/* ── Rondo landing — Score paper, coral human ─────────────── */

:root {
  --score: #1f1e1c;
  --paper: #faf9f5;
  --coral: #e8684a;
  --stone: #a8a49c;
  --amber: #e0a93e;

  --bg: var(--score);
  --panel: color-mix(in oklab, var(--paper) 4%, var(--score));
  --panel-2: color-mix(in oklab, var(--paper) 7%, var(--score));
  --line: color-mix(in oklab, var(--paper) 11%, var(--score));
  --ink: var(--paper);
  --muted: var(--stone);
  --coral-soft: color-mix(in oklab, var(--coral) 16%, var(--score));

  --sans: "Pretendard Variable", Pretendard, -apple-system, "Apple SD Gothic Neo", sans-serif;
  --mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;

  --w: 1060px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: var(--coral); color: var(--score); }

/* Korean: never break inside a word */
:lang(ko) body, body:lang(ko) { word-break: keep-all; overflow-wrap: break-word; }

.mono { font-family: var(--mono); font-size: 0.82em; letter-spacing: -0.01em; }
.accent { color: var(--coral); }

/* grain */
.grain {
  position: fixed; inset: 0; z-index: 40; pointer-events: none; opacity: 0.05;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='120' height='120' filter='url(%23n)' opacity='0.6'/%3E%3C/svg%3E");
}

/* ── nav ─────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  max-width: var(--w); margin: 0 auto; padding: 18px 24px;
  backdrop-filter: blur(14px);
  background: color-mix(in oklab, var(--score) 82%, transparent);
}
.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; color: var(--ink); }
.wordmark { font-weight: 700; font-size: 1.16rem; letter-spacing: -0.02em; }
.nav-right { display: flex; align-items: center; gap: 20px; }

.lang-toggle { display: flex; align-items: center; gap: 6px; }
.lang-toggle button {
  background: none; border: 0; cursor: pointer; padding: 2px 3px;
  font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em;
  color: var(--muted); transition: color 0.15s;
}
.lang-toggle button[aria-pressed="true"] { color: var(--ink); }
.lang-toggle button:hover { color: var(--coral); }
.lang-sep { color: var(--line); }

/* ── buttons ─────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  background: var(--coral); color: var(--score);
  font-weight: 650; font-size: 0.98rem; letter-spacing: -0.01em;
  padding: 13px 22px; border-radius: 999px; text-decoration: none;
  transition: transform 0.16s ease, background 0.16s ease, box-shadow 0.16s ease;
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--coral) 45%, transparent);
}
.btn:hover {
  background: color-mix(in oklab, var(--paper) 14%, var(--coral));
  transform: translateY(-1px);
  box-shadow: 0 8px 30px -8px color-mix(in oklab, var(--coral) 55%, transparent);
}
.btn:active { transform: translateY(0); }
.btn-small { padding: 8px 16px; font-size: 0.86rem; }
.btn-big { padding: 16px 28px; font-size: 1.08rem; }
.btn-meta { opacity: 0.62; font-weight: 500; margin-left: 2px; }
.link-quiet { color: var(--muted); text-decoration: none; font-size: 0.95rem; transition: color 0.15s; }
.link-quiet:hover { color: var(--ink); }

/* ── hero ────────────────────────────────────────────────── */
.hero {
  max-width: var(--w); margin: 0 auto;
  padding: 96px 24px 110px;
  display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  gap: 48px; align-items: center;
  position: relative;
}
.hero::before {
  content: ""; position: absolute; inset: -140px 0 auto;
  height: 560px; pointer-events: none;
  background: radial-gradient(ellipse 55% 62% at 68% 30%, color-mix(in oklab, var(--coral) 9%, transparent), transparent 70%);
}
.eyebrow {
  font-family: var(--mono); font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--coral); margin-bottom: 22px;
}
.hero-title {
  font-size: clamp(2.4rem, 5.4vw, 4.1rem);
  line-height: 1.08; letter-spacing: -0.035em; font-weight: 800;
  text-wrap: balance;
}
.hero-title-dim { color: var(--muted); }
.hero-sub {
  margin-top: 26px; max-width: 34em;
  color: color-mix(in oklab, var(--paper) 78%, var(--stone));
  font-size: 1.08rem; text-wrap: pretty;
}
.cta-row { display: flex; align-items: center; gap: 26px; margin-top: 38px; flex-wrap: wrap; }
.cta-meta {
  margin-top: 18px; display: flex; align-items: center; gap: 12px;
  color: var(--muted); font-size: 0.85rem;
}
.beta-chip {
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--amber); border: 1px solid color-mix(in oklab, var(--amber) 45%, transparent);
  padding: 3px 10px; border-radius: 999px;
}

