/* Alemán Simultáneo — hoja de estilos (§9)
   Fondos slate-50, tarjetas blancas, acentos ámbar-600, animaciones CSS puras. */

:root {
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;
  --amber-50: #fffbeb;
  --amber-100: #fef3c7;
  --amber-200: #fde68a;
  --amber-500: #f59e0b;
  --amber-600: #d97706;
  --amber-700: #b45309;
  --red-50: #fef2f2;
  --red-200: #fecaca;
  --red-600: #dc2626;
  --red-700: #b91c1c;
  --green-600: #16a34a;
  --purple-500: #a855f7;
  --purple-600: #9333ea;
  --purple-50: #faf5ff;
  --card-border: rgba(226, 232, 240, 0.6);
  --shadow-card: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 4px 12px rgba(15, 23, 42, 0.08);
  --font-sans: ui-sans-serif, system-ui, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "Cascadia Mono", Consolas, Menlo, monospace;
  --radius: 12px;
}

* { box-sizing: border-box; }

/* El atributo hidden debe ganar siempre a cualquier display de clase. */
[hidden] { display: none !important; }

html, body {
  margin: 0;
  padding: 0;
}

body {
  background: var(--slate-50);
  color: var(--slate-800);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.55;
  min-height: 100vh;
}

button { font-family: inherit; cursor: pointer; }
button:disabled { cursor: not-allowed; opacity: 0.55; }

/* ============ Cabecera ============ */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  max-width: 1280px;
  margin: 0 auto;
  padding: 20px 24px 8px;
}

.brand { display: flex; align-items: center; gap: 12px; }
.logo svg { display: block; border-radius: 8px; }
.brand-text h1 { margin: 0; font-size: 21px; letter-spacing: -0.02em; color: var(--slate-900); }
.brand-text p { margin: 0; font-size: 13px; color: var(--slate-500); }

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

.btn-ghost {
  display: inline-flex; align-items: center; gap: 7px;
  background: #fff; color: var(--slate-600);
  border: 1px solid var(--slate-200);
  border-radius: 9px; padding: 8px 14px; font-size: 13.5px; font-weight: 500;
  transition: border-color 0.15s, color 0.15s, box-shadow 0.15s;
}
.btn-ghost:hover:not(:disabled) { border-color: var(--slate-300); color: var(--slate-800); box-shadow: var(--shadow-card); }

/* Toggle Modo Dev: se tiñe de púrpura con piloto pulsante al activarse (§4.1) */
.btn-dev {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: var(--slate-500);
  border: 1px solid var(--slate-200);
  border-radius: 9px; padding: 8px 14px; font-size: 13.5px; font-weight: 600;
  transition: background 0.25s, color 0.25s, border-color 0.25s, box-shadow 0.25s;
}
.dev-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--slate-300);
  transition: background 0.25s;
}
.btn-dev.active {
  background: var(--purple-600); border-color: var(--purple-600); color: #fff;
  box-shadow: 0 2px 10px rgba(147, 51, 234, 0.35);
}
.btn-dev.active .dev-dot {
  background: #e9d5ff;
  animation: dev-pulse 1.4s ease-in-out infinite;
}
@keyframes dev-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(233, 213, 255, 0.7); }
  50% { box-shadow: 0 0 0 5px rgba(233, 213, 255, 0); }
}

/* ============ Panel de Ajustes ============ */

.settings-backdrop {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(15, 23, 42, 0.35);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 80px 16px 16px;
}
.settings-panel { width: 100%; max-width: 460px; padding: 22px; }
.settings-head { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.settings-head h2 { margin: 0; font-size: 17px; color: var(--slate-900); }
.btn-icon {
  background: none; border: none; color: var(--slate-400);
  font-size: 15px; padding: 4px 8px; border-radius: 6px;
}
.btn-icon:hover { color: var(--slate-700); background: var(--slate-100); }
.settings-label { display: block; font-size: 13px; font-weight: 600; color: var(--slate-600); margin-bottom: 6px; }
#api-key-input {
  width: 100%; padding: 10px 12px; border: 1px solid var(--slate-200);
  border-radius: 8px; font-family: var(--font-mono); font-size: 13px;
  color: var(--slate-800); background: var(--slate-50);
}
#api-key-input:focus { outline: 2px solid var(--amber-200); border-color: var(--amber-500); }
.settings-note {
  font-size: 12.5px; color: var(--slate-500); background: var(--amber-50);
  border: 1px solid var(--amber-100); border-radius: 8px; padding: 10px 12px; margin: 12px 0;
}
.settings-note code { font-family: var(--font-mono); font-size: 11.5px; }
.settings-actions { display: flex; gap: 10px; }
.settings-status { min-height: 18px; font-size: 12.5px; color: var(--green-600); margin: 10px 0 0; }

