/* EnglishFlow - Design System & Global Styles */

:root {
  --bg-dark: #090e1a;
  --bg-card: #121a2c;
  --bg-card-hover: #192339;
  --bg-card-alt: #172136;
  --primary: #10b981; /* Emerald Neon */
  --primary-glow: rgba(16, 185, 129, 0.25);
  --accent: #3b82f6; /* Electric Blue */
  --accent-glow: rgba(59, 130, 246, 0.25);
  --amber: #f59e0b; /* Golden Flame */
  --amber-glow: rgba(245, 158, 11, 0.25);
  --danger: #f43f5e; /* Rose */
  --text-main: #f8fafc;
  --text-dim: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-light: rgba(255, 255, 255, 0.14);
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', monospace;
  --shadow-card: 0 10px 30px -5px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 25px rgba(59, 130, 246, 0.15);
  --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- LIGHT THEME (BLANCO Y NEGRO / MODO CLARO) --- */
:root[data-theme="light"],
[data-theme="light"],
body.light-theme,
body.light-theme .dashboard-card,
body.light-theme .resource-card,
body.light-theme .quiz-container,
body.light-theme .evaluation-modal,
[data-theme="light"] .dashboard-card,
[data-theme="light"] .resource-card,
[data-theme="light"] .quiz-container,
[data-theme="light"] .evaluation-modal,
[data-theme="light"] .quiz-modal-content,
[data-theme="light"] .diagnostic-container {
  --text-primary: #0F172A;   /* Texto principal de alto contraste */
  --text-secondary: #334155; /* Texto descriptivo legible */
  --text-muted: #64748B;     /* Etiquetas secundarias */
  --text-main: #0F172A;
  --text-dim: #334155;
  --bg-dark: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --bg-card-alt: #f1f5f9;
  --primary: #059669; /* Crisp Emerald */
  --primary-glow: rgba(5, 150, 105, 0.2);
  --accent: #2563eb; /* Royal Blue */
  --accent-glow: rgba(37, 99, 235, 0.2);
  --amber: #d97706;
  --amber-glow: rgba(217, 119, 6, 0.2);
  --danger: #e11d48;
  --border-color: rgba(0, 0, 0, 0.12);
  --border-light: rgba(0, 0, 0, 0.18);
  --shadow-card: 0 4px 20px -2px rgba(0, 0, 0, 0.08), 0 2px 6px -1px rgba(0, 0, 0, 0.04);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.1);
}

body.light-theme h1,
body.light-theme h2,
body.light-theme h3,
body.light-theme h4,
body.light-theme p,
body.light-theme label,
[data-theme="light"] h1,
[data-theme="light"] h2,
[data-theme="light"] h3,
[data-theme="light"] h4,
[data-theme="light"] p,
[data-theme="light"] label {
  color: var(--text-primary) !important;
}

[data-theme="light"] body,
body.light-theme {
  background-color: #f8fafc;
  color: #0f172a;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.04) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(5, 150, 105, 0.04) 0%, transparent 40%);
}

[data-theme="light"] nav {
  background: #ffffff;
  border-right-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .logo span {
  background: linear-gradient(90deg, #0f172a, #334155);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

[data-theme="light"] .nav-links li {
  color: #475569;
}

[data-theme="light"] .nav-links li:hover {
  background: #f1f5f9;
  color: #0f172a;
}

[data-theme="light"] .nav-links li.active {
  background: rgba(37, 99, 235, 0.1);
  color: #1d4ed8;
  border-left-color: #2563eb;
}

[data-theme="light"] .nav-links li.active i {
  color: #2563eb;
}

[data-theme="light"] .header-left h1,
[data-theme="light"] .plans-header-text h2,
[data-theme="light"] .sidebar-scenario-header h3,
[data-theme="light"] .settings-layout h2,
[data-theme="light"] .card-prompt-text,
[data-theme="light"] .plan-hero-title,
[data-theme="light"] .plan-section-title h3,
[data-theme="light"] .week-title,
[data-theme="light"] .act-header h4,
[data-theme="light"] .agent-title-row h3,
[data-theme="light"] .feedback-title {
  color: #0f172a !important;
}

