:root {
  --ink: #1f2a44;
  --ink-soft: #2d3a56;
  --paper: #f4f1ea;
  --card: #ffffff;
  --line: #e2ddd1;
  --line-strong: #cfc9ba;
  --text: #37404f;
  --text-dim: #6b7280;
  --text-faint: #9aa0ab;
  --accent: #0f766e;
  --accent-deep: #0b5850;
  --accent-wash: #e3efec;
  --warn: #b5820a;
  --danger: #b23b3b;
  --subj-kor: #c0504d;
  --subj-math: #3f6fb0;
  --subj-soc: #c07d2e;
  --subj-sci: #4c8a52;
  --shadow: 0 1px 2px rgba(31,42,68,.05), 0 8px 24px rgba(31,42,68,.06);
  --shadow-lg: 0 4px 12px rgba(31,42,68,.08), 0 24px 60px rgba(31,42,68,.10);
  --font: 'Pretendard', 'Apple SD Gothic Neo', 'Noto Sans KR', system-ui, -apple-system, sans-serif;
  --mono: 'SFMono-Regular', ui-monospace, 'Menlo', 'Consolas', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 600px at 82% -12%, #f8f6f0 0%, rgba(248,246,240,0) 60%),
    var(--paper);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}
h1, h2, h3, h4 { text-wrap: balance; color: var(--ink); margin: 0; }
a { color: var(--accent-deep); }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 24px; }
.eyebrow { font-size: 12px; letter-spacing: .16em; text-transform: uppercase; font-weight: 700; color: var(--accent); }

/* ---- top bar ---- */
.topbar {
  border-bottom: 1px solid var(--line);
  background: rgba(244,241,234,.85);
  backdrop-filter: saturate(1.2) blur(8px);
  position: sticky; top: 0; z-index: 40;
}
.topbar .wrap { display: flex; align-items: center; justify-content: space-between; height: 62px; gap: 16px; }
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; color: var(--ink); }
.brand .mark {
  width: 32px; height: 32px; border-radius: 9px;
  background: linear-gradient(150deg, var(--ink) 0%, var(--accent-deep) 130%);
  display: grid; place-items: center; flex: none;
}
.brand .name { font-size: 16px; letter-spacing: -.01em; }
.brand .sub { font-size: 11px; color: var(--text-faint); font-weight: 600; }
.topbar .tag { font-size: 11.5px; font-weight: 700; color: var(--accent-deep); background: var(--accent-wash); border: 1px solid #cfe4df; padding: 4px 11px; border-radius: 999px; }

/* ---- hero ---- */
.hero { padding: 46px 0 26px; }
.hero h1 { font-size: 33px; line-height: 1.2; letter-spacing: -.02em; font-weight: 800; margin-top: 14px; }
.hero h1 em { font-style: normal; color: var(--accent-deep); }
.hero .lede { font-size: 16.5px; color: var(--text); margin: 16px 0 0; max-width: 60ch; }
.hero .lede b { color: var(--ink); font-weight: 700; }

/* ---- generic card ---- */
.panel { background: var(--card); border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow-lg); overflow: hidden; margin-bottom: 22px; }
.panel > .phead { padding: 18px 24px; border-bottom: 1px solid var(--line); background: linear-gradient(180deg, #fff, #fcfbf8); display: flex; align-items: center; gap: 12px; }
.panel > .phead .step-n { width: 26px; height: 26px; border-radius: 8px; background: var(--ink); color: #fff; display: grid; place-items: center; font-size: 13px; font-weight: 800; flex: none; }
.panel > .phead .pt { font-weight: 800; color: var(--ink); font-size: 16px; }
.panel > .phead .pt span { display: block; font-weight: 500; font-size: 12.5px; color: var(--text-dim); margin-top: 2px; }
.panel > .pbody { padding: 22px 24px; }

