:root {
  color-scheme: dark;
  --bg: #090b0a;
  --surface: #111412;
  --surface-raised: #171b18;
  --border: #2b302d;
  --text: #f4f5f4;
  --muted: #9da49f;
  --green: #36e077;
  --green-dark: #123f25;
  --red: #ff5e69;
  --amber: #ffbd4a;
  --blue: #65a7ff;
  --shadow: rgba(0, 0, 0, 0.35);
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f3f5f2;
  --surface: #fff;
  --surface-raised: #f8faf7;
  --border: #d9dfda;
  --text: #151816;
  --muted: #636b65;
  --green: #087f3b;
  --green-dark: #dff5e7;
  --shadow: rgba(25, 40, 30, 0.1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, Pretendard, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}
button, a { font: inherit; }
a { color: inherit; text-decoration: none; }
button { color: inherit; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  padding: 0 max(24px, calc((100vw - 1180px) / 2));
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
}

.brand { display: inline-flex; align-items: center; gap: 9px; font-size: 15px; font-weight: 800; letter-spacing: .07em; }
.brand strong { color: var(--green); }
.brand-mark { display: grid; place-items: center; width: 30px; height: 30px; color: #071009; background: var(--green); border-radius: 8px; font-size: 18px; }
nav { display: flex; align-items: center; gap: 28px; }
nav a { color: var(--muted); font-size: 14px; font-weight: 600; }
nav a:hover { color: var(--text); }
.theme-toggle { display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--border); border-radius: 50%; background: var(--surface); cursor: pointer; }

main { overflow: hidden; }
.hero {
  position: relative;
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  align-items: center;
  min-height: 620px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 90px 24px;
}
.hero::before { content: ""; position: absolute; right: -180px; width: 550px; height: 550px; background: radial-gradient(circle, color-mix(in srgb, var(--green) 20%, transparent), transparent 68%); pointer-events: none; }
.eyebrow { margin: 0 0 15px; color: var(--green); font-size: 12px; font-weight: 800; letter-spacing: .18em; }
h1 { margin: 0; font-size: clamp(48px, 7vw, 84px); line-height: .98; letter-spacing: -.055em; }
h1 span { color: var(--green); }
.hero-description { max-width: 580px; margin: 28px 0 35px; color: var(--muted); font-size: 18px; }
.primary-link { display: inline-flex; align-items: center; gap: 22px; padding: 13px 20px; color: #071009; background: var(--green); border-radius: 8px; font-weight: 800; }
.hero-cards { position: relative; height: 350px; }
.playing-card { position: absolute; top: 30px; display: flex; flex-direction: column; justify-content: space-between; width: 190px; height: 270px; padding: 18px; background: #f8f8f5; border-radius: 16px; box-shadow: 0 24px 60px var(--shadow); font-family: Georgia, serif; font-size: 46px; font-weight: 700; line-height: 1; }
.playing-card span:last-child { align-self: center; font-size: 92px; }
.red { left: 70px; color: #d7333e; transform: rotate(-10deg); }
.black { left: 225px; color: #101412; transform: rotate(8deg); }
.score-chip { position: absolute; right: 10px; bottom: 15px; padding: 13px 19px; color: #071009; background: var(--green); border: 6px solid #0c2515; border-radius: 50%; text-align: center; font-size: 10px; font-weight: 800; line-height: 1.2; transform: rotate(-8deg); }
.score-chip strong { font-size: 17px; }

.calculator-section, .guide-section, .betting-section { padding: 95px max(24px, calc((100vw - 1180px) / 2)); border-top: 1px solid var(--border); }
.calculator-section { background: var(--surface); }
.section-heading { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 42px; }
.section-heading h2 { margin: 0; font-size: clamp(32px, 5vw, 48px); letter-spacing: -.04em; }
.rule-summary { margin: 0; color: var(--muted); font-size: 13px; }
.calculator-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(320px, .75fr); gap: 28px; align-items: start; }
.selection-panel, .result-panel { border: 1px solid var(--border); border-radius: 16px; background: var(--bg); }
.selection-step { padding: 28px; border-bottom: 1px solid var(--border); }
.selection-step:last-child { border-bottom: 0; }
.step-heading { display: flex; gap: 15px; align-items: flex-start; margin-bottom: 20px; }
.step-number { display: grid; place-items: center; width: 36px; height: 36px; flex: 0 0 auto; color: var(--green); border: 1px solid var(--green); border-radius: 50%; font-size: 11px; font-weight: 800; }
.step-heading h3 { margin: -3px 0 0; font-size: 17px; }
.step-heading p { margin: 1px 0 0; color: var(--muted); font-size: 13px; }
.card-options { display: grid; grid-template-columns: repeat(10, 1fr); gap: 8px; }
.card-option { min-width: 0; aspect-ratio: .74; padding: 5px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface-raised); cursor: pointer; font-weight: 800; transition: .16s ease; }
.card-option:hover { border-color: var(--green); transform: translateY(-2px); }
.card-option.selected { color: #071009; background: var(--green); border-color: var(--green); box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 20%, transparent); }
.card-option:disabled { opacity: .35; cursor: not-allowed; transform: none; }
.dealer-step .step-number { color: var(--red); border-color: var(--red); }
.hit-step .step-number { color: var(--blue); border-color: var(--blue); }
.hit-card-history { display: flex; flex-wrap: wrap; gap: 8px; min-height: 38px; margin: 0 0 14px 51px; }
.history-empty { align-self: center; color: var(--muted); font-size: 12px; }
.history-card { display: grid; place-items: center; min-width: 38px; height: 38px; padding: 0 10px; color: var(--bg); background: var(--blue); border-radius: 7px; font-weight: 900; }
.hit-step .card-options { margin-left: 51px; }
.undo-hit-button { margin: 13px 0 0 51px; padding: 7px 11px; color: var(--muted); background: transparent; border: 1px solid var(--border); border-radius: 7px; cursor: pointer; font-size: 11px; }
.undo-hit-button:disabled { opacity: .35; cursor: not-allowed; }

