/* ============================================================
   vyvflo.com — brand v2 "flow gradient"
   ink #0A0A12 · iris #8A7CFF → mint #3FE0D0
   ============================================================ */

:root {
  --bg:          #0A0A12;
  --bg-raise:    #10101B;
  --accent-a:    #8A7CFF;
  --accent-b:    #3FE0D0;
  --grad:        linear-gradient(135deg, #8A7CFF, #3FE0D0);
  --grad-soft:   linear-gradient(135deg, rgba(138,124,255,.45), rgba(63,224,208,.45));
  --text:        #F4F4FA;
  --text-sub:    rgba(244,244,250,0.62);
  --text-dim:    rgba(244,244,250,0.38);
  --card-bg:     rgba(244,244,250,0.04);
  --card-border: rgba(244,244,250,0.09);
  --glow-a:      rgba(138,124,255,0.10);
  --glow-b:      rgba(63,224,208,0.07);
  --mono: "SF Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --wrap: 1120px;
  --nav-h: 64px;
}

/* 워드마크 전용 (로고 타이포 규칙: Space Grotesk Bold, -5%) */
@font-face {
  font-family: 'Space Grotesk';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url('/assets/fonts/space-grotesk/space-grotesk-latin-700-normal.woff2') format('woff2');
}

/* ---- reset-lite ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: "Pretendard Variable", Pretendard, -apple-system, BlinkMacSystemFont,
    "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", sans-serif;
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: -0.01em;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
::selection { background: rgba(138,124,255,.35); }

:focus-visible {
  outline: 2px solid var(--accent-b);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip {
  position: absolute; left: -9999px; top: 0;
  background: var(--bg-raise); color: var(--text);
  padding: 10px 18px; z-index: 100; border-radius: 0 0 8px 0;
}
.skip:focus { left: 0; }

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 24px; }

/* ---- type utilities ---- */
.mono {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 500;
}
.eyebrow { color: var(--text-dim); margin-bottom: 20px; }
.eyebrow b { color: transparent; background: var(--grad); -webkit-background-clip: text; background-clip: text; font-weight: 600; }

h1, h2, h3 { line-height: 1.28; letter-spacing: -0.035em; font-weight: 800; }
h2 { font-size: clamp(28px, 4.2vw, 44px); }
h3 { font-size: 21px; letter-spacing: -0.02em; }
.sub { color: var(--text-sub); }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---- buttons ---- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 700; font-size: 16px; letter-spacing: -0.01em;
  padding: 15px 28px; border-radius: 12px;
  background: var(--grad); color: #07070E;
  transition: transform .25s ease, box-shadow .25s ease, filter .25s ease;
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 10px 34px rgba(138,124,255,.35), 0 4px 18px rgba(63,224,208,.22); filter: brightness(1.05); }
.btn:active { transform: translateY(0); }
.btn-ghost {
  background: transparent; color: var(--text-sub);
  border: 1px solid var(--card-border); box-shadow: none;
}
.btn-ghost:hover { color: var(--text); border-color: rgba(244,244,250,.25); box-shadow: none; }

/* ---- nav ---- */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  height: var(--nav-h);
  transition: background .3s ease, border-color .3s ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(10,10,18,0.78);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: rgba(244,244,250,.06);
}
.nav-inner {
  max-width: var(--wrap); margin: 0 auto; padding: 0 24px;
  height: 100%; display: flex; align-items: center; justify-content: space-between;
}
.wordmark { font-family: 'Space Grotesk', Pretendard, sans-serif; font-weight: 700; font-size: 20px; letter-spacing: -0.05em; }
.wordmark span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a { color: var(--text-sub); font-size: 14.5px; font-weight: 500; transition: color .2s; }
.nav-links a:hover { color: var(--text); }
.nav-cta {
  font-size: 14px; font-weight: 700; padding: 9px 18px; border-radius: 9px;
  background: var(--grad); color: #07070E;
}
@media (max-width: 720px) { .nav-links a:not(.nav-cta) { display: none; } }

