:root {
  color-scheme: light;
  --ink: #12231d; --muted: #607069; --line: #dce6e1; --paper: #fff; --canvas: #f3f7f4;
  --green: #0f7b55; --green-dark: #075f40; --green-soft: #e7f5ee; --danger: #b42318; --danger-soft: #fff0ee;
  font-family: Pretendard, "Noto Sans KR", "Malgun Gothic", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--canvas); }
button, input, select, textarea { font: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
.topbar { height: 68px; display: flex; align-items: center; justify-content: space-between; padding: 0 max(24px, calc((100vw - 1180px) / 2)); background: rgba(255,255,255,.92); border-bottom: 1px solid var(--line); }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-size: 20px; font-weight: 800; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 10px; color: white; background: var(--green); font-weight: 900; }
.version-badge { padding: 5px 8px; border: 1px solid #c8ddd4; border-radius: 999px; color: var(--green-dark); background: var(--green-soft); font-size: 11px; font-weight: 800; letter-spacing: 0; }
.top-note { color: var(--muted); font-size: 13px; }
.page-shell { max-width: 1180px; margin: 0 auto; padding: 76px 24px 64px; }
.intro { max-width: 800px; margin-bottom: 44px; }
.eyebrow, .step { margin: 0 0 11px; color: var(--green); font-size: 12px; font-weight: 800; letter-spacing: .12em; }
h1 { margin: 0; font-size: clamp(40px, 6vw, 66px); line-height: 1.1; letter-spacing: -.045em; }
.intro-copy { max-width: 680px; margin: 22px 0; color: var(--muted); font-size: 17px; line-height: 1.75; }
.trust-list { display: flex; flex-wrap: wrap; gap: 12px 22px; padding: 0; margin: 0; list-style: none; color: #395149; font-size: 14px; }
.trust-list span { color: var(--green); font-weight: 900; }
.workspace { background: var(--paper); border: 1px solid var(--line); border-radius: 24px; box-shadow: 0 18px 48px rgba(24,56,43,.08); overflow: hidden; }
.upload-panel, .result-panel { padding: clamp(24px, 5vw, 52px); }
.panel-heading, .result-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; margin-bottom: 26px; }
h2 { margin: 0; font-size: 24px; letter-spacing: -.025em; }
.format-chip { padding: 7px 11px; border-radius: 999px; color: var(--green-dark); background: var(--green-soft); font-size: 12px; font-weight: 800; }
.drop-zone { min-height: 260px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 10px; padding: 30px; border: 2px dashed #b7cdc3; border-radius: 18px; background: #fbfdfc; cursor: pointer; transition: .2s ease; text-align: center; }
.drop-zone:hover, .drop-zone.dragging { border-color: var(--green); background: var(--green-soft); transform: translateY(-1px); }
.drop-zone:focus-within { outline: 3px solid rgba(15,123,85,.18); border-color: var(--green); }
.drop-zone input { position: absolute; inline-size: 1px; block-size: 1px; opacity: 0; }
.drop-zone strong { font-size: 18px; }
.drop-zone > span:last-child { color: var(--muted); font-size: 13px; }
.upload-icon { display: grid; place-items: center; width: 54px; height: 54px; margin-bottom: 5px; border-radius: 17px; color: var(--green); background: var(--green-soft); }
.upload-icon svg { width: 26px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.selected-file { display: flex; align-items: center; gap: 13px; padding: 16px; border: 1px solid var(--line); border-radius: 14px; background: #fbfdfc; }
.file-badge { display: grid; place-items: center; width: 48px; height: 48px; flex: 0 0 auto; border-radius: 11px; color: var(--green-dark); background: var(--green-soft); font-size: 11px; font-weight: 900; }
.file-meta { min-width: 0; display: flex; flex: 1; flex-direction: column; gap: 4px; }
.file-meta strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-meta span { color: var(--muted); font-size: 12px; }
.text-button { padding: 8px; border: 0; color: var(--green-dark); background: transparent; cursor: pointer; font-weight: 700; }