.result-panel { position: sticky; top: 96px; min-height: 520px; padding: 28px; }
.result-status { display: flex; align-items: center; gap: 9px; color: var(--muted); font-size: 12px; font-weight: 700; }
.status-dot { width: 7px; height: 7px; background: var(--amber); border-radius: 50%; box-shadow: 0 0 10px var(--amber); }
.result-panel.ready .status-dot { background: var(--green); box-shadow: 0 0 10px var(--green); }
.empty-result { display: grid; place-items: center; min-height: 410px; text-align: center; }
.empty-result h3 { margin: 15px 0 4px; font-size: 18px; }
.empty-result p { max-width: 260px; margin: 0; color: var(--muted); font-size: 13px; }
.empty-cards { display: flex; gap: 8px; }
.empty-cards span { display: grid; place-items: center; width: 68px; height: 94px; color: var(--muted); border: 1px dashed var(--border); border-radius: 9px; font-size: 24px; }
.strategy-result { padding-top: 45px; text-align: center; }
.result-label { margin: 0 0 8px; color: var(--muted); font-size: 12px; font-weight: 700; letter-spacing: .1em; }
.action-badge { font-size: clamp(42px, 7vw, 64px); font-weight: 900; line-height: 1; letter-spacing: -.04em; color: var(--green); }
.action-badge[data-action="HIT"] { color: var(--blue); }
.action-badge[data-action="DOUBLE"] { color: var(--amber); }
.action-badge[data-action="SPLIT"], .action-badge[data-action="SURRENDER"] { color: var(--red); }
.action-badge[data-action="BUST"] { color: var(--red); }
.action-korean { margin: 5px 0 26px; color: var(--muted); font-weight: 700; }
.hand-summary { display: grid; grid-template-columns: 1fr 1fr; margin-bottom: 20px; border: 1px solid var(--border); border-radius: 10px; overflow: hidden; text-align: left; }
.hand-summary div { display: flex; justify-content: space-between; padding: 13px; }
.hand-summary div + div { border-left: 1px solid var(--border); }
.hand-summary span { color: var(--muted); font-size: 12px; }
.reason-box { display: flex; gap: 10px; padding: 15px; background: var(--surface-raised); border-radius: 10px; text-align: left; }
.reason-box span { display: grid; place-items: center; width: 20px; height: 20px; flex: 0 0 auto; color: var(--bg); background: var(--green); border-radius: 50%; font-size: 12px; font-weight: 900; }
.reason-box p { margin: 0; color: var(--muted); font-size: 13px; }
.result-actions { display: grid; grid-template-columns: 1fr; gap: 9px; margin-top: 20px; }
.add-hit-link { padding: 12px; color: #071009; background: var(--blue); border-radius: 8px; font-weight: 800; text-align: center; }
.add-hit-link[hidden] { display: none; }
.reset-button { width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 8px; background: transparent; cursor: pointer; font-weight: 700; }
.reset-button:hover { border-color: var(--green); }

