:root {
  color-scheme: dark;
  --page: #0b1114;
  --surface: #111a1e;
  --surface-raised: #172126;
  --surface-soft: #0f171a;
  --border: #29383d;
  --border-strong: #3b4d52;
  --text: #edf2ef;
  --muted: #a1afab;
  --subtle: #758580;
  --mint: #79d8c3;
  --gold: #d8bd83;
  --coral: #ed898f;
  --blue: #91b7ef;
  --lilac: #b5a3ea;
  --sans: "Pretendard", "Malgun Gothic", "Apple SD Gothic Neo", "Segoe UI", sans-serif;
  --mono: "Cascadia Mono", "Consolas", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--page);
  color: var(--text);
  font-family: var(--sans);
  font-size: 15px;
  line-height: 1.7;
  word-break: keep-all;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }
.container { width: min(1120px, calc(100% - 56px)); margin-inline: auto; }

.site-header {
  height: 76px;
  border-bottom: 1px solid rgba(237, 242, 239, .08);
  background: var(--page);
}
.header-inner { height: 100%; display: flex; align-items: center; justify-content: space-between; gap: 28px; }
.brand { min-width: 190px; display: inline-flex; align-items: center; gap: 11px; }
.brand-symbol {
  width: 42px; height: 42px; flex: 0 0 42px; display: grid; place-items: center;
  border: 1px solid #34474a; border-radius: 12px; background: #152124; color: var(--mint);
}
.brand-symbol svg { width: 26px; height: 26px; }
.brand-label { display: grid; line-height: 1.2; }
.brand-label strong { font-size: 15px; font-weight: 700; letter-spacing: .02em; }
.brand-label small { margin-top: 4px; color: var(--subtle); font: 8px/1.2 var(--mono); letter-spacing: .12em; }
.main-nav { display: flex; align-items: center; gap: 34px; color: var(--muted); font-size: 12px; }
.main-nav a, .footer-links a { transition: color .18s ease; }
.main-nav a:hover, .footer-links a:hover { color: var(--mint); }
.header-cta {
  min-width: 112px; display: inline-flex; justify-content: center; align-items: center; gap: 12px;
  padding: 9px 13px; border: 1px solid var(--border-strong); border-radius: 5px;
  font-size: 11px; font-weight: 600; transition: border-color .18s ease, color .18s ease;
}
.header-cta span { color: var(--gold); font-size: 14px; }
.header-cta:hover { border-color: var(--mint); color: var(--mint); }

.hero {
  min-height: 570px; padding-block: 72px 76px; display: grid;
  grid-template-columns: minmax(0, .96fr) minmax(390px, 1.04fr); align-items: center; gap: 70px;
}
.hero-copy { min-width: 0; }
.eyebrow { margin: 0; color: var(--mint); font: 9px/1.5 var(--mono); letter-spacing: .16em; }
.status-dot { width: 6px; height: 6px; display: inline-block; margin: 0 8px 1px 0; border-radius: 50%; background: var(--mint); }
.hero h1 { margin: 22px 0 17px; font-size: clamp(42px, 5vw, 62px); line-height: 1.25; letter-spacing: -.065em; font-weight: 700; }
.hero h1 span { color: var(--mint); }
.hero-description { max-width: 470px; margin: 0; color: var(--muted); font-size: 14px; line-height: 1.95; }
.hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 10px; margin-top: 29px; }
.button { min-height: 43px; padding: 10px 15px; display: inline-flex; justify-content: center; align-items: center; gap: 13px; border-radius: 5px; font-size: 11px; font-weight: 600; transition: background .18s ease, border-color .18s ease, transform .18s ease; }
.button:hover { transform: translateY(-1px); }
.button-primary { border: 1px solid var(--mint); background: var(--mint); color: #101919; }
.button-primary:hover { background: #95e4d3; }
.button-primary span { font-size: 14px; }
.button-secondary { border: 1px solid var(--border-strong); color: var(--text); }
.button-secondary:hover { border-color: var(--mint); color: var(--mint); }
.hero-trust { margin-top: 19px; color: var(--subtle); font-size: 10px; }
.hero-trust span { margin-right: 7px; color: var(--mint); }