.sample-option { display: grid; grid-template-columns: 22px 1fr; gap: 10px; align-items: start; margin-top: 16px; padding: 15px 16px; border: 1px solid var(--line); border-radius: 13px; background: #fbfdfc; cursor: pointer; }
.sample-option input { position: absolute; inline-size: 1px; block-size: 1px; opacity: 0; }
.checkmark { display: grid; place-items: center; width: 22px; height: 22px; border: 1px solid #9ebcaf; border-radius: 6px; color: transparent; background: white; font-size: 14px; font-weight: 900; }
.sample-option input:checked + .checkmark { color: white; border-color: var(--green); background: var(--green); }
.sample-option input:focus-visible + .checkmark { outline: 3px solid rgba(15,123,85,.22); outline-offset: 2px; }
.sample-option > span:last-child { display: flex; flex-direction: column; gap: 4px; }
.sample-option strong { font-size: 14px; }
.sample-option small { color: var(--muted); font-size: 12px; line-height: 1.55; }
.primary-button, .secondary-button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; padding: 0 20px; border-radius: 11px; font-weight: 800; text-decoration: none; cursor: pointer; }
.primary-button { width: 100%; margin-top: 16px; color: #fff; border: 0; background: var(--green); }
.primary-button:hover:not(:disabled) { background: var(--green-dark); }
.primary-button:disabled { cursor: not-allowed; opacity: .45; }
.primary-button.compact { width: auto; min-height: 42px; margin: 0; }
.secondary-button { min-height: 42px; color: var(--green-dark); border: 1px solid #a8c7ba; background: white; }
.primary-button:focus-visible, .secondary-button:focus-visible, .text-button:focus-visible { outline: 3px solid rgba(15,123,85,.22); outline-offset: 2px; }
.progress-card, .error-card { display: flex; align-items: center; gap: 14px; margin-top: 16px; padding: 16px; border-radius: 13px; }
.progress-card { background: var(--green-soft); }
.error-card { align-items: flex-start; flex-direction: column; gap: 5px; color: var(--danger); background: var(--danger-soft); }
.progress-card > div:last-child { display: flex; flex-direction: column; gap: 4px; }
.progress-card span, .error-card span { font-size: 13px; }
.spinner { width: 24px; height: 24px; flex: 0 0 auto; border: 3px solid #a8d5c3; border-top-color: var(--green); border-radius: 50%; animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.result-actions { display: flex; gap: 8px; }
.success-step { display: inline-block; padding: 6px 9px; border-radius: 999px; background: var(--green-soft); letter-spacing: 0; }
.security-summary { display: grid; grid-template-columns: auto 1fr auto; gap: 14px; align-items: start; padding: 18px; margin-bottom: 20px; border: 1px solid #b8ddcc; border-radius: 14px; background: var(--green-soft); }
.shield { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; color: white; background: var(--green); font-weight: 900; }
.security-summary ul { display: flex; flex-wrap: wrap; gap: 5px 18px; padding: 0; margin: 7px 0 0; color: #456158; font-size: 12px; list-style: none; }
.security-summary li::before { content: "·"; margin-right: 5px; }
.expiry { color: var(--green-dark); font-size: 12px; font-weight: 800; white-space: nowrap; }
.viewer-shell { overflow: hidden; border: 1px solid var(--line); border-radius: 14px; background: #e8eeeb; }
#pdf-viewer { display: block; width: 100%; height: min(74vh,900px); min-height: 540px; border: 0; background: #e8eeeb; }
.viewer-fallback { padding: 10px 14px; color: var(--muted); background: white; border-top: 1px solid var(--line); font-size: 12px; text-align: center; }
.viewer-fallback a { color: var(--green-dark); font-weight: 700; }
.download-only { display: flex; align-items: center; gap: 16px; padding: 24px; border: 1px solid var(--line); border-radius: 14px; background: #fbfdfc; }
