/* =========================================================
   Haoyun Studio — premium editorial system
   Tokens → base → layout → components → pages → responsive
   ========================================================= */

:root {
  --ink: #14181c;
  --ink-soft: #39414a;
  --muted: #6b727b;
  --line: rgba(20, 24, 28, 0.12);
  --line-soft: rgba(20, 24, 28, 0.07);
  --paper: #fbfbf9;
  --paper-alt: #f2f3ef;
  --surface: #ffffff;
  --accent: #178a52;
  --accent-ink: #0f6b3f;
  --accent-tint: rgba(23, 138, 82, 0.08);
  --accent-soft: #1bbf66;

  --font-display: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  --font-body: "SF Pro Text", -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;

  --container: 1180px;
  --gutter: clamp(1.25rem, 5vw, 3rem);
  --section-y: clamp(4.5rem, 9vw, 8.5rem);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --dur: 0.7s;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.62;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

body.menu-open { overflow: hidden; }

::selection { background: var(--accent-tint); color: var(--accent-ink); }

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.022em;
  line-height: 1.06;
  margin: 0;
  color: var(--ink);
}

p { margin: 0; }

/* ---------- layout utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section { padding: var(--section-y) 0; }
.section--tight { padding: clamp(3rem, 6vw, 5rem) 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 1.4rem;
}
.eyebrow::before {
  content: "";
  width: 1.7rem;
  height: 1px;
  background: var(--accent);
}
.eyebrow--center { justify-content: center; }

.lede {
  font-size: clamp(1.06rem, 1.6vw, 1.3rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 42ch;
}

.display {
  font-size: clamp(2.6rem, 6vw, 5rem);
  letter-spacing: -0.03em;
  line-height: 1.02;
}

.h2 { font-size: clamp(2rem, 4.2vw, 3.2rem); }

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--accent-ink);
  font-weight: 550;
  font-size: 0.98rem;
  width: fit-content;
}
.text-link::after {
  content: "\2192";
  transition: transform 0.35s var(--ease);
}
.text-link:hover::after { transform: translateX(4px); }

.muted { color: var(--muted); }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.92rem 1.6rem;
  font-family: var(--font-body);
  font-size: 0.96rem;
  font-weight: 550;
  letter-spacing: 0.005em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease), border-color 0.3s var(--ease), color 0.3s var(--ease);
}
.btn--primary { background: var(--ink); color: var(--paper); }
.btn--primary:hover { background: #000; transform: translateY(-1px); }
.btn--line { border-color: rgba(20, 24, 28, 0.22); color: var(--ink); }
.btn--line:hover { border-color: var(--ink); background: var(--ink); color: var(--paper); }

/* App Store download */
.btn--store {
  background: var(--ink);
  color: var(--paper);
  padding: 0.7rem 1.4rem 0.72rem 1.2rem;
  gap: 0.7rem;
}
.btn--store:hover { background: #000; transform: translateY(-1px); }
.btn--store svg { width: 22px; height: 22px; fill: currentColor; flex: none; }
.store-label { display: flex; flex-direction: column; line-height: 1.05; text-align: left; }
.store-label span:first-child { font-size: 0.62rem; opacity: 0.78; letter-spacing: 0.04em; }
.store-label span:last-child { font-size: 1.02rem; font-weight: 550; letter-spacing: -0.01em; }

.btn-row { display: flex; flex-wrap: wrap; gap: 0.9rem; align-items: center; }

/* ---------- reveal ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.reveal.is-visible { opacity: 1; transform: none; }
.d1 { transition-delay: 0.07s; }
.d2 { transition-delay: 0.14s; }
.d3 { transition-delay: 0.21s; }
.d4 { transition-delay: 0.28s; }

