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

:root {
  --black: #0f0f0f;
  --gray-1: #1a1a1a;
  --gray-2: #2e2e2e;
  --gray-3: #555;
  --gray-4: #888;
  --gray-5: #bbb;
  --gray-6: #e5e5e5;
  --gray-7: #f5f5f5;
  --white: #ffffff;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --font: 'Inter', system-ui, sans-serif;
  --font-display: 'DM Serif Display', Georgia, serif;
}

body { font-family: var(--font); background: var(--gray-7); color: var(--black); min-height: 100vh; display: flex; flex-direction: column; -webkit-font-smoothing: antialiased; }

.header { background: var(--white); border-bottom: 1px solid var(--gray-6); padding: 0 1.5rem; height: 52px; position: sticky; top: 0; z-index: 10; }
.header-inner { max-width: 680px; margin: 0 auto; height: 100%; display: flex; align-items: center; justify-content: space-between; }
.logo { display: flex; align-items: center; gap: 8px; }
.logo-text { font-size: 14px; font-weight: 600; color: var(--black); letter-spacing: -0.01em; }
.header-tag { font-size: 12px; color: var(--gray-4); background: var(--gray-7); border: 1px solid var(--gray-6); padding: 3px 10px; border-radius: 99px; }

.main { flex: 1; max-width: 680px; margin: 0 auto; width: 100%; padding: 2.5rem 1.25rem 3rem; }

.hero { margin-bottom: 2rem; }
.hero-eyebrow { font-size: 12px; font-weight: 500; color: var(--gray-4); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px; }
.hero-title { font-family: var(--font-display); font-size: clamp(28px, 6vw, 38px); font-weight: 400; line-height: 1.2; color: var(--black); margin-bottom: 12px; letter-spacing: -0.01em; }
.hero-sub { font-size: 15px; color: var(--gray-3); line-height: 1.7; max-width: 500px; }

.upload-card { background: var(--white); border: 1px solid var(--gray-6); border-radius: var(--radius-lg); padding: 1.5rem; margin-bottom: 1rem; }
.upload-zone { border: 1.5px dashed var(--gray-5); border-radius: var(--radius-md); padding: 2.5rem 1.5rem; text-align: center; cursor: pointer; transition: background 0.15s, border-color 0.15s; }
.upload-zone:hover { background: var(--gray-7); border-color: var(--gray-4); }
.upload-icon { color: var(--gray-4); margin-bottom: 10px; }
.upload-main { font-size: 15px; font-weight: 500; color: var(--gray-1); margin-bottom: 5px; }
.upload-sub { font-size: 13px; color: var(--gray-4); }

.file-info { display: flex; align-items: center; justify-content: space-between; padding: 10px 14px; background: var(--gray-7); border-radius: var(--radius-md); border: 1px solid var(--gray-6); }
.file-badge { display: flex; align-items: center; gap: 7px; font-size: 13px; font-weight: 500; color: var(--gray-1); }
.remove-btn { background: none; border: none; padding: 2px; cursor: pointer; color: var(--gray-4); display: flex; align-items: center; transition: color 0.1s; }
.remove-btn:hover { color: var(--black); }
.file-ready { font-size: 12px; color: #2e7d32; font-weight: 500; background: #e8f5e9; padding: 3px 10px; border-radius: 99px; }

.tool-area { background: var(--white); border: 1px solid var(--gray-6); border-radius: var(--radius-lg); overflow: hidden; }
.tabs { display: flex; border-bottom: 1px solid var(--gray-6); background: var(--gray-7); }
.tab { flex: 1; padding: 12px; font-size: 13px; font-weight: 500; font-family: var(--font); color: var(--gray-4); background: none; border: none; cursor: pointer; border-bottom: 2px solid transparent; transition: all 0.15s; }
.tab:hover { color: var(--black); }
.tab.active { color: var(--black); background: var(--white); border-bottom-color: var(--black); }

.panel { padding: 1.5rem; }
.field-label { display: block; font-size: 12px; font-weight: 500; color: var(--gray-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
textarea { width: 100%; font-family: var(--font); font-size: 14px; color: var(--black); background: var(--gray-7); border: 1px solid var(--gray-6); border-radius: var(--radius-md); padding: 12px 14px; resize: none; line-height: 1.6; transition: border-color 0.15s; }
textarea:focus { outline: none; border-color: var(--gray-4); background: var(--white); }
textarea::placeholder { color: var(--gray-5); }

.panel-footer { display: flex; align-items: center; gap: 10px; margin-top: 12px; }
.primary-btn { display: inline-flex; align-items: center; gap: 7px; padding: 9px 18px; font-size: 13px; font-weight: 500; font-family: var(--font); color: var(--white); background: var(--black); border: none; border-radius: var(--radius-sm); cursor: pointer; transition: opacity 0.15s, transform 0.1s; }
.primary-btn:hover { opacity: 0.85; }
.primary-btn:active { transform: scale(0.98); }
.primary-btn:disabled { opacity: 0.35; cursor: not-allowed; }
.ghost-btn { font-size: 13px; font-family: var(--font); color: var(--gray-4); background: none; border: none; cursor: pointer; padding: 4px 0; transition: color 0.1s; }
.ghost-btn:hover { color: var(--black); }

.output-area { margin-top: 1.5rem; border-top: 1px solid var(--gray-6); padding-top: 1.25rem; }
.output-label { font-size: 11px; font-weight: 500; color: var(--gray-4); text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 12px; }

