:root {
  --color-bg: #f5f4f0;
  --color-surface: #ffffff;
  --color-border: #e0dad3;
  --color-border-focus: #4a7c59;
  --color-text: #18181b;
  --color-text-muted: #6b6560;
  --color-accent: #2c5f3f;
  --color-accent-hover: #1e4530;
  --color-accent-light: #eef5f0;
  --color-accent-mid: #d4e8db;
  --color-danger: #c0392b;
  --font-body: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --radius-sm: 4px;
  --radius-md: 8px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.07), 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.09), 0 2px 6px rgba(0, 0, 0, 0.05);
  --max-width: 1120px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  min-height: 100vh;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  letter-spacing: 0;
}

.tool-nav {
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px max(24px, calc((100vw - var(--max-width)) / 2));
  background: rgba(255, 255, 255, 0.92);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.tool-nav a { color: var(--color-accent); font-weight: 650; text-decoration: none; }
.tool-nav a:hover { text-decoration: underline; }

.app-container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 44px 24px 52px;
}

.site-header {
  text-align: center;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--color-border);
}

.site-header__badge {
  display: inline-block;
  margin-bottom: 8px;
  border: 1px solid var(--color-accent-mid);
  border-radius: 20px;
  padding: 3px 10px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.68rem;
  font-weight: 700;
}

.site-title {
  color: var(--color-accent);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 750;
  line-height: 1.15;
}

.site-subtitle {
  margin-top: 8px;
  color: var(--color-text-muted);
  font-size: 0.95rem;
}

.security-badge {
  display: inline-flex;
  margin-top: 10px;
  border: 1px solid var(--color-accent-mid);
  border-radius: 20px;
  padding: 4px 12px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.78rem;
}

.error-banner {
  margin-top: 18px;
  border: 1px solid var(--color-danger);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  background: #fdf3f2;
  color: var(--color-danger);
  font-size: 0.9rem;
}

.workbench {
  margin-top: 24px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.tab-list {
  display: flex;
  gap: 6px;
  padding: 12px;
  border-bottom: 1px solid var(--color-border);
  overflow-x: auto;
}

.tab-button {
  flex: 0 0 auto;
  min-height: 38px;
  border: 1px solid var(--color-border);
  border-radius: 7px;
  padding: 0 14px;
  background: #fff;
  color: var(--color-text-muted);
  font: 700 0.86rem var(--font-body);
  cursor: pointer;
}

.tab-button:hover { border-color: var(--color-border-focus); color: var(--color-accent); }
.tab-button.is-active { border-color: var(--color-accent); background: var(--color-accent); color: #fff; }

.tab-panel { display: none; padding: 22px; }
.tab-panel.is-active { display: block; }

.panel-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 18px;
  align-items: stretch;
}

.drop-zone {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  background: #fbfbf9;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.16s, background 0.16s, box-shadow 0.16s;
}

.drop-zone:hover,
.drop-zone.is-hover {
  border-color: var(--color-border-focus);
  background: var(--color-accent-light);
  box-shadow: var(--shadow-md);
}

.drop-zone__icon {
  min-width: 62px;
  height: 40px;
  display: grid;
  place-items: center;
  border-radius: 7px;
  background: #e7eef7;
  color: #245075;
  font-size: 0.8rem;
  font-weight: 850;
}

.drop-zone__primary {
  color: var(--color-text);
  font-size: 1.05rem;
  font-weight: 700;
}

.drop-zone__secondary {
  max-width: 420px;
  color: var(--color-text-muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.settings-card {
  display: flex;
  flex-direction: column;
  gap: 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 18px;
  background: #fff;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 7px;
  color: var(--color-text-muted);
  font-size: 0.78rem;
  font-weight: 700;
}

.field input,
.field select {
  width: 100%;
  min-height: 40px;
  border: 1px solid var(--color-border);
  border-radius: 7px;
  padding: 0 11px;
  background: #fff;
  color: var(--color-text);
  font: 500 0.92rem var(--font-body);
}

.field input[type="range"] { padding: 0; accent-color: var(--color-accent); }
.field b { color: var(--color-accent); font-size: 0.82rem; }

.check-field {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-muted);
  font-size: 0.84rem;
  font-weight: 650;
}

.check-field input { accent-color: var(--color-accent); }

.btn {
  min-height: 40px;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 0 18px;
  font: 750 0.9rem var(--font-body);
  cursor: pointer;
}

.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--primary { background: var(--color-accent); color: #fff; box-shadow: 0 2px 8px rgba(44, 95, 63, 0.24); }
.btn--primary:hover:not(:disabled) { background: var(--color-accent-hover); }
.btn--secondary { border: 1px solid var(--color-border); background: #fff; color: var(--color-text); }
.btn--secondary:hover:not(:disabled) { border-color: var(--color-border-focus); background: var(--color-accent-light); }

.file-list {
  display: grid;
  gap: 8px;
  margin-top: 14px;
  list-style: none;
}

.file-list li {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  border: 1px solid var(--color-border);
  border-radius: 7px;
  padding: 10px 12px;
  background: #fff;
  color: var(--color-text-muted);
  font-size: 0.84rem;
}

.file-list b { color: var(--color-text); font-weight: 650; overflow-wrap: anywhere; }

.note {
  margin-top: 14px;
  border-radius: 7px;
  padding: 11px 12px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  font-size: 0.78rem;
  line-height: 1.55;
}

.progress-section {
  margin-top: 18px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 16px;
  background: #fff;
}

.progress-bar-wrapper {
  height: 10px;
  border-radius: 99px;
  background: #ecefeb;
  overflow: hidden;
}

.progress-bar {
  width: 0%;
  height: 100%;
  background: var(--color-accent);
  transition: width 0.18s;
}

.progress-label {
  margin-top: 8px;
  color: var(--color-text-muted);
  font-size: 0.82rem;
}

.result-card {
  margin-top: 18px;
  border: 1px solid var(--color-accent-mid);
  border-radius: var(--radius-md);
  padding: 15px 16px;
  background: var(--color-accent-light);
  color: var(--color-accent);
}

.result-card strong { display: block; font-size: 0.95rem; }
.result-card p { margin-top: 4px; font-size: 0.84rem; line-height: 1.55; }

.site-footer {
  display: flex;
  justify-content: center;
  gap: 8px;
  padding: 24px 20px;
  border-top: 1px solid var(--color-border);
  background: #fff;
  color: var(--color-text-muted);
  font-size: 0.78rem;
}

.site-footer strong { color: var(--color-accent); }

@media (max-width: 840px) {
  .panel-grid { grid-template-columns: 1fr; }
  .drop-zone { min-height: 220px; }
}

@media (max-width: 620px) {
  .tool-nav { align-items: flex-start; flex-direction: column; padding: 12px 18px; }
  .app-container { padding: 32px 16px 44px; }
  .tab-panel { padding: 16px; }
  .settings-card { padding: 14px; }
  .file-list li { flex-direction: column; gap: 4px; }
  .site-footer { flex-wrap: wrap; }
}