/* ---------- header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  transition: background 0.4s var(--ease), border-color 0.4s var(--ease), backdrop-filter 0.4s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.is-scrolled {
  background: rgba(251, 251, 249, 0.82);
  backdrop-filter: saturate(1.2) blur(14px);
  -webkit-backdrop-filter: saturate(1.2) blur(14px);
  border-bottom-color: var(--line);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--gutter);
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}
.brand-link {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.04rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.brand-mark { width: 26px; height: 26px; flex: none; }
.header-nav { display: flex; align-items: center; gap: 2rem; }
.header-nav a {
  font-size: 0.92rem;
  color: var(--ink-soft);
  position: relative;
  padding: 0.3rem 0;
  transition: color 0.3s var(--ease);
}
.header-nav a:hover { color: var(--ink); }
.header-nav a.is-active { color: var(--ink); }
.header-nav a.is-active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1.5px;
  background: var(--accent);
}
.header-actions { display: flex; align-items: center; gap: 0.9rem; }
.lang-switch {
  font-size: 0.82rem;
  font-weight: 550;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  transition: border-color 0.3s var(--ease), color 0.3s var(--ease);
}
.lang-switch:hover { border-color: var(--ink); color: var(--ink); }
.header-store {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.9rem;
  font-weight: 550;
  color: var(--paper);
  background: var(--ink);
  border-radius: 999px;
  padding: 0.52rem 1.1rem;
  transition: background 0.3s var(--ease), transform 0.3s var(--ease);
}
.header-store:hover { background: #000; transform: translateY(-1px); }
.header-store svg { width: 15px; height: 15px; fill: currentColor; }

.menu-toggle {
  display: none;
  width: 42px; height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
  cursor: pointer;
  position: relative;
}
.menu-toggle span {
  position: absolute;
  left: 12px; right: 12px;
  height: 1.5px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.menu-toggle span:nth-child(1) { top: 16px; }
.menu-toggle span:nth-child(2) { top: 21px; }
.menu-toggle span:nth-child(3) { top: 26px; }
.menu-toggle.is-open span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

.mobile-nav {
  position: fixed;
  inset: 74px 0 0 0;
  z-index: 99;
  background: var(--paper);
  padding: 2rem var(--gutter) 3rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  transform: translateY(-12px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}
.mobile-nav.is-open { opacity: 1; transform: none; pointer-events: auto; }
.mobile-nav a {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  padding: 0.7rem 0;
  border-bottom: 1px solid var(--line-soft);
}
.mobile-nav a:last-child { border-bottom: none; }

/* ---------- footer ---------- */
.site-footer {
  background: var(--ink);
  color: rgba(251, 251, 249, 0.72);
}
.site-footer .container { padding-top: clamp(3.5rem, 6vw, 5.5rem); padding-bottom: 2.4rem; }
.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1fr;
  gap: 2.5rem;
}
.footer-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--paper);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.08rem;
}
.footer-brand .brand-mark { color: var(--paper); }
.footer-note { margin-top: 1.1rem; max-width: 32ch; font-size: 0.95rem; line-height: 1.6; }
.footer-col h3 {
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(251, 251, 249, 0.5);
  margin-bottom: 1.1rem;
}
.footer-col a {
  display: block;
  font-size: 0.95rem;
  padding: 0.32rem 0;
  color: rgba(251, 251, 249, 0.72);
  transition: color 0.3s var(--ease);
}
.footer-col a:hover { color: var(--paper); }
.footer-bottom {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  padding-top: 1.6rem;
  border-top: 1px solid rgba(251, 251, 249, 0.12);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.6rem;
  font-size: 0.84rem;
  color: rgba(251, 251, 249, 0.5);
}

/* ---------- home hero ---------- */
.hero {
  position: relative;
  padding-top: clamp(8.5rem, 16vh, 12rem);
  padding-bottom: clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  top: -20%; right: -10%;
  width: 60vw; height: 60vw;
  max-width: 760px; max-height: 760px;
  background: radial-gradient(circle, var(--accent-tint), transparent 62%);
  z-index: 0;
  pointer-events: none;
}
.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero h1 {
  font-size: clamp(2.7rem, 5.6vw, 4.7rem);
  letter-spacing: -0.032em;
  line-height: 1.02;
}
.hero h1 em { font-style: normal; color: var(--accent-ink); }
.hero-lede { margin: 1.6rem 0 2.2rem; max-width: 46ch; }
.hero-actions { margin-bottom: 0; }

