/* ============================
   Toss-ish minimal fintech style
   - rounded cards
   - subtle shadows
   - clear hierarchy
   - smooth micro motion
   ============================ */

:root{
  --bg: #ffffff;
  --bg-elev: rgba(255,255,255,0.72);
  --text: #101828;
  --muted: #667085;
  --border: rgba(16,24,40,0.10);
  --shadow: 0 10px 30px rgba(16,24,40,0.10);
  --shadow-soft: 0 8px 20px rgba(16,24,40,0.08);
  --accent: #1f6fff;
  --accent-2: #2dd4bf;
  --accent-soft: rgba(31,111,255,0.14);
  --radius: 18px;
  --radius-sm: 14px;
  --container: 1040px;
  --blur: 14px;
  --ease: cubic-bezier(.2,.9,.2,1);
}

html[data-theme="dark"]{
  --bg: #0b0f17;
  --bg-elev: rgba(16,24,40,0.55);
  --text: #e6e9ef;
  --muted: #a0a7b5;
  --border: rgba(230,233,239,0.10);
  --shadow: 0 10px 30px rgba(0,0,0,0.55);
  --shadow-soft: 0 8px 20px rgba(0,0,0,0.40);
  --accent: #6aa5ff;
  --accent-2: #2dd4bf;
  --accent-soft: rgba(106,165,255,0.16);
}

*{ box-sizing: border-box; }
html,body{ height: 100%; }
body{
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, "Noto Sans KR", Arial, sans-serif;
  background: radial-gradient(1200px 800px at 12% 8%, rgba(31,111,255,0.12), transparent 60%),
              radial-gradient(900px 650px at 90% 20%, rgba(45,212,191,0.10), transparent 55%),
              var(--bg);
  color: var(--text);
  letter-spacing: -0.01em;
}

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

.container{
  width: min(var(--container), calc(100% - 48px));
  margin: 0 auto;
}

.main{
  padding-top: 78px;
  min-height: calc(100vh - 78px);
}

/* Screen-reader only */
.sr-only{
  position:absolute!important;
  width:1px!important;
  height:1px!important;
  padding:0!important;
  margin:-1px!important;
  overflow:hidden!important;
  clip:rect(0,0,0,0)!important;
  white-space:nowrap!important;
  border:0!important;
}

/* Topbar */
.topbar{
  position: fixed;
  inset: 0 0 auto 0;
  height: 78px;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 70%, transparent);
  backdrop-filter: blur(var(--blur));
}

.topbar__inner{
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand{
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 999px;
}

.brand__mark{
  width: 26px; height: 26px;
  border-radius: 10px;
  background:
    radial-gradient(12px 12px at 35% 35%, rgba(255,255,255,0.95), rgba(255,255,255,0) 60%),
    linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 8px 16px rgba(31,111,255,0.18);
}

.brand__text{
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* Nav */
.nav{
  display: flex;
  gap: 10px;
  padding: 6px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
}

.nav__link{
  padding: 10px 12px;
  border-radius: 999px;
  color: var(--muted);
  font-weight: 600;
  font-size: 14px;
  transition: background 180ms var(--ease), color 180ms var(--ease);
}

.nav__link:hover{
  background: color-mix(in srgb, var(--accent-soft) 65%, transparent);
  color: var(--text);
}

.nav__link.is-active{
  background: color-mix(in srgb, var(--accent-soft) 92%, transparent);
  color: var(--text);
}

.topbar__actions{
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Language selector */
.select{
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  color: var(--text);
  padding: 0 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  outline: none;
  cursor: pointer;
}
.select:hover{
  background: color-mix(in srgb, var(--accent-soft) 45%, transparent);
}

/* Icon button */
.iconbtn{
  width: 42px; height: 42px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  display: grid; place-items: center;
  cursor: pointer;
  transition: transform 140ms var(--ease), background 180ms var(--ease);
}

.iconbtn:hover{ transform: translateY(-1px); }
.iconbtn:active{ transform: translateY(0px) scale(0.98); }
.icon{
  width: 18px; height: 18px;
  display: inline-block;
  background: var(--text);
  mask-size: contain;
  mask-repeat: no-repeat;
  mask-position: center;
  opacity: 0.88;
}

/* Hero */
.hero{
  padding: 48px 0 30px;
}

.hero__grid{
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 26px;
  align-items: start;
}

.kicker{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: color-mix(in srgb, var(--muted) 85%, transparent);
}

.kicker::before{
  content: "";
  width: 10px; height: 10px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.h1{
  font-size: clamp(34px, 4vw, 52px);
  line-height: 1.06;
  margin: 12px 0 10px;
  letter-spacing: -0.04em;
}

.h2{
  font-size: 20px;
  margin: 0 0 10px;
  letter-spacing: -0.02em;
}

.lead{
  font-size: 16px;
  line-height: 1.7;
  margin: 0;
  color: var(--muted);
  max-width: 58ch;
}

.hero__cta{
  display: flex;
  gap: 12px;
  margin-top: 18px;
  flex-wrap: wrap;
}

.hero__chips{
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.section{
  margin-top: 34px;
  padding-top: 22px;
}

.section__head{
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 18px;
  margin-bottom: 14px;
}

.muted{ color: var(--muted); line-height: 1.7; margin: 0; }

/* Cards */
.card{
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.card--glass{
  background: var(--bg-elev);
  backdrop-filter: blur(var(--blur));
}

.card--soft{
  background: color-mix(in srgb, var(--accent-soft) 40%, var(--bg));
  box-shadow: none;
}

.card--hover{
  transition: transform 180ms var(--ease), box-shadow 220ms var(--ease);
}

.card--hover:hover{
  transform: translateY(-4px);
  box-shadow: var(--shadow);
}

