:root {
  --bg: #f6f7fb;
  --surface: #ffffff;
  --surface-2: #f0f2f8;
  --text: #1c2033;
  --muted: #6b7189;
  --border: #e1e4ee;
  --primary: #4f46e5;
  --primary-2: #0ea5e9;
  --primary-soft: #eef0ff;
  --accent: #f59e0b;
  --key: #ffffff;
  --key-shadow: #c9cde0;
  --key-special: #e6e9f3;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(20, 24, 50, .06), 0 4px 16px rgba(20, 24, 50, .06);
  --font: system-ui, -apple-system, 'Apple SD Gothic Neo', 'Noto Sans KR', 'Segoe UI', 'Noto Sans', sans-serif;
  color-scheme: light;
}

[data-theme='dark'] {
  --bg: #0f1220;
  --surface: #171b2e;
  --surface-2: #1f2440;
  --text: #e7e9f5;
  --muted: #9aa0bd;
  --border: #2a3050;
  --primary: #818cf8;
  --primary-2: #38bdf8;
  --primary-soft: #232a4d;
  --key: #262c4a;
  --key-shadow: #0b0e1a;
  --key-special: #1d2240;
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 4px 16px rgba(0, 0, 0, .25);
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
h1, h2, h3 { line-height: 1.25; }
.wrap { width: 100%; max-width: 1080px; margin: 0 auto; padding: 0 20px; }
main.wrap { flex: 1; padding-top: 28px; padding-bottom: 56px; }
.muted { color: var(--muted); }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--surface) 85%, transparent);
  backdrop-filter: saturate(1.6) blur(10px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; gap: 20px; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 20px; color: var(--text); letter-spacing: -.02em; }
.logo:hover { text-decoration: none; }
.logo-mark {
  display: grid; place-items: center; width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; font-size: 17px;
  box-shadow: 0 3px 0 rgba(0, 0, 0, .15);
}
.nav { display: flex; gap: 4px; margin-left: auto; }
.nav details { position: relative; }
.nav summary {
  list-style: none; cursor: pointer; padding: 8px 14px; border-radius: 8px; font-weight: 600; user-select: none;
}
.nav summary::-webkit-details-marker { display: none; }
.nav summary::after { content: ' ▾'; font-size: 11px; color: var(--muted); }
.nav summary:hover, .nav details[open] summary { background: var(--surface-2); }
.menu {
  position: absolute; right: 0; top: calc(100% + 6px); min-width: 230px; padding: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  display: flex; flex-direction: column;
}
.menu-grid { display: grid; grid-template-columns: repeat(3, minmax(150px, 1fr)); min-width: 500px; max-height: 70vh; overflow-y: auto; }
.menu a { display: flex; align-items: center; gap: 10px; padding: 7px 10px; border-radius: 8px; color: var(--text); }
.menu a:hover { background: var(--primary-soft); text-decoration: none; }
.menu-sample { width: 26px; text-align: center; font-size: 17px; color: var(--primary); }
.icon-btn {
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  width: 38px; height: 38px; border-radius: 10px; cursor: pointer; font-size: 17px;
}

/* ---------- common ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  padding: 8px 14px; border-radius: 9px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font: inherit; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: background .15s, border-color .15s; white-space: nowrap;
}
.btn:hover { background: var(--surface-2); text-decoration: none; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.small { padding: 5px 10px; font-size: 13px; }
.btns { display: flex; gap: 8px; margin-top: 10px; align-items: center; flex-wrap: wrap; }
.err { color: #e11d48; font-size: 13px; }
.note { color: var(--muted); font-size: 14px; }
.crumb { margin: 0 0 4px; font-size: 13px; color: var(--muted); }
.sub { margin: 4px 0 0; color: var(--muted); }
.page-title { display: flex; align-items: center; gap: 12px; margin: 0 0 6px; font-size: 30px; letter-spacing: -.02em; }
.sec-title { font-size: 22px; margin: 44px 0 16px; letter-spacing: -.01em; }
.sec-title small { font-size: 14px; color: var(--muted); font-weight: 500; margin-left: 6px; }

textarea, input[type='text'], input[type='search'], input[type='number'], select {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--border); border-radius: 10px; padding: 10px 12px; width: 100%;
}
textarea:focus, input:focus, select:focus { outline: 2px solid color-mix(in srgb, var(--primary) 45%, transparent); outline-offset: 0; border-color: var(--primary); }
textarea { resize: vertical; }
input[type='color'] { width: 100%; height: 40px; border: 1px solid var(--border); border-radius: 10px; background: var(--surface); padding: 3px; }
.check { display: inline-flex; align-items: center; gap: 7px; cursor: pointer; font-size: 14px; user-select: none; }
.check input { width: 16px; height: 16px; accent-color: var(--primary); }
.mono { font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 14px; }
.big-text { font-size: 22px; }
.input-lg { font-size: 20px; padding: 14px 16px; }