.product-preview {
  min-width: 0; padding: 18px; border: 1px solid var(--border); border-radius: 9px;
  background: var(--surface); box-shadow: 0 24px 64px rgba(0, 0, 0, .22);
}
.preview-heading { min-height: 48px; display: flex; align-items: center; gap: 11px; padding-bottom: 14px; border-bottom: 1px solid var(--border); }
.preview-app-icon { width: 34px; height: 34px; flex: 0 0 34px; display: grid; place-items: center; border: 1px solid #34534d; border-radius: 9px; background: #18302c; color: var(--mint); font-size: 17px; }
.preview-heading-text { min-width: 0; display: grid; line-height: 1.35; }
.preview-heading-text strong { font-size: 11px; }
.preview-heading-text span { margin-top: 3px; color: var(--subtle); font-size: 9px; }
.preview-live { margin-left: auto; color: var(--muted); font-size: 9px; white-space: nowrap; }
.preview-live i, .preview-footer i { width: 6px; height: 6px; display: inline-block; margin-right: 5px; border-radius: 50%; background: var(--gold); }
.preview-platforms { display: flex; flex-wrap: wrap; gap: 7px; padding: 15px 0; }
.platform-chip { min-height: 27px; display: inline-flex; align-items: center; gap: 6px; padding: 4px 8px; border: 1px solid var(--border); border-radius: 4px; color: var(--muted); font-size: 9px; }
.platform-chip b { font: 9px var(--mono); }
.chzzk b, .message-platform.chzzk { color: var(--mint); }
.youtube b, .message-platform.youtube { color: var(--coral); }
.soop b, .message-platform.soop { color: var(--blue); }
.preview-metrics { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 7px; }
.preview-metrics > div { min-width: 0; padding: 10px 9px; border: 1px solid var(--border); border-radius: 5px; background: var(--surface-soft); }
.preview-metrics span, .preview-metrics strong { display: block; overflow-wrap: anywhere; }
.preview-metrics span { color: var(--subtle); font-size: 8px; }
.preview-metrics strong { margin-top: 3px; color: var(--text); font-size: 10px; font-weight: 500; }
.preview-messages { margin-top: 8px; }
.preview-message { min-width: 0; display: grid; grid-template-columns: 25px minmax(0, 1fr) auto; align-items: start; gap: 9px; padding: 12px 2px; border-bottom: 1px solid rgba(237, 242, 239, .06); }
.message-platform { width: 24px; height: 24px; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 6px; background: var(--surface-raised); font: 8px var(--mono); }
.preview-message p { min-width: 0; margin: 0; display: grid; line-height: 1.55; }
.preview-message p b { font-size: 10px; font-weight: 600; }
.preview-message p span { margin-top: 2px; color: #c1cbc7; font-size: 10px; overflow-wrap: anywhere; }
.preview-message time { padding-top: 2px; color: var(--subtle); font: 8px var(--mono); white-space: nowrap; }
.preview-footer { min-height: 33px; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 6px 14px; padding-top: 10px; color: var(--subtle); font-size: 8px; }
.preview-footer i { width: 5px; height: 5px; background: var(--mint); }

.platform-band { border-block: 1px solid var(--border); background: #0e1619; }
.platform-band-inner { min-height: 102px; display: grid; grid-template-columns: 1.3fr repeat(3, 1fr) 1.2fr; align-items: center; gap: 24px; }
.platform-band-title { margin: 0; color: var(--text); font-size: 11px; line-height: 1.45; font-weight: 600; }
.platform-band-title span { color: var(--subtle); font-size: 9px; font-weight: 400; }
.platform-name { min-width: 0; display: flex; align-items: center; gap: 9px; font-size: 11px; font-weight: 600; }
.platform-logo { width: 33px; height: 33px; flex: 0 0 33px; display: grid; place-items: center; border: 1px solid var(--border); border-radius: 8px; font: 9px var(--mono); }
.platform-logo.chzzk { border-color: #31574f; background: #18302c; color: var(--mint); }
.platform-logo.youtube { border-color: #55353b; background: #332328; color: var(--coral); }
.platform-logo.soop { border-color: #344965; background: #202d40; color: var(--blue); }
.platform-name > span:last-child { min-width: 0; display: grid; line-height: 1.25; }
.platform-name small { margin-top: 4px; color: var(--subtle); font: 7px var(--mono); letter-spacing: .07em; }
.platform-band-note { justify-self: end; margin: 0; color: var(--muted); font-size: 9px; }