/* ---- fields ---- */
.grid { display: grid; gap: 16px 20px; }
.grid.c2 { grid-template-columns: 1fr 1fr; }
.grid.c3 { grid-template-columns: 1fr 1fr 1fr; }
.grid.c4 { grid-template-columns: repeat(4, 1fr); }
.field { display: flex; flex-direction: column; gap: 7px; }
.field.span { grid-column: 1 / -1; }
.field label { font-size: 13px; font-weight: 700; color: var(--ink-soft); }
.field label .opt { font-weight: 600; color: var(--text-faint); font-size: 11.5px; margin-left: 6px; }
.field input, .field textarea, .field select {
  font-family: inherit; font-size: 14.5px; color: var(--text);
  border: 1px solid var(--line-strong); border-radius: 9px; padding: 11px 13px;
  background: #fdfcfa; width: 100%; transition: border .12s, box-shadow .12s;
}
.field textarea { resize: vertical; min-height: 60px; line-height: 1.55; }
.field select { cursor: pointer; appearance: none; background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'><path d='M1 1l5 5 5-5' stroke='%236b7280' stroke-width='1.6' fill='none' stroke-linecap='round' stroke-linejoin='round'/></svg>"); background-repeat: no-repeat; background-position: right 13px center; padding-right: 34px; }
.field input:focus, .field textarea:focus, .field select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px rgba(15,118,110,.13); background: #fff; }
.field select:disabled { background-color: #f2f0ea; color: var(--text-faint); cursor: not-allowed; }
.field .hint { font-size: 11.5px; color: var(--text-faint); }

/* achievement standard checklist */
.std-picker { display: flex; flex-direction: column; gap: 9px; }
.std-opt { display: flex; gap: 11px; align-items: flex-start; border: 1px solid var(--line-strong); border-radius: 10px; padding: 11px 13px; background: #fdfcfa; cursor: pointer; transition: border .12s, background .12s; }
.std-opt:hover { border-color: var(--accent); }
.std-opt.on { border-color: var(--accent); background: var(--accent-wash); }
.std-opt input { margin-top: 3px; accent-color: var(--accent); width: 16px; height: 16px; flex: none; }
.std-opt .so-code { font-weight: 800; color: var(--accent-deep); font-size: 13px; white-space: nowrap; }
.std-opt .so-text { font-size: 13.5px; color: var(--text); }
.std-empty { font-size: 13px; color: var(--text-faint); padding: 10px 2px; }

/* editable standards list */
.std-edit { display: flex; flex-direction: column; gap: 9px; }
.std-row { display: grid; grid-template-columns: 130px 1fr auto; gap: 9px; align-items: start; }
.std-row input.code { font-weight: 700; color: var(--accent-deep); text-align: center; }
.std-row .rm { font-family: inherit; border: 1px solid var(--line-strong); background: #fff; color: var(--text-faint); border-radius: 8px; width: 38px; cursor: pointer; font-size: 16px; align-self: stretch; }
.std-row .rm:hover { border-color: var(--danger); color: var(--danger); }
.add-btn { align-self: flex-start; font-family: inherit; font-size: 13px; font-weight: 700; color: var(--accent-deep); background: none; border: 1px dashed var(--line-strong); border-radius: 8px; padding: 8px 14px; cursor: pointer; }
.add-btn:hover { border-color: var(--accent); background: var(--accent-wash); }

/* toggle */
.toggle-line { display: inline-flex; align-items: center; gap: 10px; font-size: 13px; color: var(--text-dim); }
.switch { position: relative; width: 40px; height: 23px; flex: none; }
.switch input { position: absolute; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.switch .track { position: absolute; inset: 0; background: var(--line-strong); border-radius: 999px; transition: background .16s; }
.switch .thumb { position: absolute; top: 3px; left: 3px; width: 17px; height: 17px; background: #fff; border-radius: 50%; transition: transform .16s; box-shadow: 0 1px 3px rgba(0,0,0,.25); }
.switch input:checked + .track { background: var(--accent); }
.switch input:checked + .track + .thumb { transform: translateX(17px); }
.switch input:focus-visible + .track { outline: 3px solid #9fd4cc; outline-offset: 2px; }