/* ============ Layout general ============ */

.layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: 20px;
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px 48px;
  align-items: start;
}
.col { display: flex; flex-direction: column; gap: 20px; min-width: 0; }

@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
}

.card {
  background: #fff;
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-card);
  padding: 20px;
}
.card-title {
  margin: 0 0 14px;
  font-size: 14px; font-weight: 700; letter-spacing: 0.02em;
  color: var(--slate-700);
  text-transform: uppercase;
}

/* ============ Estación de Traducción Dual ============ */

.station-panels { display: flex; flex-direction: column; gap: 18px; }
.station-divider { height: 1px; background: var(--slate-100); }

.panel-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 13.5px; font-weight: 700; color: var(--slate-700);
  margin-bottom: 8px;
}
.flag { font-size: 16px; }

.textarea-wrap { position: relative; }
.station textarea {
  width: 100%; resize: vertical; min-height: 92px;
  padding: 12px 38px 12px 14px;
  border: 1px solid var(--slate-200); border-radius: 10px;
  background: var(--slate-50);
  font-family: inherit; font-size: 14.5px; line-height: 1.5; color: var(--slate-800);
  transition: border-color 0.15s, box-shadow 0.15s;
}
.station textarea::placeholder { color: var(--slate-400); }
.station textarea:focus {
  outline: none; border-color: var(--amber-500);
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.12);
  background: #fff;
}
.station textarea:disabled { background: var(--slate-100); color: var(--slate-400); }

.btn-clear {
  position: absolute; top: 8px; right: 8px;
  width: 26px; height: 26px; border-radius: 50%;
  border: none; background: var(--slate-200); color: var(--slate-600);
  font-size: 12px; line-height: 1;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.15s, color 0.15s;
}
.btn-clear:hover:not(:disabled) { background: var(--slate-300); color: var(--slate-800); }

.panel-foot {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 8px; gap: 12px;
}

.counter {
  font-family: var(--font-mono); font-size: 12px; color: var(--slate-400);
  transition: color 0.2s;
}
.counter.warn { color: var(--amber-600); font-weight: 600; }
.counter.limit { color: var(--red-600); font-weight: 700; }

.btn-primary {
  background: var(--amber-600); color: #fff;
  border: none; border-radius: 9px;
  padding: 9px 18px; font-size: 13.5px; font-weight: 600;
  transition: background 0.15s, box-shadow 0.15s, transform 0.1s;
}
.btn-primary:hover:not(:disabled) { background: var(--amber-700); box-shadow: 0 2px 8px rgba(217, 119, 6, 0.3); }
.btn-primary:active:not(:disabled) { transform: translateY(1px); }

/* ============ Frases Prediseñadas ============ */

.phrases { padding: 16px; }
.phrases .card-title { margin-bottom: 10px; }

.phrase-tabs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.phrase-tab {
  background: transparent; color: var(--slate-500);
  border: 1px solid var(--slate-200); border-radius: 999px;
  padding: 4px 10px; font-size: 12px; font-weight: 600;
  transition: background 0.15s, color 0.15s, border-color 0.15s;
}
.phrase-tab:hover:not(:disabled) { background: var(--slate-50); color: var(--slate-700); }
.phrase-tab.active { background: var(--slate-900); color: #fff; border-color: var(--slate-900); }

.phrase-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.phrase-card {
  display: block;
  width: 100%;
  text-align: left;
  background: #fff; border: 1px solid var(--slate-200);
  border-radius: 8px; padding: 8px 10px;
  transition: border-color 0.15s, background 0.15s;
}
.phrase-card:hover:not(:disabled) {
  border-color: var(--amber-500); background: var(--amber-50);
}
.phrase-de { display: block; font-weight: 650; font-size: 13px; color: var(--slate-800); }
.phrase-es { display: block; font-size: 12px; color: var(--slate-500); margin-top: 1px; }
.phrase-actions { display: flex; justify-content: flex-start; margin-top: 8px; }
.phrase-toggle {
  background: transparent;
  border: none;
  color: var(--amber-700);
  font-size: 12.5px;
  font-weight: 700;
  padding: 4px 2px;
}
.phrase-toggle:hover:not(:disabled) { color: var(--slate-900); }