.history-item { padding: 12px 0; border-bottom: 1px solid var(--gray-6); }
.history-item:last-child { border-bottom: none; }
.history-q { font-size: 13px; font-weight: 500; color: var(--gray-4); margin-bottom: 8px; padding: 5px 10px; background: var(--gray-7); border-radius: var(--radius-sm); display: inline-block; }

.report-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.report-opt { display: flex; align-items: flex-start; gap: 10px; padding: 12px 14px; background: var(--gray-7); border: 1.5px solid var(--gray-6); border-radius: var(--radius-md); cursor: pointer; text-align: left; font-family: var(--font); transition: all 0.15s; }
.report-opt:hover { background: var(--white); border-color: var(--gray-4); }
.report-opt.selected { background: var(--white); border-color: var(--black); }
.opt-icon { color: var(--gray-3); margin-top: 1px; flex-shrink: 0; }
.report-opt strong { display: block; font-size: 13px; font-weight: 500; color: var(--black); margin-bottom: 2px; }
.report-opt small { display: block; font-size: 12px; color: var(--gray-4); }

.loading { display: inline-flex; gap: 4px; align-items: center; padding: 8px 0; }
.loading span { width: 5px; height: 5px; background: var(--gray-4); border-radius: 50%; animation: pulse 1.2s ease-in-out infinite; }
.loading span:nth-child(2) { animation-delay: 0.2s; }
.loading span:nth-child(3) { animation-delay: 0.4s; }
@keyframes pulse { 0%,80%,100%{opacity:0.2;transform:scale(0.8)} 40%{opacity:1;transform:scale(1)} }

.footer { text-align: center; padding: 1.5rem; font-size: 12px; color: var(--gray-5); border-top: 1px solid var(--gray-6); background: var(--white); }

.section-label-sm { font-size: 12px; font-weight: 500; color: var(--gray-3); text-transform: uppercase; letter-spacing: 0.06em; margin-bottom: 8px; }
.key-row { display: flex; gap: 8px; }
.key-row input { flex: 1; font-family: var(--font); font-size: 13px; padding: 9px 12px; border: 1px solid var(--gray-6); border-radius: var(--radius-sm); background: var(--gray-7); color: var(--black); outline: none; }
.key-row input:focus { border-color: var(--gray-4); background: var(--white); }
.save-key-btn { padding: 9px 16px; font-size: 13px; font-weight: 500; font-family: var(--font); color: var(--white); background: var(--black); border: none; border-radius: var(--radius-sm); cursor: pointer; white-space: nowrap; }
.save-key-btn:hover { opacity: 0.8; }
.key-hint { font-size: 12px; color: var(--gray-4); margin-top: 7px; }
.key-hint.ok { color: #2e7d32; }

/* Markdown rendering */
.output-text h1, .history-a h1 { font-size: 17px; font-weight: 600; color: var(--black); margin: 1.5rem 0 0.5rem; padding-bottom: 8px; border-bottom: 2px solid var(--gray-6); }
.output-text h2, .history-a h2 { font-size: 14px; font-weight: 600; color: var(--black); margin: 1.25rem 0 0.4rem; padding-left: 10px; border-left: 3px solid var(--black); }
.output-text h3, .history-a h3 { font-size: 13px; font-weight: 600; color: var(--gray-1); margin: 1rem 0 0.3rem; }
.output-text h4, .history-a h4 { font-size: 12px; font-weight: 600; color: var(--gray-3); margin: 0.75rem 0 0.25rem; text-transform: uppercase; letter-spacing: 0.04em; }
.output-text p, .history-a p { font-size: 14px; line-height: 1.8; color: var(--black); margin: 0.3rem 0; }
.output-text li, .history-a li { font-size: 14px; line-height: 1.7; color: var(--black); margin: 0.25rem 0 0.25rem 1.25rem; list-style: disc; }
.output-text strong, .history-a strong { font-weight: 600; color: var(--black); }
.output-text em, .history-a em { font-style: italic; color: var(--gray-2); }
.output-text hr, .history-a hr { border: none; border-top: 1px solid var(--gray-6); margin: 1.25rem 0; }
.output-text blockquote, .history-a blockquote { border-left: 3px solid var(--gray-5); padding: 8px 14px; background: var(--gray-7); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; margin: 0.75rem 0; font-size: 13px; color: var(--gray-2); }
.spacer { height: 6px; }

.table-wrap { overflow-x: auto; margin: 0.75rem 0; border-radius: var(--radius-md); border: 1px solid var(--gray-6); }
.table-wrap table { width: 100%; border-collapse: collapse; font-size: 13px; }
.table-wrap thead th { background: var(--gray-1); color: var(--white); font-weight: 600; padding: 9px 12px; text-align: left; white-space: nowrap; }
.table-wrap tbody td { padding: 8px 12px; border-bottom: 1px solid var(--gray-6); color: var(--black); vertical-align: top; }
.table-wrap tbody tr:last-child td { border-bottom: none; }
.table-wrap tbody tr:nth-child(even) td { background: var(--gray-7); }

.badge-green { color: #2e7d32; font-size: 15px; }
.badge-yellow { color: #e65100; font-size: 15px; }
.badge-red { color: #c62828; font-size: 15px; }

@media (max-width: 520px) {
  .main { padding: 1.5rem 1rem 2rem; }
  .report-grid { grid-template-columns: 1fr; }
  .hero-title { font-size: 26px; }
}