/* subject dot in select-ish */
.subj-badge { display: inline-flex; align-items: center; gap: 6px; font-weight: 700; }
.subj-badge .d { width: 9px; height: 9px; border-radius: 50%; }

/* ---- buttons ---- */
.btn { font-family: inherit; font-size: 15px; font-weight: 700; cursor: pointer; border-radius: 10px; padding: 12px 20px; border: 1px solid transparent; transition: transform .12s, box-shadow .12s, background .12s, border-color .12s; }
.btn:focus-visible { outline: 3px solid #9fd4cc; outline-offset: 2px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 2px 10px rgba(15,118,110,.28); }
.btn-primary:hover:not(:disabled) { background: var(--accent-deep); transform: translateY(-1px); }
.btn-ghost { background: #fff; color: var(--ink); border-color: var(--line-strong); }
.btn-ghost:hover:not(:disabled) { border-color: var(--accent); color: var(--accent-deep); }
.btn-lg { font-size: 16px; padding: 14px 26px; }

/* ---- mode tabs ---- */
.modes { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 18px; }
.mode { text-align: left; border: 1.5px solid var(--line-strong); border-radius: 12px; padding: 14px 15px; background: #fdfcfa; cursor: pointer; font-family: inherit; transition: border .12s, background .12s, box-shadow .12s; }
.mode:hover { border-color: var(--accent); }
.mode.on { border-color: var(--accent); background: var(--accent-wash); box-shadow: 0 0 0 3px rgba(15,118,110,.1); }
.mode .m-t { font-weight: 800; color: var(--ink); font-size: 14.5px; display: flex; align-items: center; gap: 7px; }
.mode .m-badge { font-size: 10px; font-weight: 800; letter-spacing: .04em; text-transform: uppercase; padding: 2px 7px; border-radius: 5px; }
.mode .m-badge.free { background: #e4f2e6; color: #3d7a46; }
.mode .m-badge.key { background: #eef2f9; color: #3f5b8f; }
.mode .m-badge.copy { background: #f7efe2; color: #97701f; }
.mode .m-s { font-size: 12px; color: var(--text-dim); margin-top: 5px; line-height: 1.45; }

.mode-body { display: none; }
.mode-body.on { display: block; }

/* api key box */
.keybox { background: #fbfaf7; border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; margin-bottom: 16px; }
.keybox .kb-row { display: grid; grid-template-columns: 160px 1fr auto; gap: 10px; align-items: center; }
.keybox .kb-note { font-size: 12px; color: var(--text-dim); margin-top: 10px; line-height: 1.5; }
.keybox .kb-note b { color: var(--ink); }
.keybox .saved { font-size: 12px; font-weight: 700; color: var(--accent-deep); }
.provider-links { font-size: 12px; color: var(--text-dim); margin-top: 6px; }

.copy-links { display: flex; gap: 9px; flex-wrap: wrap; align-items: center; margin-top: 14px; }
.mini-btn { font-family: inherit; font-size: 13.5px; font-weight: 700; border-radius: 9px; padding: 10px 15px; cursor: pointer; border: 1px solid var(--line-strong); background: #fff; color: var(--ink); text-decoration: none; display: inline-flex; align-items: center; gap: 7px; }
.mini-btn:hover { border-color: var(--accent); color: var(--accent-deep); }
.mini-btn.solid { background: var(--accent); color: #fff; border-color: var(--accent); }
.mini-btn.solid.done { background: #5f8a4e; border-color: #5f8a4e; }
.mini-tip { font-size: 12px; color: var(--text-faint); }

/* ---- generate bar ---- */
.gen-bar { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; padding-top: 4px; }
.gen-bar .gb-note { font-size: 12.5px; color: var(--text-dim); max-width: 46ch; }

