/* ============================================
   LABERINTO LITERARIO — design tokens
   ============================================ */
:root {
  /* paleta */
  --color-paper: #FBF8F2;
  --color-paper-raised: #FFFFFF;
  --color-ink: #241F1C;
  --color-ink-soft: #5C5650;
  --color-line: #D9D2C5;
  --color-thread: #B23A2E;       /* hilo de Ariadna — acento primario */
  --color-thread-dark: #8E2C22;
  --color-leaf: #3D5A40;          /* verde lectura — acento secundario */
  --color-gold: #C08A28;          /* primer puesto */
  --color-error: #A8311F;
  --color-error-bg: #FBEAE6;

  /* tipografía */
  --font-display: 'Fraunces', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Space Mono', 'Courier New', monospace;

  /* espaciado */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --space-6: 3rem;

  /* radios y bordes: deliberadamente angulosos, estilo ficha catalográfica */
  --radius-sm: 3px;
  --radius-md: 6px;
  --border-thin: 1px solid var(--color-line);

  --shadow-card: 0 1px 2px rgba(36, 31, 28, 0.04), 0 4px 12px rgba(36, 31, 28, 0.06);
  --max-width: 640px;
}

* {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  background-color: var(--color-paper);
  color: var(--color-ink);
  line-height: 1.5;
  min-height: 100vh;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.hidden {
  display: none !important;
}

/* ============================================
   Accesibilidad: foco visible y motion reducido
   ============================================ */
:focus-visible {
  outline: 2px solid var(--color-thread);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

a:focus,
button:focus,
input:focus,
[tabindex]:focus {
  outline: none;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-2) var(--space-3);
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}

.skip-link:focus {
  left: 0;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================
   Header — el hilo del laberinto
   ============================================ */
.site-header {
  background-color: var(--color-ink);
  color: var(--color-paper);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 400 80' preserveAspectRatio='none'%3E%3Cpath d='M0 60 L40 60 L40 20 L80 20 L80 70 L130 70 L130 10 L170 10 L170 50 L220 50 L220 30 L270 30 L270 65 L320 65 L320 15 L360 15 L360 45 L400 45' fill='none' stroke='%23B23A2E' stroke-width='2' opacity='0.45'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: bottom;
  background-size: cover;
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-5) var(--space-4) var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.brand__mark {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  color: var(--color-thread);
}

.brand__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.6rem;
  margin: 0;
  letter-spacing: -0.01em;
}

.brand__tagline {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-line);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding-left: calc(28px + var(--space-2));
}

/* ============================================
   Layout general
   ============================================ */
main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

/* ============================================
   Cards — fichas catalográficas
   ============================================ */
.card {
  background-color: var(--color-paper-raised);
  border: var(--border-thin);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
}

.card--auth {
  margin-top: var(--space-5);
}

.card--form,
.card--list,
.card--chat {
  display: flex;
  flex-direction: column;
}

.field--nick {
  transition: opacity 0.15s ease;
}

.card__title {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0 0 var(--space-2);
}

.card__title--small {
  font-size: 1.15rem;
  margin-bottom: var(--space-3);
}

.card__lead {
  color: var(--color-ink-soft);
  margin: 0 0 var(--space-4);
}

/* ============================================
   Pantalla de carga
   ============================================ */
.state-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-4);
  color: var(--color-ink-soft);
}

.spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-line);
  border-top-color: var(--color-thread);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Formularios
   ============================================ */
.field {
  margin-bottom: var(--space-3);
  display: flex;
  flex-direction: column;
}

.field label {
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: var(--space-1);
  color: var(--color-ink);
}

.field input {
  font-family: var(--font-body);
  font-size: 1rem;
  padding: 0.65rem 0.75rem;
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  background-color: var(--color-paper);
  color: var(--color-ink);
  width: 100%;
  min-height: 44px; /* objetivo táctil accesible */
}

.field input:focus {
  border-color: var(--color-thread);
  background-color: var(--color-paper-raised);
}

.field input.has-error {
  border-color: var(--color-error);
}

.field__hint {
  font-size: 0.78rem;
  color: var(--color-ink-soft);
  margin: var(--space-1) 0 0;
}

