/* 모두의툴 — 공용 디자인 시스템. 의존성 없음, 시스템 폰트, 라이트/다크 자동+수동. */
:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --text: #1c2330;
  --text-soft: #5b6575;
  --line: #e3e7ee;
  --accent: #2563eb;
  --accent-soft: #eff4ff;
  --accent-text: #1d4ed8;
  --ok: #16a34a;
  --ok-text: #15703b; /* 12.5px 배지 텍스트용 — 흰 배경 4.5:1 이상 (axe color-contrast) */
  --warn: #d97706;
  --danger: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 2px rgb(16 24 40 / .04), 0 4px 16px rgb(16 24 40 / .06);
  --maxw: 880px;
}
:root[data-theme="dark"] {
  --bg: #0f1420;
  --surface: #171e2e;
  --surface-2: #1f2739;
  --text: #e8ecf4;
  --text-soft: #98a2b6;
  --line: #2a3348;
  --accent: #4f83f7;
  --accent-soft: #1c2740;
  --accent-text: #8db0ff;
  --ok-text: #4ade80;
  --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 6px 20px rgb(0 0 0 / .35);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1420; --surface: #171e2e; --surface-2: #1f2739; --text: #e8ecf4;
    --text-soft: #98a2b6; --line: #2a3348; --accent: #4f83f7; --accent-soft: #1c2740;
    --accent-text: #8db0ff; --ok-text: #4ade80; --shadow: 0 1px 2px rgb(0 0 0 / .3), 0 6px 20px rgb(0 0 0 / .35);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard Variable", Pretendard, "Malgun Gothic", "Noto Sans KR", "Segoe UI", Roboto, sans-serif;
  word-break: keep-all;
}
img { max-width: 100%; }
a { color: var(--accent-text); text-decoration: none; }
a:hover { text-decoration: underline; }
/* 본문 속 링크는 밑줄 상시 — 색만으로 구분하면 WCAG 1.4.1 위반 (axe link-in-text-block) */
.guide a:not(.btn), .faq a, .tip a, p a:not(.btn) { text-decoration: underline; text-underline-offset: 2px; }

/* ── 헤더 ─────────────────────────────── */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 0 16px;
  display: flex; align-items: center; gap: 12px; height: 56px;
}
.logo { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 17px; color: var(--text); min-width: 0; }
/* 320px 대응: 브랜드명이 길어도(예: ThisIsMyCalculator) 로고가 줄어들며 말줄임 — 로그인·테마 버튼이 화면 밖으로 밀리지 않게 */
.logo .brand { overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.site-header .inner > * { flex-shrink: 0; }
.site-header .inner > .logo { flex-shrink: 1; }
.logo:hover { text-decoration: none; }
.logo .mark {
  width: 26px; height: 26px; border-radius: 8px; background: var(--accent);
  color: #fff; display: grid; place-items: center; font-size: 14px; font-weight: 900;
}
.header-spacer { flex: 1; }
.icon-btn {
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  width: 36px; height: 36px; border-radius: 10px; cursor: pointer; font-size: 16px;
  display: grid; place-items: center;
}
.icon-btn:hover { background: var(--surface-2); }

/* ── 레이아웃 ─────────────────────────── */
main { max-width: var(--maxw); margin: 0 auto; padding: 24px 16px 56px; }
.breadcrumb { font-size: 13px; color: var(--text-soft); margin: 4px 0 14px; }
.breadcrumb a { color: var(--text-soft); }
.page-title { font-size: 26px; line-height: 1.3; margin: 0 0 6px; font-weight: 800; }
.page-sub { color: var(--text-soft); margin: 0 0 20px; font-size: 15px; }
.privacy-badge {
  display: inline-flex; align-items: center; gap: 6px; font-size: 12.5px; font-weight: 600;
  color: var(--ok-text, var(--ok)); background: color-mix(in srgb, var(--ok) 10%, transparent);
  border: 1px solid color-mix(in srgb, var(--ok) 25%, transparent);
  padding: 3px 10px; border-radius: 99px; margin-left: 8px; vertical-align: 3px;
}

