: 24px; border-top: 1px solid var(--line);
}
.about-stat .num {
  font-size: 28px; font-weight: 500; letter-spacing: -.03em;
  font-variant-numeric: tabular-nums;
}
.about-stat .lbl { font-size: 13px; color: var(--mute); margin-top: 2px; }

/* --- Login --- */
.login-page { min-height: calc(100vh - var(--nav-h)); display: flex; align-items: center; justify-content: center; padding: 48px 18px; }
.login-card {
  width: min(440px, 100%);
  padding: 36px 34px;
}
.login-card h1 { font-size: 30px; margin-bottom: 8px; }
.login-card .lead { margin-bottom: 28px; font-size: 15px; }
.login-form { display: grid; gap: 16px; }
.login-form input {
  min-height: 48px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--bg2);
  color: var(--ink); padding: 0 16px; transition: border-color .2s;
}
.login-form input:focus { outline: none; border-color: var(--cyan); }
.login-form input::placeholder { color: var(--mute); }
.login-divider { height: 1px; background: var(--line); margin: 24px 0; }
.login-note { font-size: 13px; color: var(--mute); margin: 0; text-align: center; }
.login-success { text-align: center; }
.login-success h2 { margin-bottom: 12px; }
.login-success .lead { margin: 0 auto 20px; }
.login-success-email { color: var(--ink); font-weight: 600; }

/* --- Affiliates --- */
.aff-hero { padding: 48px 0 32px; max-width: 680px; }
.aff-math {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  margin: 24px 0 0;
}
.aff-math-num {
  font-size: clamp(40px, 6vw, 56px); font-weight: 500; letter-spacing: -.04em;
  font-variant-numeric: tabular-nums;
}
.aff-math-label { color: var(--mute); font-size: 16px; }
.aff-terms {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px;
  margin: 32px 0;
}
.aff-term {
  padding: 22px 24px;
}
.aff-term .num { font-size: 26px; font-weight: 500; letter-spacing: -.03em; font-variant-numeric: tabular-nums; }
.aff-term .lbl { color: var(--mute); font-size: 13px; margin-top: 4px; }
.aff-copy { margin: 16px 0 32px; display: grid; gap: 14px; }
.aff-copy-item {
  display: flex; gap: 10px; align-items: stretch;
}
.aff-copy-item input {
  flex: 1; min-width: 0;
  min-height: 42px; border-radius: var(--radius-xs);
  border: 1px solid var(--line); background: var(--bg2);
  color: var(--mute); padding: 0 12px;
  font-size: 12px; font-variant-numeric: tabular-nums;
}
.aff-copy-item input:focus { outline: none; border-color: var(--cyan); }
.aff-copy-label { font-size: 13px; color: var(--mute); margin-bottom: 6px; }
.aff-copy-btn.copied { color: var(--cyan); border-color: var(--cyan); }

/* --- Footer --- */
.footer {
  position: relative; z-index: 1;
  border-top: 1px solid var(--line);
  padding: 28px 0;
  margin-top: 40px;
}
.footer-inner {
  width: min(var(--max), calc(100% - 36px));
  margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  flex-wrap: wrap;
  font-size: 13px; color: var(--mute);
}
.footer-brand { display: flex; align-items: center; gap: 8px; font-weight: 500; color: var(--ink); }
.footer-brand img { width: 18px; height: auto; }

/* --- Gate (password) --- */
.gate-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; }
.gate-card {
  width: min(420px, 100%);
  padding: 36px 32px;
  text-align: center;
}
.gate-logo { width: 36px; height: auto; margin: 0 auto 18px; }
.gate-card h1 { font-size: 30px; margin-bottom: 8px; }
.gate-card .lead { margin-bottom: 28px; font-size: 15px; margin-left: auto; margin-right: auto; }
.gate-form { display: grid; gap: 14px; }
.gate-form input {
  min-height: 48px; border-radius: var(--radius-sm);
  border: 1px solid var(--line-strong); background: var(--bg2);
  color: var(--ink); padding: 0 16px; text-align: center;
  transition: border-color .2s;
}
.gate-form input:focus { outline: none; border-color: var(--cyan); }
.gate-form input::placeholder { color: var(--mute); }
.gate-err { color: var(--mute); font-size: 13px; margin: 0; min-height: 18px; }

/* --- Bottom nav (mobile only, injected by JS) --- */
.bottomnav { display: none; }

/* --- Responsive --- */
@media (max-width: 880px) {
  .hero { grid-template-columns: 1fr; gap: 28px; padding: 36px 0 20px; }
  .about { grid-template-columns: 1fr; gap: 24px; }
  .about-photo { width: 140px; height: 140px; }
  .aff-terms { grid-template-columns: 1fr; }
}
@media (max-width: 760px) {
  .topnav-links { display: none; }
  .topnav-actions .btn.primary { display: none; }
  .topnav-actions { gap: 8px; }
  .content { width: calc(100% - 24px); }
  .topnav-inner { width: calc(100% - 24px); }
  .controls { grid-template-columns: 1fr; }
  .kit-grid { grid-template-columns: 1fr; gap: 14px; }
  .section { padding: 40px 0; }
  .aff-strip { flex-direction: column; align-items: flex-start; gap: 14px; padding: 24px; }
  .footer-inner { flex-direction: column; gap: 8px; text-align: center; }
  body { padding-bottom: 64px; }
  .bottomnav {
    display: flex; position: fixed; bottom: 0; left: 0; right: 0; z-index: 100;
    -webkit-backdrop-filter: blur(36px) saturate(160%);
    backdrop-filter: blur(36px) saturate(160%);
    background: var(--glass-fill);
    border-top: 1px solid var(--line);
    padding-bottom: env(safe-area-inset-bottom);
  }
  .bottomnav-item {
    flex: 1; display: flex; flex-direction: column; align-items: center; gap: 3px;
    padding: 10px 4px 8px;
    text-decoration: none; color: var(--mute); font-size: 10px; font-weight: 500;
    transition: color .2s;
  }
  .bottomnav-item[aria-current="page"] { color: var(--ink); }
  .bottomnav-item svg { width: 19px; height: 19px; }
}
@media (max-width: 480px) {
  h1 { font-size: clamp(28px, 8vw, 38px); }
  .winbody { padding: 18px 18px 20px; }
  .sheet-keep-val { font-size: 34px; }
  .login-card, .gate-card { padding: 28px 22px; }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .01ms !important;
    transition-duration: .01ms !important;
  }
}