.panel { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.panel > label { display: block; font-weight: 700; font-size: 14px; margin-bottom: 8px; }
.panel select + textarea { margin-top: 10px; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 18px; }

/* ---------- home ---------- */
.hero { text-align: center; padding: 36px 0 8px; }
.hero h1 { font-size: clamp(30px, 5vw, 48px); margin: 0 0 16px; letter-spacing: -.03em; }
.grad { background: linear-gradient(90deg, var(--primary), var(--primary-2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { max-width: 640px; margin: 0 auto; color: var(--muted); font-size: 17px; }
.hero-samples { margin: 22px auto 0; color: var(--muted); opacity: .75; font-size: 15px; max-width: 760px; }
.search-wrap { max-width: 460px; margin: 26px auto 0; }
.search-wrap input { padding: 13px 18px; border-radius: 999px; font-size: 16px; box-shadow: var(--shadow); }

.lang-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.lang-card, .tool-card {
  display: flex; align-items: center; gap: 14px; padding: 14px 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); transition: transform .15s, border-color .15s, box-shadow .15s;
}
.lang-card:hover, .tool-card:hover { transform: translateY(-2px); border-color: var(--primary); box-shadow: var(--shadow); text-decoration: none; }
.lang-sample {
  flex: none; display: grid; place-items: center; width: 46px; height: 46px; border-radius: 11px;
  background: var(--primary-soft); color: var(--primary); font-size: 24px; font-weight: 700;
}
.lang-text, .tool-card > span:last-child { display: flex; flex-direction: column; min-width: 0; }
.lang-text b { font-size: 16px; }
.lang-text small, .tool-card small { color: var(--muted); font-size: 13px; line-height: 1.4; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }
.tool-card { align-items: flex-start; }
.tool-icon {
  flex: none; display: inline-grid; place-items: center; width: 46px; height: 46px; border-radius: 11px;
  background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; font-size: 20px; font-weight: 700;
}

.faq details {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 4px 18px; margin-bottom: 10px;
}
.faq summary { cursor: pointer; font-weight: 700; padding: 12px 0; }
.faq p, .faq ul { margin: 0 0 14px; color: var(--muted); }

/* ---------- keyboard page ---------- */
.kb-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; flex-wrap: wrap; }
.kb-head h1 { margin: 0; font-size: 32px; letter-spacing: -.02em; }
.kb-head h1 small { font-size: 16px; color: var(--muted); font-weight: 500; }
.kb-head select { width: auto; min-width: 220px; }
.toolbar { display: flex; justify-content: space-between; gap: 10px; flex-wrap: wrap; margin: 18px 0 10px; }
.tb-group { display: flex; gap: 6px; flex-wrap: wrap; }
#editor { min-height: 170px; line-height: 1.5; border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow); }
.status-bar { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); padding: 6px 4px; min-height: 30px; }
#kbStatus { color: var(--primary); font-weight: 600; }
.options { display: flex; gap: 20px; flex-wrap: wrap; margin: 4px 0 12px; }

.keyboard {
  background: var(--surface-2); border: 1px solid var(--border); border-radius: 16px;
  padding: 10px; display: flex; flex-direction: column; gap: 6px;
  user-select: none; -webkit-user-select: none; touch-action: manipulation; direction: ltr;
}
.kb-row { display: flex; gap: 6px; }
.key {
  flex: 10 1 0; min-width: 0; height: 58px; position: relative;
  border: 1px solid var(--border); border-radius: 9px; background: var(--key); color: var(--text);
  box-shadow: 0 2px 0 var(--key-shadow); cursor: pointer; padding: 0; font: inherit;
  transition: transform .06s, box-shadow .06s, background .1s;
}
.key:hover { background: color-mix(in srgb, var(--key) 85%, var(--primary)); }
.key.active { transform: translateY(2px); box-shadow: 0 0 0 var(--key-shadow); background: var(--primary-soft); }
.key .k-main { position: absolute; inset: 0; display: grid; place-items: center; font-size: 21px; line-height: 1; }
.key .k-alt { position: absolute; top: 4px; left: 6px; font-size: 12px; color: var(--muted); line-height: 1; }
.key .k-hint { position: absolute; top: 0; bottom: 0; right: 0; width: 50%; display: grid; place-items: center; font-size: 21px; color: var(--muted); line-height: 1; }
.key.has-hint .k-main { right: 50%; }
.key .k-agr { position: absolute; bottom: 4px; left: 6px; font-size: 11px; color: var(--accent); line-height: 1; }
.key.dead { border-color: var(--accent); }
.key.on { background: var(--primary); color: #fff; border-color: var(--primary); }
.key.on .k-alt, .key.on .k-hint, .key.on .k-agr { color: rgba(255, 255, 255, .8); }
.key.special { background: var(--key-special); font-size: 13px; font-weight: 600; color: var(--muted); }
.key.special.on { background: var(--primary); color: #fff; }
.key.w10 { flex-grow: 10; } .key.w13 { flex-grow: 13; } .key.w15 { flex-grow: 15; } .key.w18 { flex-grow: 18; } .key.w20 { flex-grow: 20; }
.key.w22 { flex-grow: 22; } .key.w23 { flex-grow: 23; } .key.w27 { flex-grow: 27; } .key.space { flex-grow: 95; }