.card__header{
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 18px 18px 12px;
}

.avatar{
  width: 44px; height: 44px;
  border-radius: 16px;
  background:
    radial-gradient(16px 16px at 30% 30%, rgba(255,255,255,0.92), rgba(255,255,255,0) 60%),
    linear-gradient(135deg, color-mix(in srgb, var(--accent) 85%, white),
                          color-mix(in srgb, var(--accent-2) 70%, white));
  box-shadow: 0 10px 18px rgba(31,111,255,0.20);
}

.card__title{
  font-weight: 700;
  letter-spacing: -0.02em;
}

.card__subtitle{
  margin-top: 3px;
  font-size: 13px;
  color: var(--muted);
}

.card__body{
  padding: 16px 18px 18px;
}

.card__text{
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.card__footer{
  padding: 14px 18px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.card__footer--split{
  justify-content: space-between;
}

.card__topline{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.divider{ height: 1px; background: var(--border); margin: 14px 0; }

/* Soft boxes (for guitar page blocks) */
.softbox{
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  padding: 12px 12px;
}
.softbox__title{
  font-weight: 800;
  letter-spacing: -0.02em;
}

/* Stats / List */
.stat__label{
  font-size: 12px;
  color: var(--muted);
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.stat__value{
  margin-top: 6px;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.mini-list{ display: grid; gap: 12px; }
.mini-list__title{ font-weight: 700; }
.mini-list__desc{ color: var(--muted); margin-top: 4px; line-height: 1.6; font-size: 14px; }

/* Grid */
.grid{ display: grid; gap: 14px; }
.grid--cards{ grid-template-columns: repeat(3, 1fr); }
.grid--two{ grid-template-columns: repeat(2, 1fr); }

/* Chips / Tags */
.chip{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  font-weight: 600;
  font-size: 13px;
  color: color-mix(in srgb, var(--text) 88%, transparent);
  transition: transform 160ms var(--ease), background 180ms var(--ease);
}

.chip:hover{ transform: translateY(-1px); }

.chip--soft{
  background: color-mix(in srgb, var(--accent-soft) 60%, var(--bg));
  border: 1px solid color-mix(in srgb, var(--accent-soft) 75%, var(--border));
}

.chipset{ display: flex; flex-wrap: wrap; gap: 10px; }

.tagrow{ display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag{
  font-size: 12px;
  font-weight: 700;
  letter-spacing: -0.01em;
  padding: 7px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border: 1px solid var(--border);
  color: color-mix(in srgb, var(--muted) 92%, transparent);
}

/* Pills / Links */
.pill{
  font-size: 12px;
  font-weight: 700;
  padding: 7px 10px;
  border-radius: 999px;
  background: color-mix(in srgb, var(--accent-soft) 70%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent-soft) 90%, var(--border));
  color: color-mix(in srgb, var(--text) 90%, transparent);
}

.link{
  font-weight: 700;
  color: color-mix(in srgb, var(--accent) 90%, var(--text));
  transition: opacity 180ms var(--ease);
}
.link:hover{ opacity: 0.85; }

.links{ display: flex; gap: 12px; flex-wrap: wrap; }

/* Buttons */
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid transparent;
  font-weight: 800;
  letter-spacing: -0.02em;
  cursor: pointer;
  transition: transform 140ms var(--ease), filter 200ms var(--ease), background 200ms var(--ease);
  user-select: none;
}

.btn:active{ transform: scale(0.985); }

.btn--primary{
  background: linear-gradient(135deg, var(--accent), color-mix(in srgb, var(--accent) 45%, var(--accent-2)));
  color: white;
  box-shadow: 0 14px 24px rgba(31,111,255,0.25);
}

.btn--primary:hover{ filter: brightness(1.03); }

.btn--ghost{
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  border: 1px solid var(--border);
  color: var(--text);
}

.btn--ghost:hover{
  background: color-mix(in srgb, var(--accent-soft) 55%, transparent);
}

.btn--small{
  padding: 10px 12px;
  border-radius: 12px;
  font-size: 13px;
}

.btn__arrow{ font-size: 16px; opacity: 0.9; }

/* Pages */
.page{ padding: 34px 0 40px; }
.page__head{ margin-bottom: 18px; }
.center{ text-align: center; }

/* Timeline / list */
.timeline{ display: grid; gap: 14px; }
.timeline__item{ padding: 12px 0; border-bottom: 1px dashed var(--border); }
.timeline__head{ display: grid; gap: 6px; margin-bottom: 10px; }
.timeline__title{ font-weight: 800; }
.timeline__meta{ color: var(--muted); font-size: 13px; }
.list{ margin: 0; padding-left: 18px; color: var(--muted); line-height: 1.7; }

/* Footer */
.footer{
  padding: 28px 0 42px;
  border-top: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 80%, transparent);
}

.footer__inner{
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.footer__title{ font-weight: 800; }
.footer__meta{ color: var(--muted); font-size: 13px; margin-top: 4px; }

/* Code-ish box */
.pre{
  margin: 0;
  padding: 14px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--bg) 75%, transparent);
  overflow-x: auto;
  line-height: 1.6;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 13px;
}

/* Reveal motion */
.reveal{
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 520ms var(--ease), transform 520ms var(--ease);
  will-change: transform, opacity;
}
.reveal.is-visible{
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce){
  *{ transition: none !important; scroll-behavior: auto !important; }
  .reveal{ opacity: 1; transform: none; }
}

/* Responsive */
@media (max-width: 940px){
  .hero__grid{ grid-template-columns: 1fr; }
  .grid--cards{ grid-template-columns: 1fr; }
  .grid--two{ grid-template-columns: 1fr; }
  .nav{ display: none; }
}