.section { padding-block: 100px 106px; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 32px; margin-bottom: 29px; }
.section-heading h2, .guide-heading h2 { margin: 12px 0 0; font-size: clamp(27px, 3.2vw, 37px); line-height: 1.4; letter-spacing: -.05em; }
.section-intro { margin: 0 0 4px; color: var(--muted); font-size: 11px; line-height: 1.9; }
.feature-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 11px; }
.feature-card { min-width: 0; min-height: 238px; position: relative; padding: 21px 19px; border: 1px solid var(--border); border-radius: 7px; background: var(--surface); }
.feature-number { position: absolute; top: 25px; right: 19px; color: var(--subtle); font: 8px var(--mono); letter-spacing: .08em; }
.feature-icon { width: 34px; height: 34px; display: grid; place-items: center; border-radius: 8px; font-size: 17px; }
.icon-mint { background: #18302c; color: var(--mint); }
.icon-gold { background: #302a1f; color: var(--gold); }
.icon-blue { background: #202d40; color: var(--blue); }
.icon-lilac { background: #2b2638; color: var(--lilac); }
.feature-card h3 { margin: 19px 0 7px; font-size: 13px; letter-spacing: -.02em; }
.feature-card p { margin: 0; color: var(--muted); font-size: 10px; line-height: 1.85; }
.feature-tags, .step-tags { display: flex; flex-wrap: wrap; gap: 5px; margin-top: 16px; }
.feature-tags span, .step-tags span { padding: 3px 7px; border: 1px solid var(--border); border-radius: 3px; color: #b6c1bd; font-size: 8px; }
.shortcut-list { display: flex; flex-wrap: wrap; align-items: center; gap: 4px; margin-top: 15px; color: var(--subtle); font-size: 8px; }
.shortcut-list kbd { padding: 3px 5px; border: 1px solid var(--border-strong); border-radius: 3px; background: var(--surface-soft); color: #d2dbd7; font: 8px var(--mono); }
.shortcut-list span { margin: 0 7px 0 2px; }

.guide-section { padding-block: 77px; border-block: 1px solid var(--border); background: #0e1619; }
.guide-layout { display: grid; grid-template-columns: minmax(230px, .82fr) minmax(0, 1.18fr); gap: 80px; }
.guide-heading h2 { font-size: clamp(28px, 3.4vw, 40px); }
.guide-heading > p:not(.eyebrow) { max-width: 350px; margin: 14px 0 19px; color: var(--muted); font-size: 11px; line-height: 1.9; }
.text-link { display: inline-flex; align-items: center; gap: 9px; color: var(--mint); font-size: 10px; font-weight: 600; }
.text-link:hover { color: #a3ebdc; }
.text-link span { color: var(--gold); font-size: 13px; }
.steps { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--border); }
.steps li { display: grid; grid-template-columns: 36px minmax(0, 1fr); gap: 13px; padding: 18px 0; border-bottom: 1px solid var(--border); }
.step-index { padding-top: 2px; color: var(--gold); font: 9px var(--mono); }
.steps h3 { margin: 0; font-size: 12px; }
.steps p { margin: 4px 0 7px; color: var(--muted); font-size: 10px; line-height: 1.8; }
.steps a { color: var(--mint); font-size: 9px; }
.step-tags { margin-top: 7px; }

