/* ==========================================================================
   CARTA ESPECIAL - ESTILOS AUTÓNOMOS (PAPEL Y SOBRE DELICADO)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600&family=Newsreader:ital,opsz,wght@0,6..72,400;0,6..72,500;1,6..72,400;1,6..72,500&display=swap');

:root {
  --bg-dark: #0e0e10;
  --paper-bg: #1c1a18;
  --text-paper: #f0eae1;
  --text-muted: #8c857b;
  --accent-gold: #dfba7e;
  --border-paper: rgba(223, 186, 126, 0.2);

  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: 'Newsreader', Georgia, serif;
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-paper);
  font-family: var(--font-sans);
  min-height: 100vh;
  line-height: 1.7;
  overflow-x: hidden;
}

.back-to-store {
  position: fixed;
  top: 18px;
  left: 18px;
  z-index: 100;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-decoration: none;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 5px 12px;
  border-radius: 9999px;
  transition: all 0.2s ease;
}

.back-to-store:hover {
  color: #ffffff;
}

/* Audio pill */
.audio-pill {
  position: fixed;
  top: 18px;
  right: 18px;
  z-index: 100;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--text-paper);
  padding: 6px 14px;
  border-radius: 9999px;
  font-size: 0.78rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s;
}

.audio-pill.muted {
  opacity: 0.4;
  text-decoration: line-through;
}

/* Pantalla de Sobre */
.envelope-screen {
  position: fixed;
  inset: 0;
  background: var(--bg-dark);
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.8s ease;
}

.envelope-screen.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.envelope-mockup {
  width: 140px;
  height: 100px;
  background: #1c1a18;
  border: 1px solid var(--border-paper);
  border-radius: 12px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.6);
  position: relative;
}

.envelope-seal {
  font-size: 1.8rem;
  filter: drop-shadow(0 2px 6px rgba(0, 0, 0, 0.5));
}

.envelope-recipient {
  font-family: var(--font-serif);
  font-size: 2.2rem;
  font-style: italic;
  color: var(--accent-gold);
  margin-bottom: 6px;
}

.envelope-tagline {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 28px;
}

.btn-open-letter {
  background: var(--accent-gold);
  color: #12100e;
  border: none;
  padding: 12px 32px;
  border-radius: 9999px;
  font-size: 0.92rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.2s;
}

.btn-open-letter:active {
  transform: scale(0.96);
}

/* Carta Desplegada */
.letter-viewport {
  width: 100%;
  max-width: 440px;
  margin: 0 auto;
  padding: 50px 16px 80px;
}

.stationery-paper {
  background: var(--paper-bg);
  border: 1px solid var(--border-paper);
  border-radius: 20px;
  padding: 36px 24px 44px;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7);
  position: relative;
}

.letter-header {
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid rgba(223, 186, 126, 0.15);
}

.letter-date-top {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-gold);
  margin-bottom: 8px;
}

.letter-greeting {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 500;
  font-style: italic;
  color: #fff;
}

.letter-paragraphs {
  display: flex;
  flex-direction: column;
  gap: 18px;
  margin-bottom: 28px;
}

.letter-paragraphs p {
  font-family: var(--font-serif);
  font-size: 1.15rem;
  line-height: 1.8;
  color: var(--text-paper);
}

/* Foto Adjunta */
.letter-photo-card {
  margin: 28px 0;
  padding: 12px;
  background: #121110;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.letter-photo-card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  border-radius: 8px;
  display: block;
}

.letter-photo-caption {
  font-size: 0.8rem;
  color: var(--accent-gold);
  font-style: italic;
  text-align: center;
  margin-top: 8px;
}

/* Footer de la Carta */
.letter-footer {
  margin-top: 32px;
  padding-top: 18px;
  border-top: 1px solid rgba(223, 186, 126, 0.15);
}

.letter-closing {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-style: italic;
  color: var(--text-muted);
  margin-bottom: 6px;
}

.letter-sig {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-gold);
}