/* assets/app.css — 자체 호스팅, 외부 CDN 없음 */
:root {
  --bg: #09090b;
  --bg-elev: #101013;
  --bg-elev2: #18181b;
  --border: #27272a;
  --border-strong: #3f3f46;
  --text: #d4d4d8;
  --text-dim: #a1a1aa;
  --text-faint: #8b8b93;
  --text-strong: #fafafa;
  --accent: #2563eb;
  --accent-hover: #3b82f6;
  --ok: #34d399;
  --ok-dim: #064e3b;
  --err: #f87171;
  --radius: 4px;
  --font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Apple SD Gothic Neo", "Malgun Gothic", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { color-scheme: dark; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
a:hover { color: var(--text-strong); }
img { max-width: 100%; display: block; }

/* icons */
.icon { width: 16px; height: 16px; flex: none; stroke: currentColor; fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.icon-lg { width: 20px; height: 20px; }

/* top bar */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  height: 48px; padding: 0 16px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: rgba(9,9,11,.85); backdrop-filter: blur(8px); z-index: 20;
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 600; color: var(--text-strong); }
.brand-sub { color: var(--text-faint); font-weight: 400; border-left: 1px solid var(--border); padding-left: 8px; margin-left: 2px; }
.topnav { display: flex; align-items: center; gap: 4px; }
.topnav a { padding: 6px 10px; border-radius: var(--radius); color: var(--text-dim); font-size: 13px; }
.topnav a:hover, .topnav a[aria-current="page"] { background: var(--bg-elev2); color: var(--text-strong); }

/* language switcher */
.lang { position: relative; }
.lang-btn { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: var(--radius);
  border: 1px solid var(--border); background: transparent; color: var(--text-dim); cursor: pointer; font-size: 13px; font-family: inherit; }
.lang-btn:hover { border-color: var(--border-strong); color: var(--text-strong); }
.lang-menu { position: absolute; right: 0; top: calc(100% + 6px); min-width: 150px; background: var(--bg-elev2);
  border: 1px solid var(--border); border-radius: var(--radius); padding: 4px; display: none; }
.lang-menu[data-open="true"] { display: block; }
.lang-menu a { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding: 7px 10px; border-radius: var(--radius); font-size: 13px; color: var(--text-dim); }
.lang-menu a:hover { background: var(--bg-elev); color: var(--text-strong); }
.lang-menu a[aria-current="true"] { color: var(--text-strong); }

/* layout */
main { flex: 1; width: 100%; max-width: 960px; margin: 0 auto; padding: 32px 16px 64px; }
.hero { margin-bottom: 28px; }
.hero h1 { font-size: 28px; line-height: 1.25; margin: 0 0 10px; color: var(--text-strong); letter-spacing: -0.01em; }
.hero p { margin: 0; color: var(--text-dim); max-width: 60ch; }
.crumbs { font-size: 12px; color: var(--text-faint); margin-bottom: 16px; }
.crumbs a:hover { color: var(--text-dim); }

/* tool card */
.panel { border: 1px solid var(--border); border-radius: var(--radius); background: var(--bg-elev); }
.panel + .panel { margin-top: 20px; }
.panel-head { padding: 12px 14px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.panel-title { font-size: 12px; text-transform: uppercase; letter-spacing: .08em; color: var(--text-faint); font-family: var(--mono); margin: 0; }
.panel-body { padding: 14px; }

/* dropzone */
.drop { border: 1px dashed var(--border-strong); border-radius: var(--radius); padding: 36px 16px; text-align: center; cursor: pointer;
  transition: border-color .15s, background .15s; background: transparent; }
.drop:hover, .drop.dragover { border-color: var(--accent); background: rgba(37,99,235,.06); }
.drop .icon-lg { color: var(--text-faint); margin: 0 auto 10px; }
.drop-title { color: var(--text); margin: 0; }
.drop-sub { color: var(--text-faint); font-size: 12px; margin: 2px 0 0; }

/* controls */
.controls { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 14px; margin-top: 14px; }
.field { display: flex; flex-direction: column; gap: 6px; }
.field label { font-size: 12px; color: var(--text-faint); font-family: var(--mono); text-transform: uppercase; letter-spacing: .06em; }
.field select, .field input[type="number"] {
  width: 100%; padding: 7px 9px; background: var(--bg-elev2); border: 1px solid var(--border); border-radius: var(--radius);
  color: var(--text); font-family: inherit; font-size: 13px; outline: none;
}
.field select:focus, .field input:focus { border-color: var(--accent); }
.field input[type="range"] { width: 100%; accent-color: var(--accent); }
.field .range-row { display: flex; align-items: center; gap: 10px; }
.field .range-val { font-family: var(--mono); font-size: 12px; color: var(--text-dim); min-width: 34px; text-align: right; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 8px 14px; border-radius: var(--radius);
  border: 1px solid var(--border); background: var(--bg-elev2); color: var(--text); font-family: inherit; font-size: 13px;
  cursor: pointer; transition: background .15s, border-color .15s; }
.btn:hover { border-color: var(--border-strong); background: #202024; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--text-strong); color: #18181b; border-color: var(--text-strong); font-weight: 600; }
.btn-primary:hover { background: #fff; border-color: #fff; }
.btn-sm { padding: 5px 9px; font-size: 12px; }
.actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }

