/* ============================================================
   NANORA — design system
   Paper-and-bead apothecary. Quiet, premium, clinical-warm.
   ============================================================ */

/* TOKENS V4 · LOCKED 2026-05-28 · Helvetica Neue system */

:root {
  /* neutrals — three hold the system. Never pure white, never pure black. */
  --paper:        #FDFDFC;  /* near-white — exact target surface */
  --bone:         #F1ECE3;  /* Bone — accent tint surface */
  --paper-deep:   #F4F0E8;  /* very soft linen — secondary surface */
  --ink:          #14141A;  /* Ink — wordmark & type */
  --ink-soft:     #2A2A32;  /* Ink soft — body text */
  --ink-faint:    #6B6B72;  /* Ink mute — captions */
  --line:         #D9D2C4;  /* Rule — hairlines */
  --white:        #FFFFFF;  /* clean card surface */

  /* per-formula accents — Okcheondang 14-colour natural colorant catalog */
  --sync:  #E8A88E;  /* 황도 Peach */
  --flow:  #A8C9B5;  /* 청록 Jade */
  --ease:  #EDD088;  /* 버터 Butter */
  --move:  #B8C99A;  /* 약초 Leaf */
  --core:  #D8CDB8;  /* 한지 Hanji */
  --calm:  #BFAFC8;  /* 자라 Mauve */
  --rise:  #E8AC7A;  /* 감 Persimmon */
  --tone:  #9DB0BC;  /* dusty blue — 8th, tuned to the soft finish */

  /* deep navy — warm-leaning, replaces pure black on dark sections */
  --navy:      #14213F;   /* deep Klein-leaning blue */
  --navy-soft: #1E2F55;

  /* soft section washes — barely-there tints from the product palette */
  --wash-flow: #EEF3EF;   /* jade-tinted */
  --wash-calm: #F1EEF4;   /* mauve-tinted */
  --wash-ease: #F5F1E6;   /* butter-tinted */
  --wash-rise: #F6EFE6;   /* persimmon-tinted */

  /* type — one family, three weights, one italic exception (V4 LOCKED) */
  --display: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  --serif:   'Helvetica Neue', Helvetica, Arial, sans-serif;
  --ui:      'Helvetica Neue', Helvetica, Arial, sans-serif;

  /* spacing scale */
  --s1: 0.5rem;  --s2: 1rem;   --s3: 1.5rem;  --s4: 2.5rem;
  --s5: 4rem;    --s6: 6rem;   --s7: 9rem;

  --maxw: 1180px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--ui);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--s4); }

/* ---------- wordmark ---------- */
.wordmark {
  font-family: var(--display);
  font-weight: 500;
  letter-spacing: -0.01em;
  font-size: 1.35rem;
}
.wordmark .deg { color: var(--ink-faint); }

.logo-img { height: 26px; width: auto; display: block; }
.footer .logo-img { height: 30px; filter: brightness(0) invert(1); }
/* ---------- nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,0.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}
.nav .wrap {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.nav-links { display: flex; gap: var(--s4); align-items: center; }
.nav-links a {
  font-size: 0.95rem; letter-spacing: 0;
  color: var(--ink-soft); transition: color .2s;
}
.nav-links a:hover { color: var(--ink); }
.nl { position: relative; transition: color .25s; }
.nl::after { content: ''; position: absolute; left: 0; bottom: -4px; height: 1.5px; width: 0; background: currentColor; transition: width .25s; }
.nl:hover::after { width: 100%; }
.nav-cta, .nav-links a.nav-cta {
  font-family: var(--ui); font-size: 0.88rem; letter-spacing: 0;
  border: 1px solid var(--ink);
  background: var(--ink); color: var(--paper);
  padding: 0.55rem 1.25rem; border-radius: 100px; transition: all .2s; font-weight: 500;
}
.nav-cta:hover, .nav-links a.nav-cta:hover { background: #000; border-color: #000; color: #fff; transform: translateY(-1px); box-shadow: 0 10px 22px -14px rgba(20,20,26,0.5); }