.kb-help { margin-top: 26px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 4px 22px 10px; }
.kb-help h3 { font-size: 16px; }
.kb-help li { color: var(--muted); font-size: 14px; margin-bottom: 4px; }

/* ---------- tools ---------- */
.tool-page .page-title .tool-icon { width: 44px; height: 44px; }
.braille { font-size: 26px; letter-spacing: 2px; }
.braille-chart { display: grid; grid-template-columns: repeat(auto-fill, minmax(56px, 1fr)); gap: 6px; margin-top: 16px; }
.braille-chart div { display: flex; flex-direction: column; align-items: center; background: var(--surface); border: 1px solid var(--border); border-radius: 8px; padding: 6px 0; }
.braille-chart b { font-size: 13px; color: var(--muted); }

.char-breakdown table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; font-size: 14px; margin-top: 8px; }
.char-breakdown th, .char-breakdown td { padding: 8px 12px; border-bottom: 1px solid var(--border); text-align: left; font-family: ui-monospace, Menlo, monospace; }
.char-breakdown th { background: var(--surface-2); font-family: var(--font); }
.char-breakdown td.big { font-size: 22px; font-family: var(--font); }

.variants { display: flex; flex-direction: column; gap: 8px; margin-top: 14px; }
.panel .variants { margin-top: 0; }
.variant { display: flex; align-items: center; gap: 14px; background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 10px 14px; }
.vname { flex: none; width: 140px; font-size: 13px; color: var(--muted); font-weight: 600; }
.vtext { flex: 1; font-size: 20px; overflow-wrap: anywhere; }

.ti-grid { display: grid; grid-template-columns: minmax(300px, 420px) 1fr; gap: 16px; margin-top: 18px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.form-grid > label { display: flex; flex-direction: column; gap: 4px; font-size: 13px; font-weight: 600; color: var(--muted); }
.form-grid > label.check { flex-direction: row; align-self: end; padding-bottom: 10px; }
.form-grid input, .form-grid select { padding: 8px 10px; }
.preview-panel { display: flex; flex-direction: column; }
.checker {
  flex: 1; display: grid; place-items: center; padding: 16px; border-radius: 10px; overflow: auto; min-height: 240px;
  background: repeating-conic-gradient(#e5e7eb 0 25%, #f9fafb 0 50%) 0 0 / 20px 20px;
}
.checker canvas { max-width: 100%; height: auto; box-shadow: 0 2px 10px rgba(0, 0, 0, .12); }

.ut-bar { display: flex; gap: 10px; margin-top: 18px; flex-wrap: wrap; align-items: center; }
.ut-bar select { flex: 2 1 280px; width: auto; }
.ut-bar input { flex: 1 1 180px; width: auto; }
.pager { display: flex; align-items: center; gap: 8px; font-size: 14px; color: var(--muted); }
.scratch { margin-top: 12px; }
.scratch-row { display: flex; gap: 8px; align-items: stretch; }
.scratch-row textarea { font-size: 22px; }
.ut-info { margin-top: 8px; font-size: 14px; color: var(--muted); min-height: 30px; }
.ut-info .big { font-size: 22px; color: var(--text); margin-right: 8px; }
.ut-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(48px, 1fr)); gap: 4px; margin-top: 14px; }
.uc {
  aspect-ratio: 1; border: 1px solid var(--border); background: var(--surface); color: var(--text);
  border-radius: 8px; font-size: 22px; cursor: pointer; padding: 0; font-family: var(--font);
}
.uc:hover, .uc.hl { background: var(--primary); color: #fff; border-color: var(--primary); }

