:root {
  --ink: #1f2a37;
  --soft: #5b6675;
  --line: #d9dee5;
  --paper: #ffffff;
  --ground: #f4f1ec;
  --brand: #b8432f;
  --brand-dark: #93321f;
  --ok: #1f7a4d;
  --warn-bg: #fdecea;
  --warn: #a12a1c;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--ground);
  color: var(--ink);
  font-family: "Hiragino Sans", "Noto Sans JP", "Apple SD Gothic Neo", "Noto Sans KR", "Yu Gothic", Meiryo, sans-serif;
  font-size: 16px;
  line-height: 1.7;
}
a { color: var(--brand-dark); }
h1 { font-size: 1.5rem; line-height: 1.35; margin: 0 0 .5rem; }
h1 small { font-size: .85rem; font-weight: normal; color: var(--soft); margin-left: .4rem; }
h2 { font-size: 1.05rem; margin: 0 0 .75rem; }
.muted, .note { color: var(--soft); font-size: .875rem; }

/* 공개 폼 */
.sheet {
  max-width: 560px;
  margin: 0 auto;
  padding: 2rem 1rem 3rem;
}
.eyebrow { margin: 0 0 .25rem; color: var(--brand-dark); font-weight: 600; font-size: .9rem; letter-spacing: .04em; }
.lead { margin: 0 0 1.5rem; color: var(--soft); }
.tel { font-size: 1.25rem; font-weight: 600; }
.sheet form, .card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem;
}
.field { margin: 0 0 1.1rem; border: 0; padding: 0; min-width: 0; }
.field label, .field legend { display: block; font-weight: 600; font-size: .95rem; margin-bottom: .3rem; padding: 0; }
.req { font-size: .7rem; font-weight: 600; color: var(--brand-dark); border: 1px solid currentColor; border-radius: 4px; padding: 0 .35rem; margin-left: .35rem; vertical-align: middle; }
input[type=text], input[type=email], input[type=tel], input[type=password], input[type=datetime-local], select, textarea {
  width: 100%;
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1px solid #b9c0ca;
  border-radius: 8px;
  padding: .65rem .75rem;
  min-height: 46px;
}
input:focus, select:focus, textarea:focus, .btn:focus-visible, a:focus-visible {
  outline: 3px solid rgba(184, 67, 47, .35);
  outline-offset: 1px;
  border-color: var(--brand);
}
.choices { display: grid; gap: .5rem; }
.choice {
  display: flex !important; align-items: center; gap: .6rem;
  font-weight: normal !important; margin: 0 !important;
  border: 1px solid var(--line); border-radius: 8px; padding: .6rem .75rem; min-height: 46px; cursor: pointer;
}
.choice:has(input:checked) { border-color: var(--brand); background: #fbf1ee; }
.choice input { width: 1.1rem; height: 1.1rem; accent-color: var(--brand); }
.err { color: var(--warn); font-size: .875rem; margin: .3rem 0 0; }
.alert { background: var(--warn-bg); color: var(--warn); border-radius: 8px; padding: .6rem .8rem; margin: 0 0 1rem; }
.ok { background: #e6f4ec; color: var(--ok); border-radius: 8px; padding: .6rem .8rem; margin: 0 0 1rem; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
.btn {
  display: inline-block; width: 100%;
  font: inherit; font-weight: 600; text-align: center; text-decoration: none;
  color: #fff; background: var(--brand);
  border: 1px solid var(--brand); border-radius: 8px;
  padding: .8rem 1rem; min-height: 48px; cursor: pointer;
}
.btn:hover { background: var(--brand-dark); }
.btn.ghost { background: transparent; color: var(--brand-dark); }
.btn.ghost:hover { background: #fbf1ee; }
.btn.small { width: auto; min-height: 0; padding: .4rem .8rem; font-size: .875rem; }
.sheet .note { margin: .75rem 0 0; text-align: center; }

/* 관리 화면 */
.bar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  background: var(--ink); color: #fff; padding: .6rem 1rem;
}
.bar a { color: #fff; text-decoration: none; }
.bar .brand { font-weight: 600; }