/* ---------- buttons ---------- */
.btn {
  display: inline-block; font-family: var(--ui); font-weight: 500;
  font-size: 0.95rem; letter-spacing: 0.01em;
  padding: 0.9rem 1.8rem; border-radius: 100px; cursor: pointer;
  transition: all .25s; border: 1px solid transparent;
}
.btn-dark { background: var(--ink); color: var(--paper); }
.btn-dark:hover { background: #000; transform: translateY(-1px); }
.btn-ghost { border-color: var(--ink); color: var(--ink); }
.btn-ghost:hover { background: var(--ink); color: var(--paper); }
/* warm primary — persimmon-toned, for the hero */
.btn-warm { background: var(--rise); color: var(--ink); }
.btn-warm:hover { background: #DD9A63; transform: translateY(-1px); box-shadow: 0 14px 28px -16px rgba(232,172,122,0.9); }
/* soft secondary — tinted outline that picks up jade */
.btn-soft { border-color: var(--flow); color: var(--ink-soft); background: rgba(168,201,181,0.14); }
.btn-soft:hover { background: var(--flow); color: var(--ink); transform: translateY(-1px); }

/* ---------- eyebrow / caption — UPPERCASE +0.18em ---------- */
.eyebrow {
  font-family: var(--ui); font-size: 0.72rem; font-weight: 500;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-faint);
}

/* ---------- type helpers — Display Medium 500, sentence case ---------- */
.display-xl { font-family: var(--display); font-weight: 500; line-height: 1.04;
  letter-spacing: -0.02em; font-size: clamp(2.6rem, 6.4vw, 4.8rem); }
.display-l  { font-family: var(--display); font-weight: 500; line-height: 1.08;
  letter-spacing: -0.018em; font-size: clamp(2rem, 4vw, 3.1rem); }
.display-m  { font-family: var(--display); font-weight: 500; line-height: 1.12;
  letter-spacing: -0.012em; font-size: clamp(1.5rem, 2.8vw, 2.2rem); }
.tagline { font-family: var(--serif); font-style: italic; font-weight: 400;
  color: var(--ink-soft); }
.lead { font-size: 1.12rem; line-height: 1.6; color: var(--ink-soft); max-width: 46ch; }

/* ---------- footer ---------- */
.footer {
  background: var(--navy); color: var(--paper-deep);
  padding: var(--s6) 0 var(--s4);
}
.footer .wrap { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: var(--s4); }
.footer .wordmark { color: var(--white); }
.footer h4 { font-family: var(--ui); font-size: 0.74rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: #9AA8BF; margin-bottom: var(--s2); }
.footer a { display: block; color: var(--paper-deep); opacity: 0.85;
  font-size: 0.92rem; margin-bottom: 0.5rem; transition: opacity .2s; }
.footer a:hover { opacity: 1; }
.footer .fine {
  grid-column: 1 / -1; margin-top: var(--s5); padding-top: var(--s3);
  border-top: 1px solid rgba(255,255,255,0.12);
  font-size: 0.78rem; color: #96A2B6; line-height: 1.6;
}

/* ---------- utility ---------- */
.center { text-align: center; }
.mt2 { margin-top: var(--s2); } .mt3 { margin-top: var(--s3); }
.mt4 { margin-top: var(--s4); } .mt5 { margin-top: var(--s5); }

/* reveal on scroll */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }
.no-js .reveal, html:not(.js) .reveal { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
  .reveal { opacity: 1; transform: none; }
  html { scroll-behavior: auto; }
}

/* ---------- mobile navigation ---------- */
.nav-burger { display: none; background: none; border: none; cursor: pointer;
  width: 40px; height: 40px; padding: 9px 8px; flex-direction: column;
  justify-content: space-between; margin-left: var(--s2); }
.nav-burger span { display: block; height: 1.5px; width: 100%; background: var(--ink);
  transition: transform .25s ease, opacity .2s ease; }
.nav.open .nav-burger span:nth-child(1) { transform: translateY(10px) rotate(45deg); }
.nav.open .nav-burger span:nth-child(2) { opacity: 0; }
.nav.open .nav-burger span:nth-child(3) { transform: translateY(-10px) rotate(-45deg); }

@media (max-width: 820px) {
  .nav-burger { display: flex; order: 2; }
  .nav .wrap { flex-wrap: wrap; }
  .nav-links {
    order: 3;
    display: none; flex-direction: column; align-items: flex-start;
    width: 100%; gap: 0; padding: var(--s2) 0 var(--s3);
    border-top: 1px solid var(--line); margin-top: 0;
  }
  .nav.open .nav-links { display: flex; }
  .nav-links a:not(.nav-cta) { display: block; padding: 0.85rem 0; font-size: 0.95rem; width: 100%; }
  .nav-links .nav-cta { margin-top: var(--s2); text-align: center; width: 100%; }
  .footer .wrap { grid-template-columns: 1fr 1fr; }
  .wrap { padding: 0 var(--s3); }
}