.field-row {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
}

.field-row .field {
  flex: 1 1 140px;
}

.field__password {
  position: relative;
  display: flex;
}

.field__password input {
  padding-right: 2.75rem;
}

.field__toggle {
  position: absolute;
  right: 4px;
  top: 4px;
  bottom: 4px;
  width: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: none;
  color: var(--color-ink-soft);
  cursor: pointer;
  border-radius: var(--radius-sm);
}

.field__toggle svg {
  width: 20px;
  height: 20px;
}

.field__toggle[aria-pressed="true"] {
  color: var(--color-thread);
}

.field--actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

/* ============================================
   Botones
   ============================================ */
.btn {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius-sm);
  border: var(--border-thin);
  cursor: pointer;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.1s ease;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn--primary:hover {
  background-color: var(--color-thread-dark);
}

.btn--primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn--ghost {
  background-color: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn--ghost:hover {
  border-color: var(--color-ink-soft);
  background-color: var(--color-paper);
}

.btn--link {
  background: none;
  border: none;
  color: var(--color-thread);
  text-decoration: underline;
  padding: 0.5rem;
}

.btn--full {
  width: 100%;
}

.btn--small {
  padding: 0.4rem 0.8rem;
  min-height: 36px;
  font-size: 0.82rem;
}

.btn--logout {
  width: 100%;
  margin-top: var(--space-2);
}

.btn__spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

/* ============================================
   Alertas / errores
   ============================================ */
.alert {
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  margin-bottom: var(--space-3);
}

.alert--error {
  background-color: var(--color-error-bg);
  color: var(--color-error);
  border: 1px solid #E8C3BB;
}

/* ============================================
   Tabs
   ============================================ */
.tabs {
  display: flex;
  gap: var(--space-2);
  border-bottom: var(--border-thin);
  position: sticky;
  top: 0;
  background-color: var(--color-paper);
  z-index: 10;
  padding-top: var(--space-1);
}

.tabs__btn {
  flex: 1;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  padding: var(--space-3) var(--space-2);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  cursor: pointer;
  min-height: 44px;
}

.tabs__btn.is-active {
  color: var(--color-thread);
  border-bottom-color: var(--color-thread);
}

.tab-panel {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding-top: var(--space-2);
}

/* ============================================
   Período de competencia
   ============================================ */
.card--periodo {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  background-color: var(--color-ink);
  color: var(--color-paper);
  border-color: var(--color-ink);
}

.periodo__etiqueta {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-line);
  margin: 0 0 var(--space-1);
}

.periodo__info {
  min-width: 0;
  flex: 1;
}

.periodo__fechas {
  font-family: var(--font-mono);
  margin: 0;
  font-size: 0.95rem;
}

.card--periodo .btn--ghost {
  border-color: rgba(251, 248, 242, 0.3);
  color: var(--color-paper);
  flex-shrink: 0;
}

/* ============================================
   Estadísticas
   ============================================ */
.card--stats {
  text-align: center;
}

.stats__etiqueta {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-ink-soft);
  margin: 0;
}

.stats__numero {
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 700;
  color: var(--color-thread);
  margin: var(--space-1) 0;
  line-height: 1;
}

.stats__detalle {
  font-size: 0.85rem;
  color: var(--color-ink-soft);
  margin: 0;
}

/* ============================================
   Lista de libros
   ============================================ */
.book-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.book-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  background-color: var(--color-paper);
}

.book-item__puntos {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-leaf);
  min-width: 3ch;
  text-align: right;
  flex-shrink: 0;
}

.book-item__info {
  flex: 1;
  min-width: 0;
}

.book-item__titulo {
  font-weight: 600;
  margin: 0;
  overflow-wrap: anywhere;
}

.book-item__meta {
  font-size: 0.8rem;
  color: var(--color-ink-soft);
  margin: 0;
}

.book-item__eliminar {
  background: none;
  border: none;
  color: var(--color-ink-soft);
  cursor: pointer;
  padding: var(--space-2);
  flex-shrink: 0;
  min-width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
}

.book-item__eliminar:hover {
  color: var(--color-error);
  background-color: var(--color-error-bg);
}

