/* ============================================================================
   LETRAS DEL ALMA - CORE STYLES v2.0
   Sistema de diseño completamente renovado con temas consistentes
   ============================================================================ */

/* ==========================================
   VARIABLES BASE - Colores fijos
   ========================================== */
:root {
  /* Paleta de Colores Principales - No cambian entre temas */
  --accent-burgundy: #9b2c2c;
  --accent-burgundy-hover: #7c2d12;
  --accent-gold: #d4af37;
  --accent-gold-hover: #b8941f;
  --accent-sage: #87a96b;
  --accent-slate: #5a7d9a;
  
  /* Colores Semánticos */
  --success: #2ecc71;
  --error: #e74c3c;
  --warning: #f39c12;
  --info: #3498db;
  
  /* Tipografía */
  --font-serif: 'Crimson Pro', 'Georgia', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  
  /* Tamaños de Fuente */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  
  /* Espaciado */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  
  /* Sombras */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.25);
  
  /* Bordes */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Transiciones */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* ==========================================
   TEMA CLARO (por defecto)
   ========================================== */
:root,
:root[data-theme="light"] {
  /* Fondos */
  --bg-primary: #f5f2ed;
  --bg-secondary: #fafafa;
  --bg-elevated: #ffffff;
  --bg-hover: #f3f4f6;
  
  /* Textos */
  --text-primary: #1a1a1a;
  --text-secondary: #4a4a4a;
  --text-tertiary: #6a6a6a;
  --text-quaternary: #9ca3af;
  
  /* Bordes */
  --border-color: #d1d5db;
  --border-light: #e5e7eb;
  --border-strong: #9ca3af;
  
  /* Overlays */
  --overlay-bg: rgba(0, 0, 0, 0.4);
  --overlay-light: rgba(0, 0, 0, 0.1);
  
  /* Input backgrounds */
  --input-bg: #ffffff;
  --input-bg-focus: #ffffff;
  --input-border: #d1d5db;
  --input-border-focus: var(--accent-burgundy);
  
  /* Card & Component backgrounds */
  --card-bg: #ffffff;
  --card-bg-hover: #fafafa;
  --card-border: #e5e7eb;
  
  /* Button backgrounds */
  --btn-bg: #ffffff;
  --btn-bg-hover: #f3f4f6;
  --btn-border: #d1d5db;
  
  /* Specific components */
  --navbar-bg: rgba(255, 255, 255, 0.95);
  --modal-bg: #ffffff;
  --sidebar-bg: #ffffff;
  --panel-bg: #fafafa;
  
  /* Scrollbar */
  --scrollbar-track: #f3f4f6;
  --scrollbar-thumb: var(--accent-burgundy);
  --scrollbar-thumb-hover: var(--accent-gold);
}

/* ==========================================
   TEMA OSCURO
   ========================================== */
:root[data-theme="dark"] {
  /* Fondos */
  --bg-primary: #0f0f0f;
  --bg-secondary: #1a1a1a;
  --bg-elevated: #242424;
  --bg-hover: #2d2d2d;
  
  /* Textos */
  --text-primary: #f5f2ed;
  --text-secondary: #d1d5db;
  --text-tertiary: #9ca3af;
  --text-quaternary: #6b7280;
  
  /* Bordes */
  --border-color: #374151;
  --border-light: #2d2d2d;
  --border-strong: #4b5563;
  
  /* Overlays */
  --overlay-bg: rgba(0, 0, 0, 0.7);
  --overlay-light: rgba(0, 0, 0, 0.3);
  
  /* Input backgrounds */
  --input-bg: #1a1a1a;
  --input-bg-focus: #242424;
  --input-border: #374151;
  --input-border-focus: var(--accent-burgundy);
  
  /* Card & Component backgrounds */
  --card-bg: #1a1a1a;
  --card-bg-hover: #242424;
  --card-border: #2d2d2d;
  
  /* Button backgrounds */
  --btn-bg: #1a1a1a;
  --btn-bg-hover: #242424;
  --btn-border: #374151;
  
  /* Specific components */
  --navbar-bg: rgba(26, 26, 26, 0.95);
  --modal-bg: #1a1a1a;
  --sidebar-bg: #1a1a1a;
  --panel-bg: #0f0f0f;
  