/* ============ Historial ============ */

.history-list { display: flex; flex-direction: column; gap: 6px; }

.history-empty {
  text-align: center; padding: 26px 12px; color: var(--slate-400); font-size: 13.5px;
}
.history-empty .empty-art { font-size: 30px; display: block; margin-bottom: 8px; }

.history-row {
  display: flex; align-items: center; gap: 10px;
  width: 100%; text-align: left; cursor: pointer;
  background: none; border: 1px solid transparent; border-radius: 9px;
  padding: 8px 10px;
  transition: background 0.12s, border-color 0.12s;
}
.history-row:hover { background: var(--slate-50); border-color: var(--slate-200); }
.history-row:focus-visible { outline: 2px solid var(--amber-500); }

.dir-badge {
  flex: none;
  font-family: var(--font-mono); font-size: 10.5px; font-weight: 700;
  border-radius: 6px; padding: 3px 7px; letter-spacing: 0.03em;
}
.dir-badge.de { background: var(--amber-100); color: var(--amber-700); }
.dir-badge.rev { background: var(--slate-100); color: var(--slate-500); }

.history-text {
  flex: 1; min-width: 0;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  font-size: 13.5px; color: var(--slate-700);
}
.history-time { flex: none; font-family: var(--font-mono); font-size: 11.5px; color: var(--slate-400); }

.history-del {
  flex: none; width: 26px; height: 26px;
  border: none; border-radius: 6px; background: none;
  color: var(--slate-400); font-size: 13px;
  opacity: 0; transition: opacity 0.12s, background 0.12s, color 0.12s;
  display: flex; align-items: center; justify-content: center;
}
.history-row:hover .history-del { opacity: 1; }
.history-del:hover { background: var(--red-50); color: var(--red-600); }
@media (hover: none) { .history-del { opacity: 1; } }

/* ============ Ficha de Resultados ============ */

.results { min-height: 300px; }

@keyframes fade-up {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fade-up 0.35s ease-out both; }

/* Estado vacío */
.result-empty { text-align: center; padding: 56px 28px; }
.result-empty .empty-icon { font-size: 44px; display: block; margin-bottom: 14px; }
.result-empty h2 { margin: 0 0 8px; font-size: 19px; color: var(--slate-800); }
.result-empty p { margin: 0 auto; max-width: 380px; color: var(--slate-500); font-size: 14px; }
.ai-badge {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 20px; padding: 6px 14px;
  background: var(--amber-50); border: 1px solid var(--amber-200);
  color: var(--amber-700); border-radius: 999px;
  font-size: 12px; font-weight: 600;
}

/* Estado de carga */
.result-loading { text-align: center; padding: 64px 28px; color: var(--slate-500); }
.spinner {
  width: 36px; height: 36px; margin: 0 auto 16px;
  border: 3px solid var(--slate-200); border-top-color: var(--amber-600);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Tarjeta de error */
.result-error {
  background: var(--red-50); border-color: var(--red-200);
  padding: 24px;
}
.result-error .error-head { display: flex; align-items: center; gap: 10px; margin-bottom: 8px; }
.result-error .error-icon { font-size: 22px; }
.result-error h2 { margin: 0; font-size: 16.5px; color: var(--red-700); }
.result-error p { margin: 0 0 16px; color: var(--slate-700); font-size: 14px; }
.btn-retry {
  background: var(--red-600); color: #fff; border: none; border-radius: 9px;
  padding: 9px 18px; font-size: 13.5px; font-weight: 600;
  transition: background 0.15s;
}
.btn-retry:hover { background: var(--red-700); }

/* Apartado en línea para introducir la clave API desde la tarjeta de error */
.inline-key {
  background: #fff; border: 1px solid var(--amber-200); border-radius: 10px;
  padding: 14px; margin: 0 0 16px;
}
.inline-key-note { margin: 0 0 12px; font-size: 13px; color: var(--slate-600); }
.inline-key-row { display: flex; gap: 8px; flex-wrap: wrap; }
.inline-key-input {
  flex: 1 1 200px; min-width: 0; padding: 9px 11px;
  border: 1px solid var(--slate-200); border-radius: 8px;
  font-family: var(--font-mono); font-size: 13px;
  color: var(--slate-800); background: var(--slate-50);
}
.inline-key-input:focus { outline: 2px solid var(--amber-200); border-color: var(--amber-500); }
.inline-key-save { white-space: nowrap; }
.inline-key-status { min-height: 16px; font-size: 12.5px; color: var(--red-600); margin: 8px 0 0; }