[data-theme="light"] .header-stat-pill {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.12);
  color: #0f172a;
}

[data-theme="light"] .unified-path-hero {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .day-path-card {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="light"] .plan-tab-btn {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.1);
  color: #0f172a;
}

[data-theme="light"] .plan-hero-card,
[data-theme="light"] .routine-block-card,
[data-theme="light"] .week-card,
[data-theme="light"] .act-card,
[data-theme="light"] .scenario-card,
[data-theme="light"] .agent-display-card,
[data-theme="light"] .settings-layout {
  background: #ffffff !important;
  border-color: rgba(0, 0, 0, 0.1) !important;
}

[data-theme="light"] .teacher-advice-box {
  background: #f8fafc;
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .teacher-quote-content p {
  color: #334155;
}

[data-theme="light"] .pattern-audio-card {
  background: #f8fafc;
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .pattern-english {
  color: #0f172a;
}

[data-theme="light"] .speed-verb-box {
  background: #f8fafc;
  border-color: rgba(0, 0, 0, 0.08);
}

[data-theme="light"] .verb-target {
  color: #0f172a;
}

[data-theme="light"] .verb-opt-btn {
  background: #ffffff;
  border-color: rgba(0, 0, 0, 0.15);
  color: #0f172a;
}

[data-theme="light"] .dialogue-chat-stream {
  background: #f8fafc !important;
  border-color: rgba(0, 0, 0, 0.1) !important;
}

[data-theme="light"] .chat-bubble.agent-bubble {
  background: #ffffff !important;
  border-color: rgba(0, 0, 0, 0.1) !important;
  color: #0f172a !important;
}

[data-theme="light"] .chat-bubble.agent-bubble .bubble-text {
  color: #0f172a !important;
}

[data-theme="light"] .turn-status-banner {
  background: #ffffff !important;
  border-color: rgba(0, 0, 0, 0.12) !important;
}

[data-theme="light"] #turnBannerTitle {
  color: #0f172a !important;
}

/* ==========================================================================
   GLOBAL LIGHT THEME HIGH CONTRAST & LEGIBILITY RULES
   Garantiza slate oscuro (#334155) en textos y casi negro (#0F172A) en títulos
   ========================================================================== */
[data-theme="light"] p,
[data-theme="light"] span:not(.builder-chip):not(.badge-tag):not(.btn-reading-opt span):not(.quiz-option-label span):not(.status-indicator-dot),
[data-theme="light"] label,
[data-theme="light"] small,
[data-theme="light"] li,
[data-theme="light"] .text-muted,
[data-theme="light"] .text-dim,
body.light-theme p,
body.light-theme span:not(.builder-chip):not(.badge-tag),
body.light-theme label,
body.light-theme small,
body.light-theme li,
body.light-theme .text-muted,
body.light-theme .text-dim {
  color: #334155 !important;
}

[data-theme="light"] h1,
[data-theme="light"] h2,
[data-theme="light"] h3,
[data-theme="light"] h4,
[data-theme="light"] h5,
[data-theme="light"] h6,
[data-theme="light"] strong,
[data-theme="light"] b,
body.light-theme h1,
body.light-theme h2,
body.light-theme h3,
body.light-theme h4,
body.light-theme h5,
body.light-theme h6,
body.light-theme strong,
body.light-theme b {
  color: #0f172a !important;
}