  /* Scrollbar */
  --scrollbar-track: #1a1a1a;
  --scrollbar-thumb: var(--accent-burgundy);
  --scrollbar-thumb-hover: var(--accent-gold);
  
  /* Ajustes en sombras para modo oscuro */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.6);
  --shadow-2xl: 0 25px 50px rgba(0, 0, 0, 0.8);
}

/* ==========================================
   RESET Y BASE
   ========================================== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--text-primary);
  background: var(--bg-primary);
  transition: background var(--transition-smooth), color var(--transition-smooth);
  overflow-x: hidden;
}

/* ==========================================
   TIPOGRAFÍA
   ========================================== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

p {
  margin-bottom: var(--space-4);
  color: var(--text-secondary);
}

a {
  color: var(--accent-burgundy);
  text-decoration: none;
  transition: color var(--transition-base);
}

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

strong, b {
  font-weight: 600;
  color: var(--text-primary);
}

em, i {
  font-style: italic;
}

/* ==========================================
   SCROLL PERSONALIZADO
   ========================================== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}

::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

/* ==========================================
   SELECCIÓN DE TEXTO
   ========================================== */
::selection {
  background: var(--accent-burgundy);
  color: white;
}

::-moz-selection {
  background: var(--accent-burgundy);
  color: white;
}

/* ==========================================
   UTILIDADES
   ========================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.font-sans { font-family: var(--font-sans); }
.font-serif { font-family: var(--font-serif); }
.font-display { font-family: var(--font-display); }

.hidden { display: none !important; }
.invisible { visibility: hidden !important; }

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

/* ==========================================
   RESPONSIVE
   ========================================== */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-3xl); }
  h3 { font-size: var(--text-2xl); }
}

/* ==========================================
   NAVEGACIÓN PRINCIPAL
   ========================================== */
.main-nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--navbar-bg);
  border-bottom: 2px solid var(--border-color);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: all var(--transition-base);
}

.nav-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--accent-burgundy);
  cursor: pointer;
  transition: transform var(--transition-base);
}

.nav-brand:hover {
  transform: scale(1.05);
}

.nav-brand i {
  font-size: var(--text-2xl);
  color: var(--accent-gold);
}

.brand-text {
  background: linear-gradient(135deg, var(--accent-burgundy), var(--accent-gold));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* Wrapper que apila título y autor verticalmente */
.brand-stack {
  display: flex;
  flex-direction: column;
  gap: 0;
  line-height: 1;
}

/* Nombre del autor — pequeño, discreto, debajo del título */
.brand-author {
  font-size: 0.72rem;
  font-family: var(--font-sans, 'Inter', sans-serif);
  font-weight: 400;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  -webkit-text-fill-color: var(--text-tertiary);
  opacity: 0.7;
  margin-top: 2px;
}

.nav-center {
  display: flex;
  gap: var(--space-2);
  flex: 1;
  justify-content: center;
  max-width: 600px;
}

.nav-filter-btn {
  padding: var(--space-3) var(--space-5);
  border: 2px solid var(--border-color);
  background: var(--btn-bg);
  border-radius: var(--radius-full);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  transition: all var(--transition-base);
  white-space: nowrap;
}

.nav-filter-btn:hover {
  border-color: var(--accent-burgundy);
  color: var(--accent-burgundy);
  background: var(--btn-bg-hover);
  transform: translateY(-2px);
}

.nav-filter-btn.active {
  background: linear-gradient(135deg, var(--accent-burgundy), var(--accent-gold));
  border-color: transparent;
  color: white;
  box-shadow: var(--shadow-md);
}

.nav-filter-btn i {
  font-size: var(--text-base);
}

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

.nav-icon-btn {
  width: 44px;
  height: 44px;
  border: 2px solid var(--border-color);
  background: var(--btn-bg);
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: var(--text-lg);
  transition: all var(--transition-base);
  position: relative;
  overflow: visible;
}

.nav-icon-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, var(--accent-burgundy), var(--accent-gold));
  opacity: 0;
  transition: opacity var(--transition-base);
  border-radius: var(--radius-full);
}