/* ── 카드/툴 UI ───────────────────────── */
.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 22px;
}
.tool-card { margin-bottom: 26px; }
.dropzone {
  border: 2px dashed var(--line); border-radius: var(--radius); padding: 36px 20px;
  text-align: center; color: var(--text-soft); cursor: pointer; transition: all .15s ease;
  background: var(--surface-2);
}
.dropzone:hover, .dropzone.drag {
  border-color: var(--accent); background: var(--accent-soft); color: var(--accent-text);
}
.dropzone .big { font-size: 34px; display: block; margin-bottom: 8px; }
.dropzone strong { color: var(--text); }
.dropzone input[type=file] { display: none; }

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  background: var(--accent); color: #fff; border: 0; border-radius: 12px;
  font-size: 15.5px; font-weight: 700; padding: 12px 22px; cursor: pointer;
  transition: filter .12s ease;
}
.btn:hover { filter: brightness(1.08); }
.btn:disabled { opacity: .45; cursor: not-allowed; filter: none; }
.btn.secondary { background: var(--surface-2); color: var(--text); border: 1px solid var(--line); }
.btn.block { width: 100%; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 16px; }

.file-list { list-style: none; margin: 16px 0 0; padding: 0; display: grid; gap: 8px; }
.file-item {
  display: flex; align-items: center; gap: 10px; background: var(--surface-2);
  border: 1px solid var(--line); border-radius: 10px; padding: 9px 12px; font-size: 14px;
}
.file-item .name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-weight: 600; }
.file-item .meta { color: var(--text-soft); font-size: 12.5px; flex-shrink: 0; }
.file-item .mini {
  border: 1px solid var(--line); background: var(--surface); color: var(--text);
  border-radius: 8px; width: 28px; height: 28px; cursor: pointer; font-size: 13px; flex-shrink: 0;
}
.file-item .mini:hover { background: var(--accent-soft); }

.result {
  margin-top: 18px; padding: 16px; border-radius: 12px; display: none;
  background: color-mix(in srgb, var(--ok) 8%, transparent);
  border: 1px solid color-mix(in srgb, var(--ok) 30%, transparent);
}
.result.show { display: block; }
.result.error { background: color-mix(in srgb, var(--danger) 8%, transparent); border-color: color-mix(in srgb, var(--danger) 30%, transparent); }
.progress { height: 6px; border-radius: 99px; background: var(--surface-2); overflow: hidden; margin-top: 14px; display: none; }
.progress.show { display: block; }
.progress > div { height: 100%; width: 0%; background: var(--accent); transition: width .2s ease; }

/* 옵션 폼 */
.opts { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 16px; align-items: center; }
/* max-width 제약: 옵션 문구가 긴 select는 최소폭이 옵션 텍스트라 320px에서 몸통을 밀어낸다(모바일 스모크) */
.opts label { font-size: 14px; color: var(--text-soft); display: flex; align-items: center; gap: 7px; max-width: 100%; min-width: 0; flex-wrap: wrap; }
.opts select { max-width: 100%; min-width: 0; }
.opts input[type=number], .opts input[type=text], .opts select, .field input, .field select {
  background: var(--surface); color: var(--text); border: 1px solid var(--line);
  border-radius: 10px; padding: 9px 12px; font-size: 15px; font-family: inherit;
}
.opts input[type=range] { accent-color: var(--accent); }
input:focus, select:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 40%, transparent); outline-offset: 1px; }

/* 계산기 공용 */
.calc-grid { display: grid; gap: 14px; }
.field { display: grid; gap: 6px; }
.field > span { font-size: 13.5px; font-weight: 600; color: var(--text-soft); }
.calc-out {
  margin-top: 6px; padding: 18px; border-radius: 12px; background: var(--accent-soft);
  border: 1px solid color-mix(in srgb, var(--accent) 25%, transparent);
}
.calc-out .num { font-size: 28px; font-weight: 800; color: var(--accent-text); }
.calc-out .sub { font-size: 13.5px; color: var(--text-soft); margin-top: 4px; }
textarea.big-input {
  width: 100%; min-height: 220px; resize: vertical; background: var(--surface); color: var(--text);
  border: 1px solid var(--line); border-radius: 12px; padding: 14px; font-size: 15px; font-family: inherit; line-height: 1.7;
}