[data-theme="light"] .rule-statement-box,
[data-theme="light"] .guide-examples-container,
[data-theme="light"] .guide-example-item,
[data-theme="light"] .social-immersion-card,
[data-theme="light"] .social-media-item,
[data-theme="light"] .sentence-builder-card,
[data-theme="light"] .guide-vocab-card,
[data-theme="light"] .reading-passage-box,
[data-theme="light"] .reading-q-card,
[data-theme="light"] .quick-quiz-card,
[data-theme="light"] .plan-hero-card,
[data-theme="light"] .routine-block-card,
[data-theme="light"] .week-card,
[data-theme="light"] .act-card,
[data-theme="light"] .settings-layout,
[data-theme="light"] .daily-session-plan-box,
body.light-theme .rule-statement-box,
body.light-theme .guide-examples-container,
body.light-theme .guide-example-item,
body.light-theme .social-immersion-card,
body.light-theme .social-media-item,
body.light-theme .sentence-builder-card,
body.light-theme .guide-vocab-card,
body.light-theme .reading-passage-box,
body.light-theme .reading-q-card,
body.light-theme .quick-quiz-card,
body.light-theme .plan-hero-card,
body.light-theme .routine-block-card,
body.light-theme .week-card,
body.light-theme .act-card,
body.light-theme .settings-layout,
body.light-theme .daily-session-plan-box {
  background: #ffffff !important;
  border-color: #e2e8f0 !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05) !important;
}

[data-theme="light"] .builder-hint-card,
body.light-theme .builder-hint-card {
  background: #eff6ff !important;
  border: 1px solid #93c5fd !important;
  color: #1e3a8a !important;
}

[data-theme="light"] .builder-hint-card strong,
body.light-theme .builder-hint-card strong {
  color: #1e40af !important;
}

[data-theme="light"] .builder-hint-card p,
body.light-theme .builder-hint-card p {
  color: #1e3a8a !important;
}

/* --- BASE STYLES & RESET --- */
html {
  font-size: 15px;
}

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

html, body, button, input, select, textarea {
  font-family: var(--font-sans);
}

/* Guard Font Awesome Icons against any font-family overrides */
i, .fa, .fas, .far, .fab, .fa-solid, .fa-regular, .fa-brands, [class*="fa-"] {
  font-family: "Font Awesome 6 Free", "Font Awesome 6 Brands", "FontAwesome" !important;
  font-style: normal;
  display: inline-block;
}

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  display: flex;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(59, 130, 246, 0.06) 0%, transparent 40%),
    radial-gradient(circle at 90% 80%, rgba(16, 185, 129, 0.05) 0%, transparent 40%);
}

/* --- SIDEBAR NAVIGATION --- */
nav {
  width: 250px;
  background: var(--bg-card);
  padding: 2rem 1.2rem;
  display: flex;
  flex-direction: column;
  border-right: 1px solid var(--border-color);
  position: fixed;
  height: 100vh;
  z-index: 50;
  backdrop-filter: blur(16px);
}

.logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #ffffff;
  margin-bottom: 2.4rem;
  display: flex;
  align-items: center;
  gap: 12px;
}

.logo-bolt {
  width: 38px;
  height: 38px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 1.1rem;
  box-shadow: 0 0 15px var(--primary-glow);
}

.logo span {
  background: linear-gradient(90deg, #ffffff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.nav-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav-links li {
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition-fast);
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 14px;
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.nav-links li i {
  font-size: 1.15rem;
  width: 22px;
  text-align: center;
  transition: var(--transition-fast);
}

.nav-links li:hover {
  background: var(--bg-card-hover);
  color: #ffffff;
  transform: translateX(4px);
}

.nav-links li.active {
  background: linear-gradient(90deg, rgba(59, 130, 246, 0.18), rgba(59, 130, 246, 0.04));
  color: #ffffff;
  font-weight: 600;
  border-left: 3px solid var(--accent);
}

.nav-links li.active i {
  color: var(--accent);
}

.nav-footer-badge {
  margin-top: auto;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 14px;
  border-radius: var(--radius-md);
  text-align: center;
}

.nav-footer-badge span {
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 1px;
}

.nav-footer-badge p {
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: 4px;
}

/* --- MAIN CONTENT & HEADER --- */
main {
  margin-left: 250px;
  flex: 1;
  padding: 1.6rem 2.4rem;
  min-height: 100vh;
  position: relative;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.8rem;
  padding-bottom: 1.2rem;
  border-bottom: 1px solid var(--border-color);
}

.header-left h1 {
  font-size: 1.65rem;
  font-weight: 800;
  letter-spacing: -0.5px;
}