.empty { text-align: center; padding: 80px 0; }

/* ---------- about sections on keyboard and tool pages ---------- */
.about { margin-top: 8px; margin-bottom: 48px; }
.about h2 { font-size: 22px; margin: 36px 0 10px; }
.about h3 { font-size: 16px; margin: 20px 0 4px; }
.about p, .about li { line-height: 1.7; max-width: 760px; }
.keymap { display: grid; grid-template-columns: repeat(auto-fill, minmax(86px, 1fr)); gap: 6px; margin-top: 12px; }
.km { display: flex; align-items: center; gap: 8px; padding: 6px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--surface); }
.km kbd { min-width: 22px; padding: 1px 5px; border-radius: 4px; background: var(--surface-2); font: 600 12px/1.6 var(--font); color: var(--muted); text-align: center; }
.km-n { font-size: 20px; }
.km-s { font-size: 14px; color: var(--muted); }
.link-grid { display: flex; flex-wrap: wrap; gap: 6px 8px; }
.link-grid a { padding: 6px 12px; border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--text); font-size: 14px; }
.link-grid a:hover { border-color: var(--primary); text-decoration: none; }

/* ---------- ads ---------- */
.ad-slot { margin: 36px 0; text-align: center; }
.ad-label { display: block; margin-bottom: 6px; font-size: 11px; letter-spacing: .08em; text-transform: uppercase; color: var(--muted); }
.ad-slot ins.adsbygoogle { min-height: 100px; }
.ad-slot:has(ins[data-ad-status="unfilled"]) { display: none; }
.ad-preview { display: grid; place-items: center; height: 250px; border: 2px dashed var(--border); border-radius: 12px; color: var(--muted); font-weight: 600; }

/* ---------- footer ---------- */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); padding: 22px 0; font-size: 14px; }
.site-footer p { margin: 2px 0; }
.footer-links a { color: var(--muted); }
.footer-links a.privacy-link { color: var(--text); font-weight: 700; }

/* ---------- static pages (privacy, terms, contact) ---------- */
.nav-links a { padding: 8px 14px; border-radius: 8px; font-weight: 600; color: var(--text); }
.nav-links a:hover { background: var(--surface-2); text-decoration: none; }
.legal { max-width: 760px; }
.legal h1 { font-size: 32px; margin: 0 0 6px; letter-spacing: -.02em; }
.legal h2 { font-size: 19px; margin: 32px 0 8px; }
.legal p, .legal li { line-height: 1.7; }
.legal li { margin-bottom: 4px; }
.legal .updated { color: var(--muted); font-size: 14px; margin-top: 0; }
.contact-email { font-size: 22px; font-weight: 700; }
.legal h3 { font-size: 16px; margin: 22px 0 6px; }
.legal .summary { background: var(--surface-2); border: 1px solid var(--border); border-radius: 12px; padding: 4px 20px; margin: 18px 0 24px; }
.table-wrap { overflow-x: auto; margin: 10px 0; }
.legal table { border-collapse: collapse; width: 100%; font-size: 14px; line-height: 1.55; }
.legal th, .legal td { border: 1px solid var(--border); padding: 8px 10px; text-align: left; vertical-align: top; word-break: keep-all; overflow-wrap: anywhere; }
.legal th { background: var(--surface-2); font-weight: 700; }
.legal td { min-width: 110px; }
mark.todo { background: #fde047; color: #1f2937; padding: 0 3px; border-radius: 3px; }

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .two-col, .ti-grid { grid-template-columns: 1fr; }
  .menu-grid { grid-template-columns: 1fr; min-width: 220px; max-height: 70vh; overflow: auto; }
  .keyboard { padding: 5px; gap: 4px; border-radius: 10px; margin: 0 -12px; }
  .kb-row { gap: 3px; }
  .key { height: 46px; border-radius: 6px; }
  .key .k-main { font-size: 17px; }
  .key .k-alt { font-size: 9px; top: 2px; left: 3px; }
  .key .k-hint { display: none; }
  .key.has-hint .k-main { right: 0; }
  .key .k-agr { font-size: 9px; bottom: 2px; left: 3px; }
  .header-inner { gap: 10px; }
  .nav summary, .nav-links a { padding: 8px 10px; }
  .menu { position: fixed; top: 64px; left: 12px; right: 12px; min-width: 0; max-height: 70vh; overflow-y: auto; }
  .menu-grid { min-width: 0; grid-template-columns: repeat(2, minmax(0, 1fr)); overflow-x: hidden; }
  .key.special { font-size: 10px; }
  .vname { width: 90px; }
  .kb-head select { width: 100%; }
}
@media (max-width: 420px) {
  .logo-text { display: none; }
}