:root{
  --bg:#f5f4f0; --surface:#fbfbf9; --panel:#ffffff; --panel-soft:#f7f6f2;
  --ink:#1c1c1a; --ink-hover:#3a3935; --ink-2:#55534d; --sub:#7a776f; --muted:#8a877f;
  --line:#e3e1db; --line-2:#dcdad3; --line-3:#efeee9; --hover:#efeee9; --soft:#f3f2ee; --track:#ebe9e3;
  --accent:#a61e4d; /* 봉투 버건디 */
  --accent-soft:#fbe9ef;
  --env:#7c1838; --env-2:#5e0f29;
  --ok:#2b8a3e; --ok-soft:#e6f4ea; --no:#c92a2a; --no-soft:#fdecec; --info:#1c6fd0; --info-soft:#e8f1fc;
  --font:"IBM Plex Sans KR",sans-serif; --mono:"JetBrains Mono",monospace;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--font);-webkit-font-smoothing:antialiased;word-break:keep-all}
button,select,input{font:inherit;color:inherit}
.mono-label{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.app{min-height:100vh;display:flex;flex-direction:column}
.topbar{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 28px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.brand{display:flex;align-items:baseline;gap:14px;min-width:0;flex-wrap:wrap}
.brand-title{font-size:17px;font-weight:700;letter-spacing:-.01em}
.actions{display:flex;gap:8px;flex-wrap:wrap}
.btn{height:36px;padding:0 14px;background:transparent;border:1px solid var(--line-2);border-radius:999px;font-size:13px;cursor:pointer;white-space:nowrap}
.btn:hover{background:var(--hover)}
.btn--solid{background:var(--ink);color:#fff;border:none;font-weight:500}
.btn--solid:hover{background:var(--ink-hover)}
.btn--accent{background:var(--accent);color:#fff;border:none;font-weight:500;height:46px;padding:0 16px;border-radius:12px}
.btn--accent:hover{background:var(--env)}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}

.wrap{width:100%;max-width:1180px;margin:0 auto;padding:32px 28px 56px;display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);gap:28px;align-items:start}
.basis{grid-column:1 / -1}

/* ---------- 입력 ---------- */
.inputs{display:flex;flex-direction:column;gap:16px;min-width:0}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:20px;padding:22px 24px;display:flex;flex-direction:column;gap:14px;min-width:0}
.step{display:flex;align-items:center;gap:10px;margin:0;font-size:15px;font-weight:700}
.step small{font-weight:400;font-size:12px;color:var(--muted)}
.step-no{width:24px;height:24px;border-radius:50%;background:var(--accent);color:#fff;font-family:var(--mono);font-size:12px;display:inline-flex;align-items:center;justify-content:center;flex-shrink:0}
.panel--opt summary{cursor:pointer;list-style:none}
.panel--opt summary::-webkit-details-marker{display:none}
.panel--opt summary::after{content:"";margin-left:auto;width:8px;height:8px;border-right:1.5px solid var(--ink-2);border-bottom:1.5px solid var(--ink-2);transform:rotate(45deg);transition:transform .15s}
.panel--opt[open] summary::after{transform:rotate(-135deg)}
.panel--opt:not([open]) .step-no{background:var(--track);color:var(--ink-2)}
.field{display:flex;flex-direction:column;gap:7px;min-width:0}
.field--inline{flex-direction:row;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}
.field--inline .unit-box{width:150px}
.field-label{font-size:13px;font-weight:700}
.field-label small{font-weight:400;color:var(--muted);margin-left:4px}
.hint{margin:0;font-size:12px;line-height:1.6;color:var(--sub)}
.date-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.date-input{height:48px;width:100%;min-width:0;padding:0 12px;border:1.5px solid var(--line-2);border-radius:12px;background:var(--surface);font-family:var(--mono);font-size:16px;color:var(--ink);outline:none;transition:border-color .15s,box-shadow .15s}
.date-input:focus{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.unit-box{display:flex;align-items:center;border:1.5px solid var(--line-2);border-radius:12px;background:var(--surface);padding:0 12px;min-width:0;transition:border-color .15s,box-shadow .15s}
.unit-box:focus-within{border-color:var(--accent);box-shadow:0 0 0 4px var(--accent-soft)}
.unit-input{flex:1;min-width:0;width:100%;height:46px;border:none;background:transparent;outline:none;font-family:var(--mono);font-size:17px;text-align:right;color:var(--ink)}
.unit-input::placeholder{color:#bdb9ae;font-family:var(--font);font-size:13px}
.unit-box--sm .unit-input{height:40px;font-size:15px}
.unit{margin-left:6px;font-size:13px;color:var(--sub);white-space:nowrap}
.quick{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:8px}
.months{display:flex;flex-direction:column;border:1px solid var(--line);border-radius:14px;overflow:hidden}
.month{padding:12px 14px;border-bottom:1px dashed var(--line-2);display:flex;flex-direction:column;gap:8px;background:var(--panel)}
.month:last-child{border-bottom:none}
.month-head{display:flex;align-items:center;gap:8px;font-size:13px}
.month-no{font-family:var(--mono);font-size:11px;color:var(--accent);border:1px solid var(--accent);border-radius:6px;padding:1px 6px}
.month-range{font-family:var(--mono);font-size:13px;color:var(--ink);min-width:0}
.month-days{margin-left:auto;font-family:var(--mono);font-size:12px;color:var(--sub);background:var(--soft);border-radius:999px;padding:2px 8px;white-space:nowrap}
.month-in{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.mfield{display:flex;flex-direction:column;gap:4px;font-size:11.5px;color:var(--sub);min-width:0}
.extra{display:grid;grid-template-columns:1fr 1fr;gap:12px;padding-top:4px;border-top:1px solid var(--line-3);padding-top:14px}
.mini-row{display:grid;grid-template-columns:1fr 1fr;gap:10px}
.mini{display:flex;flex-direction:column;gap:5px;min-width:0;font-size:12px;color:var(--sub)}
.mini-unit{display:flex;align-items:center;gap:6px;height:38px;padding:0 10px;border:1px solid var(--line-2);border-radius:10px;background:var(--surface);color:var(--ink-2);font-size:13px}
.mini-unit:focus-within{border-color:var(--accent)}
.mini-unit input{flex:1;min-width:0;width:100%;border:none;background:transparent;outline:none;font-family:var(--mono);font-size:15px;text-align:right;color:var(--ink)}