.meta-row {
  position: relative;
  z-index: 1;
  margin-top: clamp(3rem, 6vw, 5rem);
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.5rem, 4vw, 3.5rem);
}
.meta-row > div { display: flex; flex-direction: column; gap: 0.25rem; }
.meta-row dt, .meta-row .meta-k {
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}
.meta-row dd, .meta-row .meta-v {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

/* ---------- device mockup + generic chat UI ---------- */
.device {
  width: min(300px, 72vw);
  aspect-ratio: 9 / 19.2;
  margin: 0 auto;
  background: #0c0e12;
  border-radius: 46px;
  padding: 9px;
  box-shadow: 0 44px 90px -34px rgba(20, 24, 28, 0.45), 0 0 0 1px rgba(20, 24, 28, 0.06);
  position: relative;
}
.device::before {
  content: "";
  position: absolute;
  top: 16px; left: 50%;
  transform: translateX(-50%);
  width: 88px; height: 24px;
  background: #0c0e12;
  border-radius: 999px;
  z-index: 3;
}
.device__screen {
  height: 100%;
  border-radius: 38px;
  overflow: hidden;
  background: linear-gradient(180deg, #f7f8f6, #eef0ec);
  position: relative;
}
.ui { height: 100%; display: flex; flex-direction: column; padding: 1.4rem 0.95rem 0.95rem; font-size: 12px; }
.ui__bar { display: flex; justify-content: space-between; align-items: center; font-weight: 600; color: var(--ink); padding: 0 0.3rem 0.6rem; }
.ui__dots { display: inline-flex; gap: 3px; }
.ui__dots i { width: 4px; height: 4px; border-radius: 50%; background: var(--ink); opacity: 0.5; }
.ui__head { display: flex; align-items: center; justify-content: space-between; padding: 0.3rem 0.3rem 0.7rem; }
.ui__title { font-family: var(--font-display); font-weight: 600; font-size: 1.35rem; letter-spacing: -0.02em; }
.ui__sync { display: inline-flex; align-items: center; gap: 5px; font-size: 10.5px; font-weight: 600; color: var(--accent-ink); background: var(--accent-tint); border-radius: 999px; padding: 4px 9px; }
.ui__sync .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2.4s var(--ease) infinite; }
.ui__accounts { position: relative; display: flex; gap: 8px; padding: 0.2rem 0.3rem 0.9rem; }
.acct { flex: 1; display: inline-flex; align-items: center; gap: 7px; font-size: 11px; font-weight: 600; color: var(--ink-soft); background: rgba(255,255,255,0.7); border: 1px solid var(--line-soft); border-radius: 12px; padding: 8px 9px; }
.acct.is-active { color: var(--ink); border-color: rgba(23,138,82,0.4); background: #fff; box-shadow: 0 6px 18px -12px rgba(20,24,28,0.4); }
.acct__ava { width: 22px; height: 22px; border-radius: 50%; display: grid; place-items: center; color: #fff; font-size: 11px; }
.acct__ava--a { background: linear-gradient(140deg, #2b6b4a, #178a52); }
.acct__ava--b { background: linear-gradient(140deg, #3a414a, #6b727b); }
.sync-pulse {
  position: absolute;
  left: 28%; right: 28%; top: 50%;
  height: 1.5px;
  background: linear-gradient(90deg, transparent, rgba(23,138,82,0.5), transparent);
}
.sync-pulse::after {
  content: "";
  position: absolute;
  top: -2.5px; left: 0;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px rgba(23,138,82,0.18);
  animation: travel 3s var(--ease) infinite;
}
.ui__list { list-style: none; margin: 0; padding: 0; flex: 1; display: flex; flex-direction: column; gap: 2px; overflow: hidden; }
.ui__list li { display: flex; align-items: center; gap: 9px; padding: 8px 7px; border-radius: 12px; background: rgba(255,255,255,0.55); }
.ui__list li:nth-child(1) { background: #fff; }
.row__ava { width: 32px; height: 32px; border-radius: 50%; flex: none; display: grid; place-items: center; color: #fff; font-size: 12px; font-weight: 600; background: linear-gradient(140deg, #3a414a, #6b727b); }
.ui__list li:nth-child(2n) .row__ava { background: linear-gradient(140deg, #2b6b4a, #178a52); }
.ui__list li > div { flex: 1; min-width: 0; }
.ui__list strong { display: block; font-size: 12px; color: var(--ink); }
.ui__list span { display: block; font-size: 10.5px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ui__list time { font-size: 9.5px; color: var(--muted); flex: none; }
.ui__list .unread { width: 16px; height: 16px; border-radius: 50%; background: var(--accent); color: #fff; font-size: 9px; display: grid; place-items: center; flex: none; }