.bar nav { display: flex; align-items: center; gap: 1rem; font-size: .9rem; }
.bar .who { opacity: .7; }
.bar form { margin: 0; }
.link { background: none; border: 0; color: #fff; font: inherit; text-decoration: underline; cursor: pointer; padding: 0; }
.wrap { max-width: 900px; margin: 0 auto; padding: 1.25rem 1rem 3rem; }
.narrow { max-width: 420px; margin: 2rem auto; }
.head { display: flex; align-items: center; justify-content: space-between; gap: 1rem; margin-bottom: .75rem; }
.head h1 { margin: 0; }
.tabs { display: flex; gap: .4rem; flex-wrap: wrap; margin-bottom: 1rem; }
.tabs a {
  text-decoration: none; color: var(--ink); font-size: .875rem;
  border: 1px solid var(--line); background: var(--paper); border-radius: 999px; padding: .25rem .8rem;
}
.tabs a.on { background: var(--ink); border-color: var(--ink); color: #fff; }
.rows { list-style: none; margin: 0; padding: 0; background: var(--paper); border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
.rows li + li { border-top: 1px solid var(--line); }
.rows a { display: flex; align-items: center; gap: .75rem; padding: .75rem 1rem; text-decoration: none; color: inherit; }
.rows a:hover { background: #faf8f5; }
.rows .main { flex: 1; min-width: 0; }
.rows small { color: var(--soft); margin-left: .35rem; }
.rows .sub { display: block; color: var(--soft); font-size: .875rem; overflow-wrap: anywhere; }
.rows time { color: var(--soft); font-size: .875rem; white-space: nowrap; }
.badge { flex: none; font-size: .75rem; font-weight: 600; border-radius: 999px; padding: .15rem .6rem; white-space: nowrap; }
.s-pending { background: #fdecc8; color: #7a4a00; }
.s-confirmed { background: #d9e8fb; color: #154a8a; }
.s-enrolled { background: #d8f0e1; color: #17603b; }
.s-closed { background: #e6e8eb; color: #4b5563; }
.empty { color: var(--soft); background: var(--paper); border: 1px dashed var(--line); border-radius: 12px; padding: 1.5rem; text-align: center; }
.cols { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
dl { margin: 0; display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: .4rem .75rem; }
dt { color: var(--soft); font-size: .875rem; }
dd { margin: 0; overflow-wrap: anywhere; }

/* ===== 2단계: 학생·수업 화면 ===== */
.wrap { max-width: 1040px; }
.bar nav { flex-wrap: wrap; gap: .25rem 1rem; }
.bar nav a { padding: .2rem 0; opacity: .8; }
.bar nav a.on { opacity: 1; font-weight: 600; border-bottom: 2px solid #fff; }
.btn.auto { width: auto; margin-right: .5rem; }
.card { margin-bottom: 1rem; }
.card .head h2 { margin: 0; }
.card h2 small, h2 small { font-weight: normal; font-size: .8rem; color: var(--soft); margin-left: .4rem; }
.form h2 { margin-top: 1.25rem; padding-top: 1rem; border-top: 1px solid var(--line); }
.form h2:first-of-type { margin-top: 0; padding-top: 0; border-top: 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 0 1rem; }
.grid .wide { grid-column: 1 / -1; }
.field label small { font-weight: normal; color: var(--soft); }
.field .muted { margin: .25rem 0 0; }
.field.check label { display: flex; align-items: center; gap: .5rem; min-height: 46px; }
.field.check input { width: 1.15rem; height: 1.15rem; accent-color: var(--brand); }
input[type=date], input[type=time], input[type=number], input[type=search] {
  width: 100%; font: inherit; color: inherit; background: #fff; border: 1px solid #b9c0ca; border-radius: 8px; padding: .65rem .75rem; min-height: 46px;
}
.tabs { align-items: center; }
.tabs .inline { display: flex; gap: .4rem; align-items: center; margin-left: auto; flex-wrap: wrap; }
