/* ============================================================
   OSE Interlinear Viewer — Shared Stylesheet
   ============================================================ */

:root {
  --bg:          #0f172a;
  --surface:     #1e293b;
  --surface-2:   #334155;
  --border:      #3f4f66;
  --accent:      #0ea5e9;
  --accent-2:    #a78bfa;
  --text:        #f1f5f9;
  --text-muted:  #94a3b8;
  --danger:      #f87171;
  --radius:      12px;
  --radius-sm:   7px;
  --shadow:      0 8px 40px rgba(0, 0, 0, 0.55);
  --glow:        0 0 22px rgba(14, 165, 233, 0.35);
  --transition:  0.18s ease;
  --font:        -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  --font-mono:   'SF Mono', 'Fira Code', 'Cascadia Code', Consolas, monospace;
  --card-width:  520px;
}

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

/* ---- Base ---- */
html { font-size: 15px; }
body {
  min-height: 100vh;
  background-color: var(--bg);
  background-image: radial-gradient(rgba(148, 163, 184, 0.06) 1px, transparent 1px);
  background-size: 28px 28px;
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
}

a { color: var(--accent); }

/* ---- Layout ---- */
.container {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 16px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 36px 40px;
  width: 100%;
  max-width: var(--card-width);
}

/* ---- Page header (export pages) ---- */
.page-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 28px;
}

.page-header-titles { flex: 1; }

.page-header h1 {
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.3;
}

.page-subtitle {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-top: 2px;
}

/* ---- App title (index page) ---- */
.app-logo {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--accent);
  margin-bottom: 10px;
  font-family: var(--font-mono);
}

.app-title {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.2;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 6px;
}

.app-description {
  color: var(--text-muted);
  font-size: 0.875rem;
  margin-bottom: 32px;
  line-height: 1.5;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 500;
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  border: 1px solid transparent;
  white-space: nowrap;
  text-decoration: none;
}

.btn:disabled { opacity: 0.4; cursor: not-allowed; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.btn-primary:hover:not(:disabled) {
  background: #38bdf8;
  box-shadow: var(--glow);
}

.btn-accent {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  padding: 10px 22px;
  font-size: 0.9375rem;
  font-weight: 600;
}
.btn-accent:hover:not(:disabled) {
  opacity: 0.88;
  box-shadow: 0 0 28px rgba(14, 165, 233, 0.45);
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn-secondary:hover:not(:disabled) {
  background: var(--surface-2);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border: none;
  padding: 6px 10px;
  font-size: 0.8125rem;
}
.btn-ghost:hover:not(:disabled) {
  color: var(--text);
  background: var(--surface-2);
}

/* ---- Format menu buttons (index page) ---- */
.format-menu {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.btn-format {
  display: flex;
  align-items: center;
  width: 100%;
  padding: 14px 18px;
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: var(--font);
  cursor: pointer;
  transition: all var(--transition);
  text-align: left;
  gap: 14px;
}
.btn-format:hover {
  background: rgba(14, 165, 233, 0.06);
  border-color: var(--accent);
  transform: translateX(3px);
  box-shadow: 0 0 18px rgba(14, 165, 233, 0.12);
}

.btn-format-icon {
  font-size: 1.4rem;
  flex-shrink: 0;
  line-height: 1;
}

.btn-format-text { flex: 1; }

.btn-format-name {
  display: block;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--text);
  transition: color var(--transition);
}
.btn-format:hover .btn-format-name { color: var(--accent); }

.btn-format-desc {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  font-weight: 400;
  margin-top: 1px;
}

.btn-format-arrow {
  color: var(--border);
  font-size: 1rem;
  transition: color var(--transition), transform var(--transition);
}
.btn-format:hover .btn-format-arrow {
  color: var(--accent);
  transform: translateX(2px);
}

/* ---- Forms ---- */
.form-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

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

.form-label {
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  width: 148px;
  text-align: right;
}

select, input[type="text"] {
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 12px;
  font-size: 0.875rem;
  font-family: var(--font);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

select:focus, input[type="text"]:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
}

select {
  flex: 1;
  min-width: 0;
  cursor: pointer;
  -webkit-appearance: none;
  appearance: none;
  padding-right: 30px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath fill='%2394a3b8' d='M5 6L0 0h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
}

input[type="text"] { flex: 1; }

/* ---- File row ---- */
.file-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

input[type="file"] {
  flex: 1;
  min-width: 0;
  font-size: 0.8125rem;
  color: var(--text-muted);
  font-family: var(--font);
  cursor: pointer;
}

/* Style the file input button in WebKit */
input[type="file"]::-webkit-file-upload-button {
  background: var(--surface-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 5px 12px;
  font-size: 0.8125rem;
  font-family: var(--font);
  cursor: pointer;
  margin-right: 8px;
  transition: all var(--transition);
}
input[type="file"]::-webkit-file-upload-button:hover {
  background: var(--surface);
  border-color: var(--accent);
  color: var(--accent);
}

/* ---- Inline note (replaces back-translation style dropdown for TSV) ---- */
.style-note {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  background: rgba(14, 165, 233, 0.07);
  border: 1px solid rgba(14, 165, 233, 0.2);
  border-radius: var(--radius-sm);
  font-size: 0.8125rem;
  color: var(--text-muted);
  flex: 1;
}

.style-note-badge {
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--accent);
  background: rgba(14, 165, 233, 0.15);
  border: 1px solid rgba(14, 165, 233, 0.3);
  padding: 2px 7px;
  border-radius: 99px;
  white-space: nowrap;
  flex-shrink: 0;
}

/* ---- Generate button row ---- */
.generate-row {
  margin-top: 22px;
  display: flex;
  justify-content: flex-end;
}

/* ---- Divider ---- */
.divider {
  border: none;
  border-top: 1px solid var(--border);
  margin: 20px 0;
}

/* ---- Browser warning ---- */
.browser-warning {
  background: rgba(239, 68, 68, 0.08);
  border: 1px solid rgba(239, 68, 68, 0.25);
  color: #fca5a5;
  border-radius: var(--radius-sm);
  padding: 10px 16px;
  font-size: 0.8125rem;
  width: 100%;
  max-width: var(--card-width);
  margin-bottom: 12px;
}
.browser-warning:empty { display: none; }
.browser-warning a { color: var(--danger); }

/* ---- Footer message ---- */
.app-message {
  color: var(--text-muted);
  font-size: 0.775rem;
  margin-top: 16px;
  text-align: center;
  max-width: var(--card-width);
  line-height: 1.5;
}
.app-message a { color: var(--accent); }

/* ---- Loaded options reveal animation ---- */
#loadedOptions:not([hidden]) {
  animation: slideIn 0.22s ease;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---- Filename row ---- */
.filename-suffix {
  color: var(--text-muted);
  font-size: 0.875rem;
  white-space: nowrap;
}