.header-left p {
  color: var(--text-dim);
  font-size: 0.88rem;
  margin-top: 4px;
}

.btn-theme-toggle {
  background: var(--bg-card) !important;
  color: var(--text-main) !important;
  border: 1px solid var(--border-color) !important;
  border-radius: var(--radius-sm) !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition-fast);
}

.btn-theme-toggle:hover {
  border-color: var(--primary) !important;
  color: var(--primary) !important;
  transform: translateY(-1px);
}

.stats-bar {
  display: flex;
  gap: 14px;
  align-items: center;
}

.stat-card {
  background: var(--bg-card);
  padding: 10px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-card);
  transition: var(--transition-fast);
}

.stat-card:hover {
  border-color: var(--border-light);
  transform: translateY(-2px);
}

.streak-card .fa-fire {
  color: var(--amber);
  font-size: 1.25rem;
  animation: flameFlicker 2s infinite alternate ease-in-out;
}

@keyframes flameFlicker {
  0% { transform: scale(1); filter: drop-shadow(0 0 4px rgba(245, 158, 11, 0.4)); }
  100% { transform: scale(1.15) rotate(3deg); filter: drop-shadow(0 0 10px rgba(245, 158, 11, 0.8)); }
}

.streak-val {
  color: var(--amber);
  font-weight: 700;
  font-size: 0.95rem;
}

.level-card .fa-star {
  color: var(--accent);
  font-size: 1.2rem;
}

.level-val {
  font-weight: 600;
  font-size: 0.92rem;
  color: #ffffff;
}

.btn-diag-header {
  background: rgba(59, 130, 246, 0.12);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: #60a5fa;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-fast);
}

.btn-diag-header:hover {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 16px var(--accent-glow);
}

/* --- APP VIEWS SWITCHING --- */
.app-view-section {
  display: none !important;
  animation: fadeInView 0.3s ease-in-out;
}

.app-view-section.active-view {
  display: block !important;
}

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

/* --- DYNAMIC DAILY SESSION PLAN CARD (PACING LOGIC) --- */
.daily-session-plan-box {
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.85), rgba(15, 23, 42, 0.95));
  border: 1px solid rgba(59, 130, 246, 0.3);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 2.2rem;
  box-shadow: var(--shadow-card);
}

.session-plan-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 18px;
}

.plan-mode-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(16, 185, 129, 0.15);
  color: var(--primary);
  border: 1px solid rgba(16, 185, 129, 0.3);
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 800;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}

.session-plan-title-block h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: #ffffff;
  margin-bottom: 4px;
}

.session-plan-title-block p {
  font-size: 0.88rem;
  color: var(--text-dim);
}

.session-progress-gauge {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  padding: 12px 18px;
  border-radius: var(--radius-md);
  text-align: right;
  min-width: 200px;
}

.gauge-text {
  font-size: 1rem;
  font-weight: 800;
  color: #ffffff;
}

.gauge-bar {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-full);
  margin: 6px 0 4px;
  overflow: hidden;
}

.gauge-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--primary));
  transition: width 0.3s ease;
}

.session-progress-gauge small {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.session-tasks-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.session-task-row {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  min-height: 64px;
  transition: var(--transition-fast);
}

.session-task-row:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-light);
  transform: translateX(4px);
}

.session-task-row.task-done {
  border-color: rgba(16, 185, 129, 0.4);
  background: rgba(16, 185, 129, 0.05);
}

.session-task-row.task-done .task-num {
  background: rgba(16, 185, 129, 0.2);
  color: #10b981;
}

.task-info {
  display: flex;
  align-items: center;
  gap: 14px;
  flex: 1;
  min-width: 0;
}

.task-num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: #ffffff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 800;
  flex-shrink: 0;
}

.task-icon {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.task-text-wrap {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.task-title {
  display: block;
  font-size: 0.95rem;
  font-weight: 700;
  color: #ffffff;
  white-space: normal;
  word-break: break-word;
}

.task-duration {
  font-size: 0.8rem;
  color: var(--text-dim);
  display: flex;
  align-items: center;
  gap: 6px;
}