.download-only .file-badge { width: 58px; height: 58px; }
.download-only p { margin: 6px 0 0; color: var(--muted); font-size: 13px; line-height: 1.6; }
.feedback-panel { margin-top: 20px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: #fbfdfc; }
.feedback-heading { display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.feedback-heading h3 { margin: 0; font-size: 17px; }
.feedback-heading p { margin: 6px 0 0; color: var(--muted); font-size: 13px; line-height: 1.55; }
.feedback-form { display: grid; grid-template-columns: 1fr 180px; gap: 14px; margin-top: 18px; padding-top: 18px; border-top: 1px solid var(--line); }
.feedback-form label { display: flex; flex-direction: column; gap: 7px; font-size: 13px; font-weight: 700; }
.feedback-form label small { color: var(--muted); font-weight: 500; }
.feedback-form select, .feedback-form input, .feedback-form textarea { width: 100%; border: 1px solid #b7c9c1; border-radius: 10px; color: var(--ink); background: white; }
.feedback-form select, .feedback-form input { min-height: 44px; padding: 0 12px; }
.feedback-form textarea { min-height: 110px; padding: 12px; resize: vertical; line-height: 1.55; }
.feedback-form select:focus, .feedback-form input:focus, .feedback-form textarea:focus { outline: 3px solid rgba(15,123,85,.16); border-color: var(--green); }
.feedback-description, .feedback-actions { grid-column: 1 / -1; }
.feedback-actions { display: flex; align-items: center; gap: 12px; }
.feedback-actions .primary-button { margin: 0; }
#feedback-status { color: var(--green-dark); font-size: 13px; font-weight: 700; }
.about { max-width: 820px; margin: 76px auto 0; text-align: center; }
.about > p:not(.eyebrow):not(.limitation) { margin: 16px auto 28px; color: var(--muted); line-height: 1.7; }
.feature-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
.feature-grid article { display: flex; flex-direction: column; gap: 7px; padding: 20px; border: 1px solid var(--line); border-radius: 14px; background: rgba(255,255,255,.7); }
.feature-grid span { color: var(--muted); font-size: 12px; }
.limitation { margin: 24px 0 0; color: #7a847f; font-size: 12px; line-height: 1.6; }
[hidden] { display: none !important; }
@media (max-width: 700px) {
  .topbar { height: 60px; padding: 0 18px; } .top-note { display: none; } .brand { gap: 8px; } .version-badge { padding: 4px 7px; } .page-shell { padding: 48px 16px 42px; }
  .intro { margin-bottom: 30px; } h1 { font-size: 39px; } .intro-copy { font-size: 15px; }
  .trust-list { flex-direction: column; gap: 8px; } .workspace { border-radius: 18px; }
  .upload-panel, .result-panel { padding: 22px 16px; } .panel-heading, .result-heading { flex-direction: column; }
  .result-actions { width: 100%; } .result-actions > * { flex: 1; } .drop-zone { min-height: 220px; padding: 22px 14px; }
  .security-summary { grid-template-columns: auto 1fr; } .expiry { grid-column: 2; } #pdf-viewer { min-height: 460px; }
  .feedback-heading { align-items: stretch; flex-direction: column; } .feedback-form { grid-template-columns: 1fr; } .feedback-description, .feedback-actions { grid-column: 1; }
  .feature-grid { grid-template-columns: 1fr; }
}
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { scroll-behavior: auto !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; } }

.history-list { padding-left: 1.5rem; line-height: 2; }
.history-list li { border-bottom: 1px solid #e5e7eb; }

.history-list li { display: flex; align-items: center; justify-content: space-between; gap: 18px; padding: 8px 0; text-align: left; }
.history-actions { display: inline-flex; gap: 12px; white-space: nowrap; }
.history-download { color: var(--green-dark); font-size: 13px; font-weight: 800; }
@media (max-width: 700px) { .history-list li { align-items: flex-start; flex-direction: column; gap: 4px; } .history-actions { flex-wrap: wrap; } }