@keyframes pulse { 0%, 100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.5); opacity: 0.55; } }
@keyframes travel { 0% { left: 0; } 50% { left: calc(100% - 6px); } 100% { left: 0; } }

/* ---------- numbered flow (how it works teaser) ---------- */
.flow { display: grid; grid-template-columns: repeat(3, 1fr); gap: clamp(1.5rem, 3vw, 2.5rem); margin-top: 3rem; }
.flow-step { padding-top: 1.4rem; border-top: 1.5px solid var(--ink); }
.flow-step .n { font-family: var(--font-display); font-size: 0.8rem; font-weight: 600; letter-spacing: 0.1em; color: var(--accent-ink); }
.flow-step h3 { font-size: 1.3rem; margin: 0.9rem 0 0.6rem; }
.flow-step p { color: var(--ink-soft); font-size: 0.97rem; }

/* ---------- two-column section heading ---------- */
.section-split { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: clamp(2rem, 5vw, 4rem); align-items: start; }
.section-split p { color: var(--ink-soft); }

/* ---------- principle rows ---------- */
.principles { margin-top: clamp(2.5rem, 5vw, 4rem); border-top: 1px solid var(--line); }
.principle {
  display: grid;
  grid-template-columns: 5rem 1fr 1.3fr;
  gap: clamp(1rem, 3vw, 2.5rem);
  align-items: baseline;
  padding: clamp(1.6rem, 3vw, 2.4rem) 0;
  border-bottom: 1px solid var(--line);
}
.principle .n { font-family: var(--font-display); font-size: 1rem; color: var(--muted); }
.principle h3 { font-size: clamp(1.2rem, 2vw, 1.55rem); }
.principle p { color: var(--ink-soft); font-size: 0.99rem; }

/* ---------- ink statement band ---------- */
.band-ink { background: var(--ink); color: var(--paper); }
.band-ink .container { padding-top: var(--section-y); padding-bottom: var(--section-y); }
.band-ink .eyebrow { color: rgba(251,251,249,0.6); }
.band-ink .eyebrow::before { background: var(--accent-soft); }
.band-statement {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 4vw, 3rem);
  letter-spacing: -0.025em;
  line-height: 1.1;
  max-width: 20ch;
}
.band-statement em { font-style: normal; color: var(--accent-soft); }
.assurance {
  margin-top: clamp(2.5rem, 5vw, 4rem);
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid rgba(251,251,249,0.16);
}
.assurance > div { padding: 1.8rem 1.6rem 0 0; border-right: 1px solid rgba(251,251,249,0.12); }
.assurance > div:last-child { border-right: none; padding-right: 0; }
.assurance h4 { color: var(--paper); font-size: 1.05rem; margin-bottom: 0.5rem; }
.assurance p { color: rgba(251,251,249,0.62); font-size: 0.93rem; }