/* hero ring mark */
.hero-mark { display: flex; justify-content: center; }
.ring-svg { width: min(320px, 60vw); height: auto; }
.ring-arc {
  stroke-dasharray: 1300;
  stroke-dashoffset: 1300;
  animation: draw 1.4s cubic-bezier(0.6, 0, 0.2, 1) 0.25s forwards;
}
.ring-dot {
  transform-origin: 512px 512px;
  animation: breathe 3.4s ease-in-out 1.7s infinite;
  opacity: 0;
  animation-name: appear, breathe;
  animation-duration: 0.5s, 3.4s;
  animation-delay: 1.3s, 1.9s;
  animation-fill-mode: forwards, none;
  animation-iteration-count: 1, infinite;
  animation-timing-function: ease-out, ease-in-out;
}
@keyframes draw { to { stroke-dashoffset: 0; } }
@keyframes appear { from { opacity: 0; transform: scale(0.6); } to { opacity: 1; transform: scale(1); } }
@keyframes breathe { 0%, 100% { transform: scale(1); } 50% { transform: scale(1.09); } }

/* ── staff divider ───────────────────────────────────────── */
.staff {
  max-width: min(560px, 72vw); height: 25px; margin: 0 auto;
  background: repeating-linear-gradient(to bottom, var(--line) 0 1px, transparent 1px 6px);
  -webkit-mask-image: linear-gradient(to right, transparent, #000 18%, #000 82%, transparent);
  mask-image: linear-gradient(to right, transparent, #000 18%, #000 82%, transparent);
}

/* ── app mockup ──────────────────────────────────────────── */
.shot { max-width: var(--w); margin: 0 auto; padding: 96px 24px 40px; }
.window {
  border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  background: var(--panel);
  box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.55);
}
.window-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; border-bottom: 1px solid var(--line);
  background: var(--panel-2);
}
.tl { width: 11px; height: 11px; border-radius: 50%; background: var(--line); }
.window-title { margin-left: 10px; color: var(--muted); font-size: 0.72rem; }
.window-body {
  display: grid; grid-template-columns: 52px 1.5fr 0.8fr 1fr;
  min-height: 340px;
}
.col { padding: 16px 14px; border-right: 1px solid var(--line); min-width: 0; }
.col:last-child { border-right: 0; }

.col-rail { display: flex; flex-direction: column; align-items: center; gap: 14px; padding-top: 20px; }
.dot-s { width: 9px; height: 9px; border-radius: 50%; display: inline-block; flex: none; }
.dot-playing { background: var(--coral); }
.dot-fermata { background: var(--amber); animation: pulse 1.6s ease-in-out infinite; }
.dot-rest { background: color-mix(in oklab, var(--stone) 45%, var(--score)); }
.dot-coda { background: var(--stone); }
.dot-offkey { background: color-mix(in oklab, var(--coral) 55%, var(--score)); }
@keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--amber) 55%, transparent); } 50% { box-shadow: 0 0 0 6px transparent; } }

.col-agent { display: flex; flex-direction: column; gap: 12px; padding: 18px; }
.chat-line { display: flex; flex-direction: column; gap: 7px; }
.chat-line.user { align-items: flex-end; }
.chat-line.user .bar { background: color-mix(in oklab, var(--paper) 14%, var(--score)); height: 9px; }
.bar {
  display: block; height: 8px; border-radius: 4px;
  background: color-mix(in oklab, var(--paper) 8%, var(--score));
}
.bar.h { height: 12px; background: color-mix(in oklab, var(--paper) 13%, var(--score)); }
.chat-tool { color: var(--muted); font-size: 0.68rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-tool::first-letter { color: var(--coral); }
.fermata-banner {
  margin-top: auto; font-size: 0.72rem; color: var(--amber);
  border: 1px solid color-mix(in oklab, var(--amber) 35%, transparent);
  background: color-mix(in oklab, var(--amber) 7%, var(--score));
  padding: 8px 12px; border-radius: 8px;
}

.col-nav { font-size: 0.7rem; color: color-mix(in oklab, var(--paper) 72%, var(--stone)); padding-top: 18px; }
.tree { padding: 3.5px 6px; border-radius: 5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.tree.ind { padding-left: 18px; }
.tree.ind2 { padding-left: 30px; }
.tree.active { background: var(--coral-soft); color: var(--paper); }
.tree.dim { opacity: 0.45; }
.t-dir { color: var(--muted); }