/* ---- hero ---- */
.hero {
  position: relative; min-height: 100svh;
  display: flex; align-items: center;
  overflow: hidden;
  background:
    radial-gradient(52% 44% at 68% 26%, var(--glow-a), transparent 70%),
    radial-gradient(40% 36% at 22% 72%, var(--glow-b), transparent 70%),
    var(--bg);
}
#hero-canvas {
  position: absolute; inset: 0; width: 100%; height: 100%;
  opacity: 0; transition: opacity 1.4s ease;
}
#hero-canvas.on { opacity: 1; }
.hero::after {
  content: ""; position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(100deg, rgba(10,10,18,.85) 10%, rgba(10,10,18,.4) 46%, transparent 72%);
}
.hero-inner { position: relative; z-index: 2; padding-top: var(--nav-h); }
.hero h1 {
  font-size: clamp(38px, 6.6vw, 74px);
  line-height: 1.16;
  letter-spacing: -0.045em;
  margin: 0 0 24px;
  max-width: 15em;
}
.hero .lede { font-size: clamp(17px, 1.6vw, 19.5px); max-width: 34em; margin-bottom: 40px; }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.hero-note { margin-top: 22px; color: var(--text-dim); }

.scroll-cue {
  position: absolute; bottom: 34px; left: 50%; transform: translateX(-50%);
  z-index: 2; width: 1px; height: 56px; overflow: hidden;
}
.scroll-cue::after {
  content: ""; position: absolute; left: 0; top: -100%;
  width: 1px; height: 100%;
  background: linear-gradient(180deg, transparent, var(--accent-b));
  animation: cue 2.2s ease-in-out infinite;
}
@keyframes cue { 0% { top: -100%; } 60% { top: 100%; } 100% { top: 100%; } }

/* ---- flow thread (signature) ---- */
.thread-seg {
  width: 1px; height: 110px; margin: 0 auto;
  background: linear-gradient(180deg, transparent, var(--accent-a), var(--accent-b), transparent);
  opacity: .55;
}

/* ---- section rhythm ---- */
section { position: relative; }
.section { padding: 130px 0; }
.section-head { margin-bottom: 56px; }
.section-head .sub { margin-top: 16px; max-width: 36em; }
@media (max-width: 720px) { .section { padding: 90px 0; } }

/* ---- statement (공감/선언) ---- */
.statement { text-align: center; padding: 40px 0 130px; }
.statement .q {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 600; color: var(--text-dim);
  letter-spacing: -0.03em; line-height: 1.4;
}
.statement .a {
  font-size: clamp(30px, 4.6vw, 52px);
  font-weight: 800; letter-spacing: -0.04em; line-height: 1.3;
  margin-top: 18px;
}
.statement .a em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---- cards / paths ---- */
.paths { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
@media (max-width: 820px) { .paths { grid-template-columns: 1fr; } }
.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 38px 34px;
  position: relative;
  transition: transform .35s ease, border-color .35s ease, background .35s ease;
  transform-style: preserve-3d;
}
.card:hover { transform: translateY(-4px) rotateX(1.2deg); border-color: rgba(138,124,255,.35); background: rgba(244,244,250,.055); }
.card .mono { color: var(--text-dim); }
.card h3 { margin: 14px 0 12px; font-size: 24px; }
.card p { color: var(--text-sub); font-size: 16px; }
.card .go {
  display: inline-block; margin-top: 26px; font-weight: 600; font-size: 15px;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
}
.card .go::after { content: " ↓"; }

/* ---- process (sticky scrub) ---- */
.process-track { height: 340vh; }
.process-stage {
  position: sticky; top: 0; min-height: 100svh;
  display: flex; align-items: center; overflow: hidden;
}
.process-grid {
  display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 64px; align-items: center; width: 100%;
}
.process-steps { position: relative; padding-left: 42px; }
.thread {
  position: absolute; left: 12px; top: 8px; bottom: 8px;
  width: 2px; height: calc(100% - 16px); overflow: visible;
}
.thread line {
  stroke: url(#threadGrad); stroke-width: 2;
  stroke-dasharray: 1; stroke-dashoffset: calc(1 - var(--p, 0));
}
.step { position: relative; padding: 26px 0; opacity: .32; transition: opacity .45s ease, transform .45s ease; transform: translateX(6px); }
.step.is-active { opacity: 1; transform: translateX(0); }
.step::before {
  content: ""; position: absolute; left: -33.5px; top: 38px;
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--bg); border: 2px solid var(--text-dim);
  transition: border-color .4s, box-shadow .4s;
}
.step.is-active::before { border-color: var(--accent-b); box-shadow: 0 0 14px rgba(63,224,208,.6); }
.step-no { color: var(--text-dim); }
.step.is-active .step-no { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.step h3 { margin: 6px 0 8px; font-size: 23px; }
.step p { color: var(--text-sub); font-size: 16px; max-width: 30em; }
.step .meta { margin-top: 12px; color: var(--text-dim); text-transform: none; letter-spacing: 0.04em; }
.process-tail { margin-top: 30px; color: var(--text-dim); font-size: 15px; }