/* ---------- inner hero (secondary pages) ---------- */
.inner-hero {
  padding-top: clamp(8rem, 15vh, 11.5rem);
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
  border-bottom: 1px solid var(--line);
}
.inner-hero__grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: clamp(1.5rem, 4vw, 3.5rem); align-items: end; }
.inner-hero h1 { font-size: clamp(2.4rem, 5vw, 4rem); letter-spacing: -0.03em; }
.inner-hero p { color: var(--ink-soft); font-size: 1.05rem; line-height: 1.6; }

/* app badge (real icon — single evidence card) */
.app-badge {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.3rem 1rem 1rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--surface);
  width: fit-content;
  box-shadow: 0 24px 60px -38px rgba(20, 24, 28, 0.5);
}
.app-badge img { width: 72px; height: 72px; border-radius: 22%; flex: none; }
.app-badge strong { display: block; font-family: var(--font-display); font-weight: 600; font-size: 1.12rem; letter-spacing: -0.01em; }
.app-badge span { color: var(--muted); font-size: 0.86rem; }

/* live pill */
.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--accent-tint);
  color: var(--accent-ink);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.42rem 0.9rem;
  border-radius: 999px;
}
.live-pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }

/* real screenshot gallery */
.shots {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: clamp(0.8rem, 1.8vw, 1.4rem);
  margin-top: clamp(2.4rem, 5vw, 3.6rem);
}
.shots.cols-3 { grid-template-columns: repeat(3, 1fr); max-width: 860px; }
.shots img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 22px;
  border: 1px solid var(--line);
  box-shadow: 0 32px 64px -44px rgba(20, 24, 28, 0.5);
  background: var(--surface);
}
.app-line {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.2rem 2rem;
  margin-top: clamp(2.4rem, 5vw, 3.4rem);
  padding-top: 1.8rem;
  border-top: 1px solid var(--line);
}
@media (max-width: 860px) {
  .shots {
    grid-auto-flow: column;
    grid-template-columns: none;
    grid-auto-columns: 64%;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    margin-left: calc(-1 * var(--gutter));
    margin-right: calc(-1 * var(--gutter));
    padding: 0 var(--gutter) 0.6rem;
  }
  .shots img { scroll-snap-align: center; }
}

/* ---------- feature rows (product page) ---------- */
.feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 6vw, 5rem);
  align-items: center;
  padding: clamp(3rem, 6vw, 5.5rem) 0;
  border-bottom: 1px solid var(--line);
}
.feature-row:nth-child(even) .feature-media { order: -1; }
.feature-copy .n { font-family: var(--font-display); font-weight: 600; color: var(--accent-ink); font-size: 0.85rem; letter-spacing: 0.08em; }
.feature-copy h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); margin: 0.8rem 0 1rem; }
.feature-copy p { color: var(--ink-soft); max-width: 46ch; }
.feature-list { list-style: none; margin: 1.4rem 0 0; padding: 0; display: flex; flex-direction: column; gap: 0.7rem; }
.feature-list li { display: flex; gap: 0.65rem; align-items: flex-start; font-size: 0.96rem; color: var(--ink-soft); }
.feature-list li::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); margin-top: 0.55rem; flex: none; }

/* feature visual panel (no device) */
.feature-visual {
  position: relative;
  border-radius: 18px;
  background: var(--paper-alt);
  border: 1px solid var(--line);
  aspect-ratio: 5 / 4;
  display: grid;
  place-items: center;
  padding: 2rem;
  overflow: hidden;
}
.feature-visual .glyph { width: clamp(64px, 12vw, 104px); height: auto; color: var(--accent-ink); opacity: 0.9; }
.feature-visual .tag { position: absolute; left: 1.4rem; bottom: 1.2rem; font-size: 0.78rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted); }