.tabs .inline input, .tabs .inline select { width: auto; min-height: 36px; padding: .3rem .5rem; }
.summary { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem 1rem; margin: 0 0 1rem; color: var(--soft); }
.remain { flex: none; font-size: .85rem; font-weight: 600; border-radius: 999px; padding: .15rem .7rem; white-space: nowrap; }
.remain small { font-weight: normal; margin: 0 !important; color: inherit !important; opacity: .75; }
.r-ok { background: #e6f4ec; color: #17603b; }
.r-low { background: #fdecc8; color: #7a4a00; }
.r-zero { background: var(--warn-bg); color: var(--warn); }
.st-active, .l-done { background: #d8f0e1; color: #17603b; }
.st-paused, .l-reserved { background: #d9e8fb; color: #154a8a; }
.st-ended, .l-canceled { background: #e6e8eb; color: #4b5563; }
.l-absent, .l-mixed { background: #fdecc8; color: #7a4a00; }
.rows .clock { font-weight: 600; color: var(--ink); font-size: 1.05rem; min-width: 3.2rem; }
.quick { display: flex; flex-wrap: wrap; align-items: end; gap: .6rem; background: #faf8f5; border: 1px solid var(--line); border-radius: 10px; padding: .75rem; margin: .75rem 0 1rem; }
.quick label { font-size: .85rem; font-weight: 600; display: grid; gap: .2rem; }
.quick input, .quick select { width: auto; min-height: 40px; padding: .4rem .5rem; }
.lessons { display: grid; gap: .75rem; }
.lrow { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; background: #fff; }
.lrow.ls-reserved { border-style: dashed; }
.lrow .when { display: flex; flex-wrap: wrap; align-items: center; gap: .4rem .75rem; padding: .5rem .75rem; background: #faf8f5; }
.lrow .when .btn { margin-left: auto; }
.lrow .no { font-weight: 700; min-width: 3.6rem; }
.lrow .no small { font-weight: normal; color: var(--soft); }
.three { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1px; background: var(--line); }
.three > div { padding: .6rem .75rem; }
.three h3, .three label { display: block; font-size: .8rem; font-weight: 600; margin: 0 0 .25rem; color: var(--soft); }
.three p { margin: 0; overflow-wrap: anywhere; }
.three .c1 { background: #fffde8; }
.three .c2 { background: #e9fafa; }
.three .c3 { background: #f8e9f8; }
.form .three { border: 1px solid var(--line); border-radius: 10px; overflow: hidden; margin-bottom: 1.1rem; }
.form .three textarea { background: rgba(255,255,255,.75); }
.three.ro { margin-bottom: 1.1rem; }
.pnote { margin: 0; padding: .5rem .75rem; border-top: 1px solid var(--line); font-size: .9rem; color: var(--soft); }
.pnote b { color: var(--ink); margin-right: .4rem; }
.hintbox { background: #eef4fd; border: 1px solid #c9dbf5; border-radius: 10px; padding: .75rem 1rem; margin-bottom: 1rem; }
.hintbox p { margin: .25rem 0 0; }
.hintbox .btn { margin-top: .6rem; }
.nextbox { border: 1px dashed #b9c0ca; border-radius: 10px; padding: .6rem .9rem .9rem; margin: 0 0 1.1rem; display: flex; flex-wrap: wrap; gap: .75rem; }
.nextbox legend { font-weight: 600; font-size: .95rem; padding: 0 .4rem; }
.nextbox legend small { font-weight: normal; color: var(--soft); }
.nextbox label { font-size: .85rem; font-weight: 600; display: grid; gap: .2rem; }
.nextbox input { width: auto; }
.plain { list-style: none; margin: 0; padding: 0; }
.plain li { display: flex; align-items: center; justify-content: space-between; gap: .75rem; padding: .6rem 0; border-top: 1px solid var(--line); flex-wrap: wrap; }
.plain li:first-child { border-top: 0; }
.plain .sub { display: block; color: var(--soft); font-size: .875rem; }
.plain .acts { display: flex; align-items: center; gap: .9rem; font-size: .9rem; }