.key-pulse { animation: key-pulse 0.45s ease; }
@keyframes key-pulse {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.05); }
  70%  { transform: scale(0.98); }
  100% { transform: scale(1); }
}

/* Resultado */
.result-head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; flex-wrap: wrap; margin-bottom: 16px;
}
.done-badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: #f0fdf4; border: 1px solid #bbf7d0; color: var(--green-600);
  border-radius: 999px; padding: 4px 12px; font-size: 12px; font-weight: 700;
}
.elapsed { font-family: var(--font-mono); font-size: 12.5px; color: var(--slate-400); }

.original-text { font-style: italic; color: var(--slate-400); font-size: 14px; margin: 0 0 6px; overflow-wrap: break-word; }

.translation-row { display: flex; align-items: flex-start; gap: 14px; }
.translation-main {
  flex: 1; min-width: 0;
  font-size: 23px; font-weight: 650; line-height: 1.35; color: var(--slate-900);
  margin: 0; overflow-wrap: break-word;
}

/* Botón de audio (§4.5) */
.btn-audio {
  flex: none;
  width: 44px; height: 44px; border-radius: 50%;
  border: 1px solid var(--slate-200); background: #fff; color: var(--slate-600);
  font-size: 18px; position: relative;
  display: flex; align-items: center; justify-content: center;
  transition: background 0.2s, color 0.2s, border-color 0.2s, transform 0.2s;
}
.btn-audio:hover:not(:disabled) { border-color: var(--amber-500); color: var(--amber-600); }
.btn-audio.speaking {
  background: var(--amber-600); border-color: var(--amber-600); color: #fff;
  transform: scale(1.08);
}
.btn-audio.speaking::before,
.btn-audio.speaking::after {
  content: ""; position: absolute; inset: -1px; border-radius: 50%;
  border: 2px solid var(--amber-500);
  animation: audio-wave 1.5s ease-out infinite;
}
.btn-audio.speaking::after { animation-delay: 0.5s; }
@keyframes audio-wave {
  from { transform: scale(1); opacity: 0.7; }
  to { transform: scale(1.7); opacity: 0; }
}

/* Secciones del análisis */
.result-section { margin-top: 20px; }
.section-title {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 10px; font-size: 13px; font-weight: 700;
  color: var(--slate-600); text-transform: uppercase; letter-spacing: 0.03em;
}
.section-title .s-icon { color: var(--amber-600); }

.pron-box {
  display: flex; align-items: center; gap: 12px;
  background: var(--slate-50); border: 1px solid var(--slate-200);
  border-radius: 10px; padding: 12px 16px;
  font-size: 16px; color: var(--slate-800);
}
.pron-box .pron-icon { font-size: 20px; flex: none; }

.grammar-list { margin: 0; padding: 0; list-style: none; }
.grammar-list li {
  position: relative; padding-left: 20px; margin-bottom: 8px;
  color: var(--slate-700); font-size: 14px;
}
.grammar-list li::before {
  content: ""; position: absolute; left: 4px; top: 8px;
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--amber-500);
}

.vocab-table-wrap { overflow-x: auto; }
.vocab-table { width: 100%; border-collapse: collapse; font-size: 14px; }
.vocab-table th {
  text-align: left; font-size: 11.5px; text-transform: uppercase; letter-spacing: 0.04em;
  color: var(--slate-400); font-weight: 700;
  padding: 6px 10px; border-bottom: 1px solid var(--slate-200);
}
.vocab-table td { padding: 8px 10px; border-bottom: 1px solid var(--slate-100); vertical-align: top; }
.vocab-de { color: var(--amber-600); font-weight: 700; }
.vocab-cat { font-style: italic; color: var(--slate-500); }

.alt-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.alt-chip {
  background: var(--amber-50); border: 1px solid var(--amber-200); color: var(--amber-700);
  border-radius: 999px; padding: 6px 14px; font-size: 13.5px; font-weight: 600;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
}
.alt-chip:hover:not(:disabled) {
  background: var(--amber-100); border-color: var(--amber-500);
  box-shadow: 0 1px 5px rgba(217, 119, 6, 0.2);
}

.example-cards { display: flex; flex-direction: column; gap: 10px; }
.example-card {
  background: var(--slate-50); border: 1px solid var(--slate-200);
  border-left: 3px solid var(--amber-500);
  border-radius: 10px; padding: 12px 14px;
}
.example-de { font-weight: 700; color: var(--slate-800); font-size: 14px; margin: 0; }
.example-es { font-style: italic; color: var(--slate-500); font-size: 13.5px; margin: 4px 0 0; }