.guide-section { background: var(--bg); }
.action-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 14px; }
.action-grid article { padding: 22px; background: var(--surface); border: 1px solid var(--border); border-radius: 12px; }
.action-grid h3 { display: inline; margin-left: 9px; font-size: 17px; }
.action-grid p { margin: 20px 0 0; color: var(--muted); font-size: 13px; }
.action-code { display: inline-grid; place-items: center; width: 34px; height: 34px; border-radius: 7px; font-weight: 900; }
.action-code.hit { color: var(--blue); background: color-mix(in srgb, var(--blue) 15%, transparent); }
.action-code.stand { color: var(--green); background: color-mix(in srgb, var(--green) 15%, transparent); }
.action-code.double { color: var(--amber); background: color-mix(in srgb, var(--amber) 15%, transparent); }
.action-code.split, .action-code.surrender { color: var(--red); background: color-mix(in srgb, var(--red) 15%, transparent); }
.betting-section { background: var(--surface); }
.betting-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 28px; }
.bankroll-form, .betting-result { padding: 28px; background: var(--bg); border: 1px solid var(--border); border-radius: 16px; }
.bankroll-form { display: grid; gap: 19px; }
.bankroll-form > label > span, .bankroll-form legend { display: block; margin-bottom: 7px; color: var(--muted); font-size: 12px; font-weight: 700; }
.money-input { display: flex; align-items: center; background: var(--surface-raised); border: 1px solid var(--border); border-radius: 9px; overflow: hidden; }
.money-input:focus-within { border-color: var(--green); box-shadow: 0 0 0 3px color-mix(in srgb, var(--green) 15%, transparent); }
.money-input input { min-width: 0; width: 100%; padding: 13px 14px; color: var(--text); background: transparent; border: 0; outline: 0; font: inherit; font-weight: 800; }
.money-input b { padding-left: 14px; color: var(--muted); font-size: 14px; }
.bankroll-form fieldset { padding: 0; border: 0; }
.risk-options { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; }
.risk-options label { cursor: pointer; }
.risk-options input { position: absolute; opacity: 0; }
.risk-options span { display: grid; place-items: center; padding: 11px 5px; background: var(--surface-raised); border: 1px solid var(--border); border-radius: 8px; font-size: 12px; font-weight: 800; }
.risk-options small { color: var(--muted); font-size: 9px; font-weight: 600; }
.risk-options input:checked + span { color: #071009; background: var(--green); border-color: var(--green); }
.risk-options input:checked + span small { color: #174325; }
.betting-result { display: flex; flex-direction: column; }
.recommended-bet { color: var(--green); font-size: clamp(40px, 6vw, 62px); line-height: 1.1; letter-spacing: -.04em; }
.recommended-bet.warning { color: var(--red); }
.betting-verdict { min-height: 48px; margin: 10px 0 22px; color: var(--muted); font-size: 13px; }
.betting-stats { display: grid; gap: 1px; overflow: hidden; background: var(--border); border: 1px solid var(--border); border-radius: 9px; }
.betting-stats div { display: flex; justify-content: space-between; padding: 12px 13px; background: var(--surface-raised); }
.betting-stats span { color: var(--muted); font-size: 11px; }
.betting-stats strong { font-size: 12px; }
.betting-warning { display: flex; gap: 10px; margin-top: 18px; padding: 14px; background: color-mix(in srgb, var(--amber) 10%, transparent); border-radius: 9px; }
.betting-warning > span { display: grid; place-items: center; width: 20px; height: 20px; flex: 0 0 auto; color: var(--bg); background: var(--amber); border-radius: 50%; font-size: 12px; font-weight: 900; }
.betting-warning p { margin: 0; color: var(--muted); font-size: 11px; }
.notice-section { display: flex; gap: 28px; max-width: 1180px; margin: 0 auto; padding: 30px 24px 80px; color: var(--muted); font-size: 13px; }
.notice-section strong { flex: 0 0 auto; color: var(--text); }
.notice-section p { margin: 0; }

footer { display: grid; place-items: center; padding: 50px 24px; border-top: 1px solid var(--border); color: var(--muted); text-align: center; }
.footer-brand { color: var(--text); }
footer p { margin: 12px 0 0; font-size: 13px; }
.copyright { opacity: .6; }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; min-height: auto; padding-top: 100px; }
  .hero-cards { display: none; }
  .calculator-grid { grid-template-columns: 1fr; }
  .result-panel { position: static; min-height: 440px; }
  .action-grid { grid-template-columns: repeat(2, 1fr); }
  .betting-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .site-header { height: 64px; }
  nav a { display: none; }
  .hero { padding: 72px 20px; }
  .hero-description { font-size: 16px; }
  .calculator-section, .guide-section, .betting-section { padding: 65px 16px; }
  .section-heading { display: block; }
  .rule-summary { margin-top: 12px; }
  .selection-step { padding: 22px 16px; }
  .hit-card-history, .hit-step .card-options { margin-left: 0; }
  .undo-hit-button { margin-left: 0; }
  .card-options { grid-template-columns: repeat(5, 1fr); }
  .card-option { aspect-ratio: 1.2; }
  .action-grid { grid-template-columns: 1fr; }
  .risk-options { grid-template-columns: 1fr; }
  .notice-section { display: block; padding: 25px 20px 60px; }
  .notice-section p { margin-top: 8px; }
}