/* ---------------------------------------------------------------------
   DocuMind AI — visual system, per Design Document section 5
   Primary: #3B4FE0  Background: #FAFAFC  Surface: #FFFFFF
   Text primary: #1B1F27  Text secondary: #6B7280
   Success: #22C55E  Error: #EF4444
--------------------------------------------------------------------- */

:root {
  --color-primary: #3B4FE0;
  --color-primary-hover: #2F3FC4;
  --color-bg: #FAFAFC;
  --color-surface: #FFFFFF;
  --color-text: #1B1F27;
  --color-text-secondary: #6B7280;
  --color-success: #22C55E;
  --color-error: #EF4444;
  --color-border: #E4E5EC;
  --radius: 10px;
  --shadow-panel: 0 1px 2px rgba(27, 31, 39, 0.04), 0 4px 16px rgba(27, 31, 39, 0.05);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Focus visibility (Design Document section 6 — accessibility) */
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ---------------- Topbar ---------------- */

.topbar {
  padding: 28px 24px 20px;
  max-width: 1100px;
  margin: 0 auto;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.02em;
}

.brand-name {
  font-size: 20px;
  font-weight: 700;
}

.tagline {
  margin: 6px 0 0;
  color: var(--color-text-secondary);
  font-size: 15px;
}

/* ---------------- Layout ---------------- */

.layout {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

@media (min-width: 1024px) {
  .layout {
    flex-direction: row;
    align-items: flex-start;
  }
  .input-panel { flex: 0 0 40%; }
  .result-panel { flex: 0 0 60%; position: sticky; top: 24px; }
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-panel);
  padding: 20px;
}

/* ---------------- Upload zone ---------------- */

.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--color-primary);
  background: rgba(59, 79, 224, 0.04);
}

.upload-title {
  margin: 0 0 4px;
  font-weight: 600;
}

.upload-sub {
  margin: 0;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.file-name {
  margin: 10px 0 0;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-primary);
  word-break: break-all;
}

.or-divider {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 16px 0;
  color: var(--color-text-secondary);
  font-size: 13px;
}

.or-divider::before,
.or-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

#textInput {
  width: 100%;
  min-height: 90px;
  resize: vertical;
  padding: 12px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 14px;
  color: var(--color-text);
}

#textInput:focus-visible { outline-offset: 0; }

/* ---------------- Action bar ---------------- */

.actions {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
  margin-top: 16px;
}

.action-btn {
  padding: 10px 12px;
  border-radius: 8px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  font-family: inherit;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.1s ease, border-color 0.15s ease, background 0.15s ease;
}

.action-btn:hover { border-color: var(--color-primary); }
.action-btn:active { transform: scale(0.98); }

.action-btn.selected {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: #fff;
}

.sub-control {
  margin-top: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.sub-control label {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text-secondary);
}

.sub-control select,
.sub-control input {
  padding: 10px 12px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 14px;
  color: var(--color-text);
  background: var(--color-surface);
}

.run-btn {
  width: 100%;
  margin-top: 18px;
  padding: 13px;
  border: none;
  border-radius: 8px;
  background: var(--color-primary);
  color: #fff;
  font-family: inherit;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease, transform 0.1s ease;
}

.run-btn:hover:not(:disabled) { background: var(--color-primary-hover); }
.run-btn:active:not(:disabled) { transform: scale(0.99); }

.run-btn:disabled {
  background: var(--color-border);
  color: var(--color-text-secondary);
  cursor: not-allowed;
}

.error-banner {
  margin-top: 14px;
  padding: 10px 12px;
  border-radius: 8px;
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: var(--color-error);
  font-size: 14px;
}

/* ---------------- Result panel ---------------- */

.result-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.result-header h2 {
  margin: 0;
  font-size: 16px;
  font-weight: 600;
}

.result-actions {
  display: flex;
  gap: 8px;
}

.result-actions button {
  padding: 6px 12px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
}

.result-actions button:hover { border-color: var(--color-primary); }

.result-body {
  min-height: 260px;
  max-height: 60vh;
  overflow-y: auto;
  font-size: 15.5px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-wrap: break-word;
}

.result-body .placeholder {
  color: var(--color-text-secondary);
  font-style: italic;
}

.result-body.streaming::after {
  content: "▌";
  display: inline-block;
  color: var(--color-primary);
  animation: blink 1s step-start infinite;
}

@keyframes blink {
  50% { opacity: 0; }
}

@media (prefers-reduced-motion: reduce) {
  .result-body.streaming::after { animation: none; }
  * { transition: none !important; }
}

.loading-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.spinner {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  animation: spin 0.7s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ---------------- Responsive breakpoints (Design Document section 8) ---------------- */

@media (max-width: 479px) {
  .topbar { padding: 20px 16px 16px; }
  .layout { padding: 0 16px 32px; }
  .panel { padding: 16px; }
  .actions { grid-template-columns: 1fr; }
}