/* status line */
.status { display: none; margin-top: 16px; align-items: center; gap: 11px; font-size: 14px; color: var(--ink-soft); font-weight: 600; background: #fbfaf7; border: 1px solid var(--line); border-radius: 10px; padding: 13px 16px; }
.status.on { display: flex; }
.status.err { color: var(--danger); background: #fbeaea; border-color: #f2cccc; font-weight: 500; }
.spinner { width: 17px; height: 17px; border-radius: 50%; border: 2.5px solid var(--accent-wash); border-top-color: var(--accent); animation: spin .8s linear infinite; flex: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---- result ---- */
.result { display: none; }
.result.on { display: block; }
.result .rhead { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.result .rhead .rt { font-weight: 800; color: var(--ink); font-size: 18px; }
.result .rhead .racts { display: flex; gap: 9px; flex-wrap: wrap; }
.render {
  background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow);
  padding: 26px 30px; font-size: 15px; line-height: 1.75; color: var(--text);
}
.render h1, .render h2, .render h3 { line-height: 1.3; margin: 1.4em 0 .5em; }
.render h1 { font-size: 23px; } .render h2 { font-size: 20px; } .render h3 { font-size: 17px; }
.render h1:first-child, .render h2:first-child, .render h3:first-child { margin-top: 0; }
.render p { margin: .6em 0; }
.render ul, .render ol { margin: .6em 0; padding-left: 1.4em; }
.render li { margin: .3em 0; }
.render strong { color: var(--ink); }
.render code { font-family: var(--mono); font-size: .9em; background: #f2f0ea; padding: 1px 5px; border-radius: 4px; }
.render pre { background: #1f2a44; color: #e7edf6; padding: 14px 16px; border-radius: 10px; overflow-x: auto; }
.render pre code { background: none; color: inherit; padding: 0; }
.render blockquote { border-left: 3px solid var(--accent); margin: .8em 0; padding: 2px 0 2px 16px; color: var(--text-dim); }
.render table { border-collapse: collapse; width: 100%; margin: 1em 0; font-size: 14px; }
.render th, .render td { border: 1px solid var(--line); padding: 8px 11px; text-align: left; }
.render th { background: #f6f4ef; font-weight: 700; color: var(--ink); }
.render hr { border: none; border-top: 1px solid var(--line); margin: 1.4em 0; }

/* prompt preview (copy mode) */
.prompt-box { background: rgba(9,15,30,.92); border-radius: 12px; padding: 16px 18px; max-height: 320px; overflow: auto; }
.prompt-box pre { margin: 0; font-family: var(--mono); font-size: 12.5px; line-height: 1.62; color: #e7edf6; white-space: pre-wrap; word-break: break-word; }

/* footer */
footer.site { border-top: 1px solid var(--line); margin-top: 40px; padding: 26px 0 48px; }
footer.site .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer.site .fnote { font-size: 13px; color: var(--text-dim); }
footer.site .fnote b { color: var(--ink); }
footer.site .fbrand { font-size: 12.5px; color: var(--text-faint); display: inline-flex; align-items: center; gap: 8px; }
footer.site .fbrand .fava { width: 26px; height: 26px; border-radius: 50%; object-fit: cover; background: #eceae2; }

/* toast */
.toast { position: fixed; left: 50%; bottom: 28px; transform: translateX(-50%) translateY(20px); background: var(--ink); color: #fff; font-size: 14px; font-weight: 600; padding: 12px 20px; border-radius: 10px; box-shadow: var(--shadow-lg); opacity: 0; pointer-events: none; transition: opacity .2s, transform .2s; z-index: 100; }
.toast.on { opacity: 1; transform: translateX(-50%) translateY(0); }

/* responsive */
@media (max-width: 860px) {
  .hero h1 { font-size: 27px; }
  .grid.c2, .grid.c3, .grid.c4 { grid-template-columns: 1fr; }
  .modes { grid-template-columns: 1fr; }
  .keybox .kb-row { grid-template-columns: 1fr; }
  .std-row { grid-template-columns: 100px 1fr auto; }
  .render { padding: 20px 18px; }
}
@media (max-width: 480px) {
  .wrap { padding: 0 16px; }
  .topbar .tag { display: none; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .spinner { animation: none; }
  * { transition: none !important; }
}