.col-doc { display: flex; flex-direction: column; padding: 0; }
.doc-tabs { display: flex; gap: 2px; border-bottom: 1px solid var(--line); padding: 8px 10px 0; font-size: 0.66rem; }
.tab { padding: 6px 12px; border-radius: 7px 7px 0 0; color: var(--muted); }
.tab.active { background: var(--panel-2); color: var(--paper); border: 1px solid var(--line); border-bottom-color: var(--panel-2); }
.doc-body { display: flex; flex-direction: column; gap: 11px; padding: 20px 16px; }

.shot-caption { text-align: center; color: var(--muted); font-size: 0.92rem; margin-top: 26px; }

/* ── concept ─────────────────────────────────────────────── */
.concept { max-width: 720px; margin: 0 auto; padding: 96px 24px; text-align: center; }
.concept h2, .states h2, .download h2 {
  font-size: clamp(1.7rem, 3.4vw, 2.5rem);
  letter-spacing: -0.03em; line-height: 1.18; font-weight: 750;
  text-wrap: balance;
}
.concept-form { margin: 30px 0 26px; font-size: 1.5rem; color: var(--muted); letter-spacing: 0.35em; }
.concept-form .accent { font-weight: 700; }
.concept-body { color: color-mix(in oklab, var(--paper) 76%, var(--stone)); max-width: 36em; margin: 0 auto; text-wrap: pretty; }

/* ── features ────────────────────────────────────────────── */
.features {
  width: min(100% - 48px, var(--w)); margin: 84px auto;
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: 16px;
  overflow: hidden;
}
.feature { background: var(--bg); padding: 38px 36px; transition: background 0.25s; }
.feature:hover { background: var(--panel); }
.feature h3 { font-size: 1.14rem; letter-spacing: -0.02em; margin-bottom: 12px; font-weight: 700; }
.feature h3::before { content: "● "; color: var(--coral); font-size: 0.6em; vertical-align: 2px; margin-right: 6px; }
.feature p { color: color-mix(in oklab, var(--paper) 70%, var(--stone)); font-size: 0.97rem; text-wrap: pretty; }

/* ── states ──────────────────────────────────────────────── */
.states { max-width: 760px; margin: 0 auto; padding: 96px 24px; text-align: center; }
.state-list { list-style: none; margin-top: 46px; display: flex; flex-direction: column; gap: 4px; text-align: left; }
.state-list li {
  display: grid; grid-template-columns: 22px 130px 1fr; align-items: center; gap: 10px;
  padding: 13px 20px; border-radius: 12px; color: var(--muted);
}
.state-list li b { font-weight: 600; color: var(--ink); font-size: 0.85rem; }
.state-list li.state-fermata {
  background: color-mix(in oklab, var(--amber) 6%, var(--score));
  border: 1px solid color-mix(in oklab, var(--amber) 22%, transparent);
  color: color-mix(in oklab, var(--paper) 85%, var(--stone));
}
.state-list li.state-fermata b { color: var(--amber); }

/* ── download ────────────────────────────────────────────── */
.download { max-width: 680px; margin: 0 auto; padding: 110px 24px 130px; text-align: center; }
.dot-mascot { image-rendering: pixelated; margin-bottom: 22px; }
.dl-sub { color: var(--muted); margin: 16px 0 34px; }
.install-steps {
  margin: 46px auto 0; max-width: 30em; text-align: left;
  color: color-mix(in oklab, var(--paper) 72%, var(--stone));
  font-size: 0.94rem; display: flex; flex-direction: column; gap: 14px;
  list-style: none; counter-reset: step;
}
.install-steps li { counter-increment: step; display: flex; gap: 14px; }
.install-steps li::before {
  content: counter(step);
  font-family: var(--mono); font-size: 0.72rem; color: var(--coral);
  border: 1px solid color-mix(in oklab, var(--coral) 40%, transparent);
  width: 22px; height: 22px; border-radius: 50%; flex: none;
  display: inline-flex; align-items: center; justify-content: center;
  margin-top: 2px;
}

/* ── footer ──────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--line); }
.footer-inner {
  max-width: var(--w); margin: 0 auto; padding: 30px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap;
}
.footer-brand { display: flex; align-items: center; gap: 8px; }
.footer-brand .wordmark { font-size: 0.98rem; }
.footer-tag { color: var(--muted); font-size: 0.72rem; }

/* ── features page ───────────────────────────────────────── */
.nav-link {
  color: var(--muted); text-decoration: none; font-size: 0.92rem;
  transition: color 0.15s;
}
.nav-link:hover, .nav-link.active { color: var(--ink); }

.ft-hero { max-width: 780px; margin: 0 auto; padding: 86px 24px 30px; text-align: center; }
.ft-hero h1 {
  font-size: clamp(2rem, 4.6vw, 3.2rem); line-height: 1.12;
  letter-spacing: -0.03em; font-weight: 800; text-wrap: balance;
}
.ft-sub { color: var(--muted); margin-top: 20px; max-width: 38em; margin-inline: auto; text-wrap: pretty; }