/* ── 허브(index) ──────────────────────── */
.hero { text-align: center; padding: 34px 0 10px; }
.hero h1 { font-size: 30px; margin: 0 0 10px; font-weight: 900; }
.hero p { color: var(--text-soft); margin: 0 auto; max-width: 560px; }
.cat-title { font-size: 15px; font-weight: 800; color: var(--text-soft); margin: 30px 0 12px; text-transform: uppercase; letter-spacing: .04em; }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; }
.tool-tile {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; display: flex; gap: 12px; align-items: flex-start; color: var(--text);
  transition: transform .12s ease, border-color .12s ease; box-shadow: var(--shadow);
}
.tool-tile:hover { transform: translateY(-2px); border-color: var(--accent); text-decoration: none; }
.tool-tile .emoji { font-size: 26px; line-height: 1; }
.tool-tile b { display: block; font-size: 15.5px; margin-bottom: 3px; }
.tool-tile span { font-size: 13px; color: var(--text-soft); line-height: 1.45; display: block; }

/* ── 본문 아티클(가이드) ───────────────── */
.guide { margin-top: 34px; }
.guide h2 { font-size: 20px; margin: 30px 0 10px; }
.guide h3 { font-size: 16.5px; margin: 22px 0 8px; }
.guide p, .guide li { color: color-mix(in srgb, var(--text) 88%, var(--text-soft)); font-size: 15.5px; }
.guide ol, .guide ul { padding-left: 22px; }
.guide .tip {
  background: var(--accent-soft); border: 1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  border-radius: 12px; padding: 12px 16px; font-size: 14.5px;
}
.faq details {
  border: 1px solid var(--line); border-radius: 12px; background: var(--surface);
  padding: 0 16px; margin-bottom: 8px;
}
.faq summary { font-weight: 700; font-size: 15px; padding: 13px 0; cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::after { content: "+"; color: var(--text-soft); font-size: 18px; }
.faq details[open] summary::after { content: "–"; }
.faq details p { margin: 0 0 14px; font-size: 14.5px; }

.related { margin-top: 34px; }
.related h2 { font-size: 17px; margin-bottom: 12px; }
.related .tool-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

/* ── 광고 슬롯: 코드 삽입 전엔 자리 자체를 안 만든다(CLS·승인정책 안전) ── */
.ad-slot { display: none; margin: 26px 0; text-align: center; }
.ad-slot.active { display: block; min-height: 100px; }
.ad-slot .ad-label { font-size: 10.5px; color: var(--text-soft); letter-spacing: .08em; margin-bottom: 4px; }

/* ── 푸터 ─────────────────────────────── */
.site-footer { border-top: 1px solid var(--line); margin-top: 40px; }
.site-footer .inner {
  max-width: var(--maxw); margin: 0 auto; padding: 26px 16px 34px;
  font-size: 13px; color: var(--text-soft); display: flex; flex-wrap: wrap; gap: 8px 18px; align-items: center;
}
.site-footer a { color: var(--text-soft); }

@media (max-width: 560px) {
  .page-title { font-size: 22px; }
  .hero h1 { font-size: 24px; }
  .card { padding: 16px; }
  .dropzone { padding: 26px 14px; }
}

/* ── 소셜 로그인 버튼 ── */
.btn-google {
  display: flex; align-items: center; justify-content: center; gap: 10px; width: 100%;
  background: var(--surface); color: var(--text); border: 1px solid var(--line);
  border-radius: 12px; font-size: 15px; font-weight: 600; padding: 11px 16px; cursor: pointer;
}
.btn-google:hover { background: var(--surface-2); }
.btn-google svg { width: 18px; height: 18px; flex-shrink: 0; }
.auth-or { display: flex; align-items: center; gap: 12px; color: var(--text-soft); font-size: 13px; margin: 4px 0; }
.auth-or::before, .auth-or::after { content: ""; flex: 1; height: 1px; background: var(--line); }