/* ---------- 결과 ---------- */
.result{display:flex;flex-direction:column;gap:16px;min-width:0;position:sticky;top:20px}
.envelope{position:relative;border-radius:22px;overflow:hidden;background:var(--env);color:#fff;box-shadow:0 18px 40px -18px rgba(94,15,41,.55)}
.env-flap{height:64px;background:var(--env-2);clip-path:polygon(0 0,100% 0,50% 100%);position:relative}
.env-flap::after{content:"";position:absolute;left:50%;bottom:-2px;width:34px;height:34px;margin-left:-17px;border-radius:50%;background:#e0b04a;box-shadow:0 0 0 3px rgba(255,255,255,.12)}
.env-body{padding:8px 28px 24px;margin-top:-10px;display:flex;flex-direction:column;gap:6px}
.env-tag{font-size:12.5px;color:rgba(255,255,255,.72);letter-spacing:.02em}
.env-num{font-family:var(--mono);font-size:56px;font-weight:500;line-height:1.05;letter-spacing:-.04em;overflow-wrap:anywhere}
.env-num small{font-family:var(--font);font-size:22px;margin-left:6px;letter-spacing:0;color:rgba(255,255,255,.72)}
.env-words{margin:0;font-size:13px;color:#f2d38e;min-height:1em}
.env-sub{margin:8px 0 0;padding-top:12px;border-top:1px dashed rgba(255,255,255,.22);font-size:13px;line-height:1.6;color:rgba(255,255,255,.8);font-family:var(--mono)}
.envelope.is-no{background:#4b4a46}
.envelope.is-no .env-flap{background:#3a3936}
.envelope.is-no .env-flap::after{background:#9a968c}
.envelope.is-no .env-num{opacity:.55}
.env-num span{display:inline-block;animation:rise .35s ease both}
@keyframes rise{from{opacity:.2;transform:translateY(6px)}to{opacity:1;transform:none}}

.checks{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:10px}
.checks:empty{display:none}
.chk{display:flex;gap:10px;align-items:flex-start;padding:12px 14px;border-radius:14px;border:1px solid var(--line);background:var(--panel);min-width:0}
.chk-icon{width:22px;height:22px;border-radius:50%;flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;font-size:12px;font-weight:700;color:#fff}
.chk b{display:block;font-size:13px}
.chk small{display:block;font-size:11.5px;color:var(--sub);margin-top:2px;line-height:1.45}
.chk.is-ok .chk-icon{background:var(--ok)}
.chk.is-no{border-color:var(--no);background:var(--no-soft)}
.chk.is-no .chk-icon{background:var(--no)}
.chk.is-no b{color:var(--no)}
.chk.is-info .chk-icon{background:var(--info);font-family:var(--mono)}