.ft-section { max-width: var(--w); margin: 0 auto; padding: 84px 24px 60px; }
.ft-head { max-width: 640px; margin-bottom: 36px; }
.ft-num { color: var(--coral); font-size: 0.8rem; letter-spacing: 0.2em; margin-bottom: 14px; }
.ft-section h2 {
  font-size: clamp(1.5rem, 2.8vw, 2.1rem); letter-spacing: -0.025em;
  line-height: 1.2; font-weight: 750; margin-bottom: 14px; text-wrap: balance;
}
.ft-head > p:not(.ft-num) { color: color-mix(in oklab, var(--paper) 74%, var(--stone)); text-wrap: pretty; }
.ft-head em { color: var(--coral); font-style: normal; }

.frame {
  margin: 0; border: 1px solid var(--line); border-radius: 14px; overflow: hidden;
  background: var(--panel); box-shadow: 0 40px 90px -40px rgba(0, 0, 0, 0.55);
}
.frame img { display: block; width: 100%; height: auto; }
.frame-bar {
  display: flex; align-items: center; gap: 7px;
  padding: 11px 14px; border-bottom: 1px solid var(--line); background: var(--panel-2);
}
.frame-title { margin-left: 10px; color: var(--muted); font-size: 0.72rem; }

.ft-points {
  list-style: none; margin-top: 30px; display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px 34px;
  color: color-mix(in oklab, var(--paper) 72%, var(--stone)); font-size: 0.95rem;
}
.ft-points li { padding-left: 18px; position: relative; text-wrap: pretty; }
.ft-points li::before { content: "●"; position: absolute; left: 0; top: 2px; color: var(--coral); font-size: 0.55em; }
.ft-points b { color: var(--ink); font-weight: 650; }
.ft-points code {
  font-family: var(--mono); font-size: 0.85em;
  background: var(--panel-2); border: 1px solid var(--line);
  padding: 1px 5px; border-radius: 5px;
}

.ft-split { display: flex; align-items: end; gap: 40px; }
.ft-split .ft-points { flex: 1; }
.ft-inset {
  flex: none; border: 1px solid var(--line); border-radius: 12px;
  background: var(--panel); max-width: 320px; height: auto;
}

.ft-cols { display: grid; grid-template-columns: 1fr 0.9fr; gap: 52px; align-items: start; }
.ft-head-side { margin-bottom: 0; }
.ft-head-side .ft-points { grid-template-columns: 1fr; margin-top: 26px; }
.frame-tall { max-width: 460px; justify-self: end; }

@media (max-width: 860px) {
  .ft-cols { grid-template-columns: 1fr; }
  .frame-tall { justify-self: center; }
  .ft-split { flex-direction: column; align-items: stretch; }
  .ft-inset { align-self: center; }
  .ft-section { padding: 64px 20px 40px; }
}

/* 홈: 기능 카드 링크 + 실 스크린샷 프레임 */
.feature { display: block; text-decoration: none; color: inherit; }
.feature-more { display: inline-block; margin-top: 14px; color: var(--coral); font-size: 0.88rem; }
.features-cta { text-align: center; margin: -40px auto 90px; }
.window-shot { display: block; width: 100%; height: auto; }

/* ── reveal on scroll (html.js = progressive enhancement) ── */
html.js .reveal { opacity: 0; transform: translateY(18px); transition: opacity 0.7s ease, transform 0.7s ease; }
html.js .reveal.in { opacity: 1; transform: none; }

/* ── responsive ──────────────────────────────────────────── */
@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; padding-top: 64px; gap: 40px; text-align: center; }
  .hero-sub { margin-left: auto; margin-right: auto; }
  .cta-row, .cta-meta { justify-content: center; }
  .hero-mark { order: -1; }
  .ring-svg { width: 180px; }
  .features { grid-template-columns: 1fr; }
  .window-body { grid-template-columns: 42px 1.6fr 1fr; }
  .col-doc { display: none; }
  .state-list li { grid-template-columns: 18px 108px 1fr; padding: 12px 14px; }
  .only-desktop { display: none; }
  .concept-form { font-size: 1.1rem; letter-spacing: 0.24em; white-space: nowrap; }
}
@media (max-width: 520px) {
  .window-body { grid-template-columns: 36px 1fr; }
  .col-nav { display: none; }
  .footer-inner { justify-content: center; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  .ring-arc { animation: none; stroke-dashoffset: 0; }
  .ring-dot { animation: none; opacity: 1; }
  .dot-fermata { animation: none; }
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}