.book-item__eliminar svg {
  width: 18px;
  height: 18px;
}

/* ============================================
   Clasificación
   ============================================ */
.rank-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.rank-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  border: var(--border-thin);
  border-radius: var(--radius-sm);
}

.rank-item--1 {
  border-color: var(--color-gold);
  background: linear-gradient(to right, rgba(192, 138, 40, 0.08), transparent);
}

.rank-item__puesto {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1rem;
  width: 2rem;
  text-align: center;
  flex-shrink: 0;
  color: var(--color-ink-soft);
}

.rank-item--1 .rank-item__puesto {
  color: var(--color-gold);
}

.rank-item__nombre {
  flex: 1;
  font-weight: 600;
  margin: 0;
  overflow-wrap: anywhere;
}

.rank-item__puntos {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--color-thread);
  flex-shrink: 0;
}

/* ============================================
   Chat
   ============================================ */
.chat-box {
  height: 240px;
  overflow-y: auto;
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  padding: var(--space-3);
  margin-bottom: var(--space-3);
  background-color: var(--color-paper);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.chat-msg {
  font-size: 0.9rem;
  line-height: 1.4;
}

.chat-msg__nick {
  font-weight: 700;
  color: var(--color-leaf);
}

.chat-msg__hora {
  font-size: 0.72rem;
  color: var(--color-ink-soft);
  display: block;
}

.chat-form {
  display: flex;
  gap: var(--space-2);
}

.chat-form input {
  flex: 1;
  font-family: var(--font-body);
  padding: 0.65rem 0.75rem;
  border: var(--border-thin);
  border-radius: var(--radius-sm);
  min-height: 44px;
}

.chat-form .btn {
  flex-shrink: 0;
  padding: 0.65rem;
  width: 44px;
}

.chat-form .btn svg {
  width: 20px;
  height: 20px;
}

/* ============================================
   Estado vacío
   ============================================ */
.empty-state {
  text-align: center;
  color: var(--color-ink-soft);
  font-size: 0.9rem;
  padding: var(--space-4) var(--space-2);
  margin: 0;
}

/* ============================================
   Toasts
   ============================================ */
.toast-region {
  position: fixed;
  bottom: var(--space-4);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 1000;
  width: calc(100% - 2 * var(--space-4));
  max-width: 480px;
  align-items: center;
}

.toast {
  background-color: var(--color-ink);
  color: var(--color-paper);
  padding: var(--space-3);
  border-radius: var(--radius-sm);
  font-size: 0.88rem;
  box-shadow: var(--shadow-card);
  width: 100%;
  text-align: center;
  animation: toast-in 0.2s ease-out;
}

.toast--success {
  background-color: var(--color-leaf);
}

.toast--error {
  background-color: var(--color-error);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  max-width: var(--max-width);
  margin: var(--space-6) auto 0;
  padding: var(--space-4);
  border-top: var(--border-thin);
  text-align: center;
}

.site-footer__credito {
  margin: 0 0 var(--space-2);
  font-size: 0.9rem;
}

.site-footer__credito strong {
  font-family: var(--font-display);
  color: var(--color-thread);
}

.site-footer__texto {
  font-size: 0.82rem;
  color: var(--color-ink-soft);
  max-width: 480px;
  margin: 0 auto;
}

/* ============================================
   Responsive: desde mobile hacia arriba
   ============================================ */
@media (min-width: 600px) {
  .brand__title {
    font-size: 1.9rem;
  }

  .card {
    padding: var(--space-5);
  }

  .field--actions {
    flex-direction: row;
  }

  .stats__numero {
    font-size: 3.8rem;
  }
}

/* Pantallas muy angostas */
@media (max-width: 360px) {
  main {
    padding: var(--space-3);
  }

  .card {
    padding: var(--space-3);
  }
}

/* Notch / safe areas para cuando se empaquete como app nativa */
@supports (padding: max(0px)) {
  .site-header__inner {
    padding-top: max(var(--space-5), env(safe-area-inset-top));
  }

  main {
    padding-bottom: max(var(--space-4), env(safe-area-inset-bottom));
  }
}