.ledger-card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:18px 22px}
.ledger-head{display:flex;justify-content:space-between;align-items:baseline;font-weight:700;font-size:14px;padding-bottom:10px;border-bottom:2px solid var(--ink)}
.ledger{margin:0}
.lrow{display:flex;justify-content:space-between;align-items:baseline;gap:12px;padding:9px 0;border-bottom:1px dashed var(--line-2);font-size:13.5px}
.lrow dt{min-width:0;font-weight:500}
.lrow dt small{display:block;font-weight:400;font-size:11.5px;color:var(--muted);font-family:var(--mono);margin-top:2px;overflow-wrap:anywhere}
.lrow dd{margin:0;font-family:var(--mono);white-space:nowrap;text-align:right}
.lrow--sub{padding:5px 0;font-size:12.5px;color:var(--sub)}
.lrow--sub dt{font-weight:400}
.lrow--sub dt small{display:inline;margin-left:6px}
.lrow--key dd{color:var(--accent);font-weight:500}
.lrow--strike dd{color:var(--muted);text-decoration:line-through}
.lrow--total{border-top:2px solid var(--ink);border-bottom:none;margin-top:4px;padding-top:12px;font-weight:700}
.lrow--total dd{font-size:20px;color:var(--accent);font-weight:500}
.ledger-empty{margin:14px 0 4px;font-size:13px;color:var(--muted)}

/* ---------- 계산 기준 ---------- */
.basis{border-top:1px solid var(--line);padding-top:24px}
.basis-title{display:flex;align-items:baseline;gap:10px;margin:0 0 14px;font-size:16px;flex-wrap:wrap}
.basis-list{margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px 28px}
.basis-list div{display:grid;grid-template-columns:92px minmax(0,1fr);gap:10px;font-size:13px;line-height:1.6;padding:8px 0;border-bottom:1px solid var(--line-3)}
.basis-list dt{font-weight:700}
.basis-list dd{margin:0;color:var(--ink-2)}
.basis-list b{color:var(--ink)}
.basis-note{margin:14px 0 0;font-size:12.5px;color:var(--sub);line-height:1.65;background:var(--soft);border-radius:12px;padding:12px 14px}
.basis-note b{color:var(--ink)}

.toast{position:fixed;left:50%;bottom:28px;transform:translate(-50%,20px);background:var(--ink);color:#fff;padding:10px 18px;border-radius:999px;font-size:13px;opacity:0;pointer-events:none;transition:opacity .2s,transform .2s;z-index:50}
.toast.is-show{opacity:1;transform:translate(-50%,0)}

@media (max-width:900px){
  .wrap{grid-template-columns:minmax(0,1fr)}
  .result{position:static}
  .basis-list{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:640px){
  .topbar{padding:14px 16px}
  .wrap{padding:20px 16px 40px;gap:18px}
  .panel{padding:18px 16px;border-radius:16px}
  .date-row,.extra{grid-template-columns:minmax(0,1fr)}
  .date-input{font-size:15px}
  .quick{grid-template-columns:minmax(0,1fr)}
  .month{padding:12px}
  .month-in{gap:6px}
  .unit-box--sm{padding:0 8px}
  .unit-box--sm .unit-input{font-size:14px}
  .env-body{padding:6px 18px 20px}
  .env-num{font-size:42px}
  .env-num small{font-size:17px}
  .env-sub{font-size:12px}
  .ledger-card{padding:16px}
  .lrow{font-size:13px}
  .lrow--sub dt small{display:block;margin-left:0}
  .basis-list div{grid-template-columns:minmax(0,1fr);gap:2px}
}
@media (prefers-reduced-motion:reduce){
  *{transition:none !important;animation:none !important}
}

/* 다크 모드 (인쇄는 라이트 그대로) */
@media screen{
  :root[data-theme="dark"]{
    color-scheme:dark;
    --bg:#161315; --surface:#1c181a; --panel:#221d20; --panel-soft:#272225;
    --ink:#efe9ec; --ink-hover:#ffffff; --ink-2:#cdc4c8; --sub:#a59aa0; --muted:#8f858a;
    --line:#332c30; --line-2:#3f373b; --line-3:#2a2427; --hover:#2d272a; --soft:#2a2427; --track:#3a3236;
    --accent:#f0739d; --accent-soft:rgba(240,115,157,.15);
    --env:#5c1029; --env-2:#470b1f;
    --ok:#4fbf6a; --ok-soft:rgba(79,191,106,.14); --no:#ff7b7b; --no-soft:rgba(255,123,123,.1); --info:#5ea4f2; --info-soft:rgba(94,164,242,.14);
  }
  :root[data-theme="dark"] .btn--solid,
  :root[data-theme="dark"] .btn--accent,
  :root[data-theme="dark"] .step-no,
  :root[data-theme="dark"] .chk-icon,
  :root[data-theme="dark"] .toast{color:var(--bg)}
  :root[data-theme="dark"] .btn--accent:hover{background:#f597b6}
  :root[data-theme="dark"] .panel--opt:not([open]) .step-no{color:var(--ink-2)}
  :root[data-theme="dark"] .unit-input::placeholder{color:#6a6065}
  :root[data-theme="dark"] .envelope{box-shadow:inset 0 0 0 1px #7a2140,0 18px 40px -18px rgba(0,0,0,.6)}
  :root[data-theme="dark"] .envelope.is-no{background:#2f2c2e;box-shadow:inset 0 0 0 1px #4a4548}
  :root[data-theme="dark"] .envelope.is-no .env-flap{background:#262325}
}