.support-section { display: grid; grid-template-columns: 34px minmax(0, 1fr) auto; align-items: start; gap: 15px; padding-block: 61px 65px; }
.support-icon { width: 30px; height: 30px; display: grid; place-items: center; border: 1px solid var(--border-strong); border-radius: 50%; color: var(--gold); font: 11px var(--mono); }
.support-copy h2 { margin: 7px 0 6px; font-size: 13px; }
.support-copy > p:last-child { max-width: 780px; margin: 0; color: var(--muted); font-size: 9px; line-height: 1.9; }
.support-link { margin-top: 4px; padding: 7px 10px; border: 1px solid var(--border-strong); border-radius: 4px; color: #c7d0cc; font-size: 9px; white-space: nowrap; }
.support-link span { margin-left: 7px; color: var(--gold); }
.support-link:hover { border-color: var(--mint); color: var(--mint); }

.site-footer { border-top: 1px solid var(--border); background: #0a1012; }
.footer-inner { min-height: 72px; display: flex; align-items: center; gap: 20px; }
.footer-brand { color: var(--text); font-size: 11px; font-weight: 700; white-space: nowrap; }
.footer-brand span { margin-right: 5px; color: var(--mint); font-size: 15px; }
.footer-inner > p { margin: 0; color: var(--subtle); font-size: 9px; }
.footer-links { margin-left: auto; display: flex; gap: 16px; color: #9eaca7; font-size: 9px; }

@media (max-width: 940px) {
  .hero { grid-template-columns: minmax(0, .9fr) minmax(340px, 1.1fr); gap: 34px; }
  .platform-band-inner { grid-template-columns: repeat(3, 1fr); gap: 18px; padding-block: 18px; }
  .platform-band-title { grid-column: 1 / 2; }
  .platform-band-note { grid-column: 2 / 4; justify-self: start; }
  .feature-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .feature-card { min-height: 212px; }
  .guide-layout { gap: 42px; }
}

@media (max-width: 700px) {
  .container { width: min(100% - 36px, 560px); }
  .site-header { height: 68px; }
  .brand { min-width: 0; }
  .brand-symbol { width: 38px; height: 38px; flex-basis: 38px; }
  .main-nav { display: none; }
  .header-cta { min-width: 96px; padding: 8px 10px; }
  .hero { min-height: 0; grid-template-columns: minmax(0, 1fr); gap: 37px; padding-block: 57px 50px; }
  .hero h1 { font-size: clamp(39px, 10vw, 54px); }
  .hero-description { max-width: 540px; }
  .product-preview { width: 100%; }
  .platform-band-inner { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px 10px; }
  .platform-band-title { grid-column: 1 / -1; }
  .platform-band-note { grid-column: 1 / -1; justify-self: start; }
  .platform-name { gap: 7px; font-size: 10px; }
  .platform-logo { width: 29px; height: 29px; flex-basis: 29px; }
  .section { padding-block: 70px 75px; }
  .section-heading { display: block; margin-bottom: 22px; }
  .section-intro { margin-top: 12px; }
  .guide-section { padding-block: 57px; }
  .guide-layout { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .support-section { grid-template-columns: 31px minmax(0, 1fr); gap: 12px; padding-block: 48px; }
  .support-link { grid-column: 2; justify-self: start; }
  .footer-inner { min-height: 0; flex-wrap: wrap; gap: 7px 14px; padding-block: 17px; }
  .footer-inner > p { order: 3; flex-basis: 100%; }
  .footer-links { margin-left: auto; }
}

@media (max-width: 430px) {
  .container { width: calc(100% - 30px); }
  body { font-size: 14px; }
  .hero { padding-block: 45px 39px; }
  .hero h1 { font-size: 39px; }
  .hero-description { font-size: 12px; }
  .hero-actions { align-items: stretch; }
  .button { padding-inline: 11px; font-size: 10px; }
  .product-preview { padding: 13px; }
  .preview-metrics { gap: 5px; }
  .preview-metrics > div { padding: 8px 6px; }
  .preview-metrics span { font-size: 7px; }
  .preview-metrics strong { font-size: 9px; }
  .preview-message { grid-template-columns: 23px minmax(0, 1fr) auto; gap: 7px; }
  .preview-message p span { font-size: 9px; }
  .feature-grid { grid-template-columns: minmax(0, 1fr); }
  .feature-card { min-height: 0; padding-bottom: 19px; }
  .footer-links { gap: 10px; }
}

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