.nav-icon-btn:hover {
  transform: translateY(-2px) scale(1.05);
  box-shadow: var(--shadow-md);
  border-color: transparent;
  color: white;
}

.nav-icon-btn:hover::before {
  opacity: 1;
}

.nav-icon-btn i {
  position: relative;
  z-index: 1;
}

/* ==========================================
   BOTÓN DE USUARIO — ESTADO LOGUEADO
   Avatar con borde gradiente + punto verde
   ========================================== */
.nav-icon-btn.nav-user-logged {
  padding: 0;
  border: 2.5px solid transparent;
  background-image: linear-gradient(var(--btn-bg), var(--btn-bg)),
                    linear-gradient(135deg, var(--accent-burgundy), var(--accent-gold));
  background-origin: border-box;
  background-clip: padding-box, border-box;
  overflow: visible;
}

.nav-icon-btn.nav-user-logged::before {
  display: none;
}

.nav-icon-btn.nav-user-logged:hover {
  transform: translateY(-2px) scale(1.08);
  box-shadow: 0 4px 16px rgba(155, 44, 44, 0.35);
  border-color: transparent;
}

.nav-user-avatar {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.nav-user-initial {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-burgundy), var(--accent-gold));
  color: white;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 700;
}

.nav-user-dot {
  position: absolute;
  bottom: 1px;
  right: 1px;
  width: 10px;
  height: 10px;
  background: #22c55e;
  border-radius: 50%;
  border: 2px solid var(--btn-bg);
  z-index: 2;
  box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4);
  animation: dotPulse 2.5s ease-in-out infinite;
}

@keyframes dotPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
  50%      { box-shadow: 0 0 0 4px rgba(34, 197, 94, 0); }
}

/* Mobile Navigation */
@media (max-width: 768px) {
  .nav-container {
    padding: var(--space-3) var(--space-4);
    gap: var(--space-4);
  }
  
  .brand-text,
  .brand-author {
    display: none;
  }
  
  .nav-center {
    display: none;
  }
  
  .nav-filter-btn span {
    display: none;
  }
  
  .nav-icon-btn {
    width: 40px;
    height: 40px;
    font-size: var(--text-base);
  }
  
  .nav-user-dot {
    width: 9px;
    height: 9px;
    bottom: 0;
    right: 0;
  }
}

/* ==========================================
   BARRA DE BÚSQUEDA
   ========================================== */
.search-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  background: var(--navbar-bg);
  border-bottom: 2px solid var(--border-color);
  padding: var(--space-6);
  transform: translateY(-100%);
  opacity: 0;
  transition: all var(--transition-smooth);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.search-bar.active {
  transform: translateY(0);
  opacity: 1;
}

.search-container {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.search-icon {
  position: absolute;
  left: var(--space-5);
  color: var(--text-tertiary);
  font-size: var(--text-xl);
  pointer-events: none;
}

.search-input {
  flex: 1;
  padding: var(--space-4) var(--space-5) var(--space-4) var(--space-12);
  border: 2px solid var(--input-border);
  background: var(--input-bg);
  border-radius: var(--radius-xl);
  font-family: var(--font-sans);
  font-size: var(--text-lg);
  color: var(--text-primary);
  transition: all var(--transition-base);
}

.search-input:focus {
  outline: none;
  border-color: var(--input-border-focus);
  background: var(--input-bg-focus);
  box-shadow: 0 0 0 4px rgba(155, 44, 44, 0.1);
}

.search-input::placeholder {
  color: var(--text-tertiary);
}

.search-close {
  width: 44px;
  height: 44px;
  border: none;
  background: var(--accent-burgundy);
  color: white;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  transition: all var(--transition-base);
}

.search-close:hover {
  background: var(--accent-gold);
  transform: rotate(90deg) scale(1.1);
}

@media (max-width: 768px) {
  .search-bar {
    padding: var(--space-4);
  }
  
  .search-input {
    font-size: var(--text-base);
    padding: var(--space-3) var(--space-4) var(--space-3) var(--space-10);
  }
  
  .search-icon {
    left: var(--space-4);
    font-size: var(--text-lg);
  }
}