/* results */
.results { display: flex; flex-direction: column; gap: 10px; margin-top: 14px; }
.item { display: flex; align-items: center; gap: 12px; border: 1px solid var(--border); border-radius: var(--radius); padding: 10px; background: var(--bg-elev); }
.thumb { width: 48px; height: 48px; flex: none; border-radius: var(--radius); overflow: hidden; background: var(--bg-elev2); border: 1px solid var(--border);
  display: grid; place-items: center; }
.thumb img { width: 100%; height: 100%; object-fit: cover; }
.item-main { flex: 1; min-width: 0; }
.item-name { color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.item-meta { font-size: 11px; color: var(--text-faint); font-family: var(--mono); margin-top: 3px; display: flex; flex-wrap: wrap; gap: 10px; }
.tag-ok { color: var(--ok); }
.tag-err { color: var(--err); }
.item-actions { display: flex; gap: 6px; flex: none; }

.savings-bar { height: 3px; background: var(--border); border-radius: 2px; overflow: hidden; margin-top: 6px; }
.savings-bar span { display: block; height: 100%; background: var(--ok); }

/* prose */
.prose h2 { font-size: 18px; color: var(--text-strong); margin: 0 0 12px; }
.prose ol, .prose ul { margin: 0; padding-left: 20px; color: var(--text-dim); }
.prose li { margin-bottom: 6px; }
.faq details { border-bottom: 1px solid var(--border); padding: 10px 0; }
.faq details:last-child { border-bottom: 0; }
.faq summary { cursor: pointer; color: var(--text); list-style: none; display: flex; justify-content: space-between; gap: 12px; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--text-faint); font-family: var(--mono); }
.faq details[open] summary::after { content: "\2212"; }
.faq p { margin: 10px 0 0; color: var(--text-dim); }

.notice { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--text-faint); margin-top: 14px; }

footer { border-top: 1px solid var(--border); padding: 20px 16px; color: var(--text-faint); font-size: 12px; }
footer .wrap { max-width: 960px; margin: 0 auto; display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between; }

.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
.tool-card { display: flex; align-items: center; gap: 12px; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px; background: var(--bg-elev); transition: border-color .15s; }
.tool-card:hover { border-color: var(--border-strong); }
.tool-card .icon-lg { color: var(--text-faint); }
.tool-card strong { color: var(--text-strong); font-weight: 600; display: block; }
.tool-card span { color: var(--text-faint); font-size: 12px; }

/* ===== 모바일 최적화 ===== */
@media (max-width: 640px) {
  /* iOS: 입력 요소가 16px 미만이면 포커스 시 화면이 자동 확대됨 → 16px로 고정 */
  .field select, .field input[type="number"], .field input[type="range"] { font-size: 16px; }

  /* 터치 타깃 최소 44px */
  .btn, .btn-sm { min-height: 44px; }
  .lang-btn { min-height: 44px; font-size: 16px; }
  .topnav a { min-height: 44px; display: inline-flex; align-items: center; }
  .lang-menu a { min-height: 44px; }
  .drop { padding: 32px 14px; }

  /* 레이아웃: 상단바 여백·글자 정리 */
  .topbar { padding: 0 12px; }
  .brand-sub { display: none; }
  main { padding: 24px 12px 48px; }
  .hero h1 { font-size: 24px; }

  /* 컨트롤 세로 정렬 */
  .controls { grid-template-columns: 1fr; gap: 12px; }

  /* 액션 버튼 폭을 꽉 채워 탭하기 쉽게 */
  .actions .btn { flex: 1 1 auto; }

  /* 결과 항목: 정보와 액션을 세로 배치 */
  .item { align-items: flex-start; }
  .item-main { flex-basis: calc(100% - 60px); }
  .item-actions { width: 100%; justify-content: flex-end; margin-top: 4px; }
  .item-actions .btn { flex: 0 0 auto; }
  .thumb { width: 44px; height: 44px; }

  /* 도구 카드 1열, 푸터 세로 정렬 */
  .tool-grid { grid-template-columns: 1fr; }
  footer .wrap { flex-direction: column; gap: 6px; }

  /* 모바일에선 스크롤바 숨김 */
  ::-webkit-scrollbar { width: 0; height: 0; }
}

/* 가로가 아주 좁은 기기 */
@media (max-width: 380px) {
  .hero h1 { font-size: 20px; }
  .lang-btn span { display: none; }   /* 아이콘만 남겨 공간 확보 */
}

/* 터치 기기: hover 효과가 눌린 상태로 남지 않도록 */
@media (hover: none) {
  .btn:hover { background: var(--bg-elev2); border-color: var(--border); }
  .btn-primary:hover { background: var(--text-strong); border-color: var(--text-strong); }
  .tool-card:hover { border-color: var(--border); }
  .drop:hover { border-color: var(--border-strong); background: transparent; }
  .lang-btn:hover { border-color: var(--border); color: var(--text-dim); }
  .topnav a:hover { background: transparent; color: var(--text-dim); }
}