@media (max-width: 900px) {
  .process-track { height: auto; }
  .process-stage { position: static; min-height: 0; display: block; padding: 90px 0; }
  .process-grid { grid-template-columns: 1fr; gap: 40px; }
  .step { opacity: 1; transform: none; }
  .thread line { stroke-dashoffset: 0; }
}

/* ---- proof ---- */
.proof-grid { display: grid; grid-template-columns: minmax(0, 7fr) minmax(0, 5fr); gap: 20px; }
@media (max-width: 820px) { .proof-grid { grid-template-columns: 1fr; } }
.proof-feature h3 { font-size: clamp(24px, 3vw, 32px); line-height: 1.35; letter-spacing: -0.03em; margin: 14px 0 14px; font-weight: 800; }
.proof-feature p { color: var(--text-sub); font-size: 16px; }
.stat-num {
  font-family: var(--mono); font-weight: 700;
  font-size: clamp(56px, 7vw, 84px); line-height: 1;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  letter-spacing: -0.04em;
}
.stat-label { margin-top: 14px; color: var(--text-sub); font-size: 15.5px; }
.ref-card { margin-top: 20px; display: flex; align-items: flex-start; gap: 18px; flex-wrap: wrap; }
.badge {
  font-family: var(--mono); font-size: 11px; letter-spacing: .12em; text-transform: uppercase;
  padding: 5px 10px; border-radius: 999px;
  border: 1px solid rgba(63,224,208,.4); color: var(--accent-b);
  white-space: nowrap; margin-top: 4px;
}
.ref-card h4 { font-size: 17px; font-weight: 700; letter-spacing: -0.02em; }
.ref-card p { color: var(--text-sub); font-size: 15px; margin-top: 4px; }

/* ---- offer (pricing) ---- */
.offer-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin-bottom: 20px; }
@media (max-width: 900px) { .offer-grid { grid-template-columns: 1fr; } }
.price-card h3 { margin-bottom: 6px; }
.price-card .mono { color: var(--text-dim); }
.price-table { width: 100%; border-collapse: collapse; margin-top: 22px; font-size: 15.5px; }
.price-table th {
  text-align: left; font-family: var(--mono); font-size: 11px; letter-spacing: .12em;
  text-transform: uppercase; font-weight: 500; color: var(--text-dim);
  padding: 0 0 12px;
}
.price-table td { padding: 13px 0; border-top: 1px solid rgba(244,244,250,.07); vertical-align: top; }
.price-table td:last-child { text-align: right; font-family: var(--mono); font-size: 14px; letter-spacing: 0; color: var(--text); white-space: nowrap; }
.price-table .d { display: block; color: var(--text-dim); font-size: 13.5px; margin-top: 2px; }
.vat-note { color: var(--text-dim); font-size: 13.5px; margin-top: 14px; }

.terms { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
@media (max-width: 820px) { .terms { grid-template-columns: 1fr; } }
.term { padding: 26px 28px; }
.term .mono { color: var(--text-dim); }
.term p { margin-top: 10px; font-size: 15.5px; color: var(--text-sub); }
.term strong { color: var(--text); font-weight: 700; }
.early-note { margin-top: 26px; color: var(--text-dim); font-size: 14.5px; }
.early-note a { color: var(--text-sub); text-decoration: underline; text-underline-offset: 3px; }