.warn { color: var(--warn); }
.total { background: #faf8f5; border-radius: 8px; padding: .5rem .75rem; font-weight: 600; margin: 0 0 .5rem; }
.people { display: grid; gap: .5rem; margin-bottom: .75rem; }
.person { display: grid; grid-template-columns: minmax(6em, 10em) 7.5em minmax(0, 1fr); gap: .5rem; align-items: center; }
.person select, .person input { min-height: 40px; padding: .4rem .5rem; }
@media (max-width: 560px) { .person { grid-template-columns: 1fr 7.5em; } .person input { grid-column: 1 / -1; } }
.danger { margin: .5rem 0 2rem; text-align: right; }
.link.dark { color: var(--warn); font-size: .875rem; }

/* 領収書 */
body.receipt { background: #e9e9e9; font-family: "Hiragino Mincho ProN", "Yu Mincho", "Noto Serif JP", serif; color: #000; }
.receipt .tools { max-width: 190mm; margin: 1rem auto; display: flex; gap: .5rem; font-family: "Hiragino Sans", sans-serif; }
.sheet-a4 { background: #fff; width: 190mm; max-width: 100%; margin: 0 auto 2rem; padding: 8mm 12mm; }
.rc { position: relative; padding: 6mm 0 9mm; border-bottom: 1px dotted #555; }
.rc h1 { text-align: center; font-size: 26pt; letter-spacing: .15em; margin: 0 0 6mm; }
.rc .meta { position: absolute; right: 0; top: 9mm; margin: 0; line-height: 2; font-size: 11pt; }
.rc .meta span { display: inline-block; min-width: 34mm; text-align: center; border-bottom: 1px dotted #555; }
.rc .to { font-size: 17pt; margin: 0 0 5mm; }
.rc .to span { display: inline-block; min-width: 80mm; border-bottom: 1px solid #000; font-weight: 700; padding: 0 2mm; }
.rc .amount { margin: 0 0 6mm; border: 1px solid #999; background: #f3f3f3; padding: 3mm 6mm; font-size: 24pt; font-weight: 700; width: 78%; }
.rc .amount small { font-size: 11pt; font-weight: 400; letter-spacing: .5em; margin-right: 12mm; }
.rc .note { color: #000; text-align: center; font-size: 16pt; text-decoration: underline; margin: 0 0 6mm; }
.rc .from { display: flex; align-items: center; justify-content: center; gap: 12mm; }
.rc .from strong { font-size: 17pt; }
.rc .from p { margin: 1mm 0 0; font-size: 10.5pt; line-height: 1.45; }
.rc .inshi { font-size: 11pt; letter-spacing: .3em; }
.rc .stamp { width: 24mm; height: 26mm; border: 1px solid #999; font-size: 10pt; text-align: center; padding-top: 1.5mm; color: #555; }
@media print {
  body.receipt { background: #fff; }
  .receipt .tools { display: none; }
  .sheet-a4 { margin: 0; padding: 0; width: auto; }
  @page { size: A4; margin: 12mm; }
}

/* 수업 기록 화면: 왼쪽에 입력, 오른쪽에 지난 수업 */
body.wide .wrap { max-width: 1320px; }
.split { display: grid; gap: 1rem; align-items: start; }
@media (min-width: 1000px) {
  .split { grid-template-columns: minmax(0, 1fr) minmax(300px, 400px); }
  .past { position: sticky; top: .75rem; max-height: calc(100vh - 1.5rem); overflow-y: auto; }
}
.past { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 1rem; }
.past h2 { margin-bottom: .5rem; }
.past article { border-top: 1px solid var(--line); padding: .7rem 0; }
.past article header { margin-bottom: .35rem; }
.past article div { border-left: 5px solid; padding: .15rem .6rem; margin-bottom: .3rem; }
.past article b { font-size: .75rem; color: var(--soft); display: block; }
.past article p { margin: 0; overflow-wrap: anywhere; }
.past .c1 { border-color: #efe58a; background: #fffde8; }
.past .c2 { border-color: #9bdede; background: #e9fafa; }
.past .c3 { border-color: #dfa9df; background: #f8e9f8; }
.past .c4 { border-color: #c5cad3; background: #f5f6f8; }
.past .more { margin: .5rem 0 0; font-size: .9rem; }