/* ---------- step flow (detailed, product) ---------- */
.steps { counter-reset: step; margin-top: clamp(2.5rem, 5vw, 4rem); }
.step {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: clamp(1rem, 3vw, 2rem);
  padding: clamp(1.6rem, 3vw, 2.2rem) 0;
  border-top: 1px solid var(--line);
  align-items: start;
}
.step:last-child { border-bottom: 1px solid var(--line); }
.step .num {
  width: 2.6rem; height: 2.6rem;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  display: grid; place-items: center;
  font-family: var(--font-display);
  font-weight: 600;
}
.step h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); margin-bottom: 0.5rem; }
.step p { color: var(--ink-soft); max-width: 60ch; }

/* ---------- spec table ---------- */
.spec { border-top: 1px solid var(--ink); margin-top: 1.5rem; }
.spec > div {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 1rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}
.spec dt, .spec .k { color: var(--muted); font-size: 0.82rem; letter-spacing: 0.1em; text-transform: uppercase; }
.spec dd, .spec .v { margin: 0; font-family: var(--font-display); font-weight: 600; letter-spacing: -0.01em; }

/* ---------- capabilities (sticky index + phases) ---------- */
.caps-layout { display: grid; grid-template-columns: 0.42fr 1fr; gap: clamp(2rem, 5vw, 5rem); align-items: start; }
.caps-index { position: sticky; top: 110px; display: flex; flex-direction: column; gap: 0.2rem; }
.caps-index a {
  display: flex; gap: 0.8rem; align-items: baseline;
  padding: 0.6rem 0;
  color: var(--muted);
  border-bottom: 1px solid var(--line-soft);
  transition: color 0.3s var(--ease);
}
.caps-index a .n { font-size: 0.8rem; font-family: var(--font-display); }
.caps-index a strong { font-family: var(--font-display); font-weight: 600; font-size: 1.02rem; letter-spacing: -0.01em; }
.caps-index a.is-current { color: var(--ink); }
.caps-index a.is-current .n { color: var(--accent-ink); }
.phase { padding: 0 0 clamp(2.5rem, 5vw, 4rem); }
.phase + .phase { padding-top: clamp(2rem, 4vw, 3rem); border-top: 1px solid var(--line); }
.phase .n { font-family: var(--font-display); font-weight: 600; color: var(--accent-ink); letter-spacing: 0.06em; }
.phase h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); margin: 0.7rem 0 1rem; }
.phase p { color: var(--ink-soft); max-width: 60ch; }
.phase .feature-list { margin-top: 1.2rem; }

/* ---------- about ---------- */
.about-split { display: grid; grid-template-columns: 1fr 1.1fr; gap: clamp(2rem, 5vw, 4.5rem); align-items: start; }
.about-split h1 { font-size: clamp(2.4rem, 5vw, 3.8rem); letter-spacing: -0.03em; }
.about-lede { font-size: clamp(1.2rem, 2vw, 1.5rem); line-height: 1.45; color: var(--ink); font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; }
.about-body p { color: var(--ink-soft); margin-bottom: 1.1rem; max-width: 58ch; }
.values { border-top: 1px solid var(--ink); margin-top: 1rem; }
.values > div { padding: 1.5rem 0; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 9rem 1fr; gap: clamp(1rem, 3vw, 2rem); }
.values dt { font-family: var(--font-display); font-weight: 600; font-size: 1.05rem; }
.values dd { margin: 0; color: var(--ink-soft); }
.facts { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem 2.5rem; margin-top: 2rem; }
.facts > div { display: flex; flex-direction: column; gap: 0.3rem; }
.facts .k { font-size: 0.7rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.facts .v { font-family: var(--font-display); font-weight: 600; font-size: 1.1rem; }