/* ---- about ---- */
.about-grid { display: grid; grid-template-columns: minmax(0, 4fr) minmax(0, 7fr); gap: 56px; align-items: center; }
@media (max-width: 820px) { .about-grid { grid-template-columns: 1fr; gap: 36px; } }
.portrait {
  aspect-ratio: 4 / 5; border-radius: 20px; overflow: hidden; position: relative;
  background:
    radial-gradient(70% 55% at 50% 38%, rgba(138,124,255,.28), transparent 70%),
    radial-gradient(60% 45% at 55% 75%, rgba(63,224,208,.18), transparent 70%),
    var(--bg-raise);
  border: 1px solid var(--card-border);
  display: flex; align-items: center; justify-content: center;
}
.portrait img { width: 100%; height: 100%; object-fit: cover; }
.portrait-ph { text-align: center; }
.portrait-ph .initial {
  font-family: 'Space Grotesk', Pretendard, sans-serif;
  font-size: 84px; font-weight: 700; letter-spacing: -0.05em;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  line-height: 1;
}
.portrait-ph .mono { display: block; margin-top: 18px; color: var(--text-dim); }
.about-body h2 { margin-bottom: 8px; }
.about-role { color: var(--text-dim); margin-bottom: 22px; }
.about-body > p { color: var(--text-sub); max-width: 34em; }
.sign { margin-top: 26px; color: var(--text-dim); }
.sns { display: flex; gap: 22px; margin-top: 30px; flex-wrap: wrap; }
.sns a {
  font-family: var(--mono); font-size: 12.5px; letter-spacing: .1em; text-transform: uppercase;
  color: var(--text-sub); border-bottom: 1px solid rgba(244,244,250,.18);
  padding-bottom: 3px; transition: color .2s, border-color .2s;
}
.sns a:hover { color: var(--accent-b); border-color: var(--accent-b); }

/* ---- faq ---- */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-top: 1px solid rgba(244,244,250,.09); }
.faq details:last-child { border-bottom: 1px solid rgba(244,244,250,.09); }
.faq summary {
  cursor: pointer; list-style: none;
  padding: 24px 44px 24px 4px; position: relative;
  font-weight: 700; font-size: 17.5px; letter-spacing: -0.02em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+"; position: absolute; right: 10px; top: 50%;
  transform: translateY(-50%);
  font-family: var(--mono); font-size: 20px; font-weight: 400;
  color: var(--text-dim); transition: transform .3s ease, color .3s ease;
}
.faq details[open] summary::after { transform: translateY(-50%) rotate(45deg); color: var(--accent-b); }
.faq .ans { padding: 0 4px 26px; color: var(--text-sub); font-size: 16px; max-width: 42em; }

/* ---- final cta ---- */
.final {
  text-align: center; padding: 150px 0;
  background:
    radial-gradient(60% 70% at 50% 100%, var(--glow-a), transparent 70%),
    radial-gradient(40% 50% at 50% 110%, var(--glow-b), transparent 70%);
}
.final h2 { font-size: clamp(30px, 4.6vw, 50px); }
.final .sub { margin: 18px auto 40px; max-width: 30em; }

/* ---- footer ---- */
.footer { border-top: 1px solid rgba(244,244,250,.07); padding: 56px 0 64px; font-size: 14px; color: var(--text-dim); }
.footer-grid { display: flex; justify-content: space-between; gap: 40px; flex-wrap: wrap; }
.footer .biz p { line-height: 1.9; }
.footer .biz .wordmark { font-size: 16px; color: var(--text-sub); display: inline-block; margin-bottom: 10px; }
.footer-links { display: flex; gap: 22px; flex-wrap: wrap; align-items: flex-start; }
.footer-links a { color: var(--text-dim); transition: color .2s; }
.footer-links a:hover { color: var(--text); }
.footer .copy { margin-top: 36px; font-family: var(--mono); font-size: 11px; letter-spacing: .1em; text-transform: uppercase; }

/* ---- reveal ---- */
.rv { opacity: 0; transform: translateY(26px); transition: opacity .8s ease, transform .8s ease; }
.rv.in { opacity: 1; transform: none; }
.rv-d1 { transition-delay: .12s; }
.rv-d2 { transition-delay: .24s; }
.rv-d3 { transition-delay: .36s; }

/* ---- reduced motion: everything readable, nothing moves ---- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .rv { opacity: 1; transform: none; }
  #hero-canvas { display: none; }
  .scroll-cue { display: none; }
  .process-track { height: auto; }
  .process-stage { position: static; min-height: 0; padding: 90px 0; }
  .step { opacity: 1; transform: none; }
  .thread line { stroke-dashoffset: 0; }
}