/* ---------- contact ---------- */
.lanes { border-top: 1px solid var(--ink); margin-top: 1rem; }
.lane {
  display: grid;
  grid-template-columns: 8rem 1fr auto;
  gap: clamp(1rem, 3vw, 2rem);
  align-items: center;
  padding: clamp(1.4rem, 3vw, 2rem) 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.35s var(--ease);
}
.lane:hover { padding-left: 0.6rem; }
.lane .k { font-size: 0.72rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); }
.lane .v { display: block; font-family: var(--font-display); font-weight: 600; font-size: clamp(1.1rem, 2vw, 1.45rem); letter-spacing: -0.01em; }
.lane .desc { display: block; color: var(--muted); font-size: 0.9rem; margin-top: 0.3rem; }
.lane .arrow { color: var(--accent-ink); font-size: 1.1rem; transition: transform 0.35s var(--ease); }
.lane:hover .arrow { transform: translateX(5px); }

/* ---------- legal ---------- */
.legal-body { max-width: 760px; }
.legal-body h2 { font-size: clamp(1.3rem, 2.4vw, 1.7rem); margin: 2.6rem 0 0.9rem; }
.legal-body h2:first-child { margin-top: 0; }
.legal-body p, .legal-body li { color: var(--ink-soft); line-height: 1.72; }
.legal-body p { margin-bottom: 1rem; }
.legal-body ul { margin: 0 0 1rem; padding-left: 1.1rem; }
.legal-body li { margin-bottom: 0.5rem; }
.legal-meta { color: var(--muted); font-size: 0.88rem; margin-bottom: 2.4rem; }
.legal-body a { color: var(--accent-ink); text-decoration: underline; text-underline-offset: 2px; }

/* ---------- closing CTA ---------- */
.cta-final { text-align: center; }
.cta-final .container { display: flex; flex-direction: column; align-items: center; gap: 1.6rem; }
.cta-final h2 { font-size: clamp(2.1rem, 4.5vw, 3.4rem); letter-spacing: -0.03em; max-width: 18ch; }
.cta-final p { color: var(--ink-soft); max-width: 44ch; }
.cta-note { font-size: 0.86rem; color: var(--muted); }

/* ---------- 404 ---------- */
.page-404 main { min-height: 70vh; display: grid; place-items: center; text-align: center; padding: 8rem var(--gutter) 4rem; }
.page-404 .code { font-family: var(--font-display); font-weight: 600; font-size: clamp(4rem, 14vw, 9rem); letter-spacing: -0.04em; line-height: 1; }
.page-404 h1 { font-size: clamp(1.5rem, 3vw, 2.2rem); margin: 1rem 0; }
.page-404 p { color: var(--ink-soft); margin-bottom: 2rem; }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .header-nav, .header-store { display: none; }
  .menu-toggle { display: block; }
  .hero-grid { grid-template-columns: 1fr; }
  .hero-media { margin-top: 1.5rem; }
  .section-split, .inner-hero__grid, .about-split, .caps-layout { grid-template-columns: 1fr; gap: 1.6rem; }
  .caps-index { position: static; flex-direction: row; flex-wrap: wrap; gap: 0.6rem 1.2rem; margin-bottom: 1.5rem; }
  .caps-index a { border: none; padding: 0; }
  .feature-row { grid-template-columns: 1fr; gap: 1.8rem; }
  .feature-row:nth-child(even) .feature-media { order: 0; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .flow { grid-template-columns: 1fr; gap: 1.4rem; }
  .principle { grid-template-columns: 1fr; gap: 0.5rem; }
  .principle .n { color: var(--accent-ink); }
  .assurance { grid-template-columns: 1fr; }
  .assurance > div { border-right: none; border-bottom: 1px solid rgba(251,251,249,0.12); padding: 1.3rem 0; }
  .assurance > div:last-child { border-bottom: none; }
  .values > div, .lane { grid-template-columns: 1fr; gap: 0.4rem; }
  .lane .arrow { display: none; }
  .facts { grid-template-columns: 1fr; }
  .spec > div { grid-template-columns: 1fr; gap: 0.2rem; }
  .footer-grid { grid-template-columns: 1fr; }
  .step { grid-template-columns: 1fr; gap: 0.6rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .ui__sync .dot, .sync-pulse::after { animation: none; }
  * { transition-duration: 0.001ms !important; }
}