.btn-task-action {
  background: rgba(59, 130, 246, 0.15);
  border: 1px solid rgba(59, 130, 246, 0.35);
  color: #93c5fd;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.84rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition-fast);
}

.btn-task-action:hover {
  background: var(--accent);
  color: #ffffff;
  box-shadow: 0 0 12px var(--accent-glow);
}

.btn-task-action.btn-task-done {
  background: rgba(16, 185, 129, 0.2);
  border-color: #10b981;
  color: #34d399;
}

/* --- COMMON BUTTONS & BADGES --- */
.btn-primary-large {
  background: linear-gradient(135deg, var(--primary), #059669);
  color: #042f2e;
  border: none;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: var(--transition-fast);
  box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary-large:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(16, 185, 129, 0.4);
  color: #022c22;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-light);
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition-fast);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
}

.badge-level {
  background: rgba(59, 130, 246, 0.15);
  color: #93c5fd;
  border: 1px solid rgba(59, 130, 246, 0.3);
  padding: 3px 8px;
  border-radius: var(--radius-full);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* --- MODAL OVERLAY BASE --- */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(4, 8, 18, 0.85);
  backdrop-filter: blur(8px);
  display: none;
  justify-content: center;
  align-items: center;
  z-index: 200;
  padding: 20px;
}

.modal-overlay.active {
  display: flex;
}

.modal-header-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 15px;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
}

.modal-close-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  font-size: 1.8rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: var(--transition-fast);
}

.modal-close-btn:hover {
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
}

/* --- FLOATING AI LAB CARD --- */
.ai-lab-card {
  position: fixed;
  bottom: 28px;
  right: 32px;
  width: 320px;
  background: rgba(18, 26, 44, 0.95);
  backdrop-filter: blur(12px);
  border-radius: var(--radius-lg);
  padding: 22px;
  border: 1px solid rgba(16, 185, 129, 0.4);
  box-shadow: 0 12px 35px rgba(0, 0, 0, 0.5), 0 0 25px rgba(16, 185, 129, 0.15);
  z-index: 40;
  transition: var(--transition-fast);
}

.hidden, [hidden] {
  display: none !important;
}

.ai-lab-card.hidden,
.speaking-mentor-widget.hidden {
  display: none !important;
  visibility: hidden !important;
  opacity: 0 !important;
  pointer-events: none !important;
}

.ai-card-close {
  position: absolute;
  top: 12px;
  right: 14px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: var(--text-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 1.2rem;
  line-height: 1;
  transition: var(--transition-fast);
  z-index: 2;
}

.ai-card-close:hover {
  background: rgba(239, 68, 68, 0.25);
  border-color: #ef4444;
  color: #ffffff;
}

.ai-lab-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
}

.ai-status {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.pulse {
  width: 10px;
  height: 10px;
  background: var(--primary);
  border-radius: 50%;
  animation: pulse-animation 2s infinite;
}

@keyframes pulse-animation {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.7); }
  70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(16, 185, 129, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

.ai-lab-card p {
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 16px;
  line-height: 1.4;
}

.btn-speak {
  width: 100%;
  background: linear-gradient(135deg, var(--primary), #059669);
  border: none;
  padding: 12px;
  border-radius: var(--radius-sm);
  color: #022c22;
  font-weight: 700;
  font-size: 0.9rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  transition: var(--transition-fast);
}

.btn-speak:hover {
  box-shadow: 0 0 20px var(--primary-glow);
}

/* --- TOAST NOTIFICATIONS --- */
.toast-container {
  position: fixed;
  bottom: 25px;
  left: 300px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 300;
  pointer-events: none;
}

.toast-item {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  color: #ffffff;
  padding: 12px 18px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  gap: 12px;
  box-shadow: var(--shadow-card);
  font-size: 0.9rem;
  font-weight: 500;
  animation: slideInToast 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: auto;
  max-width: 400px;
}

.toast-item.hide {
  opacity: 0;
  transform: translateY(10px);
  transition: 0.3s;
}

.toast-success i { color: var(--primary); }
.toast-info i { color: var(--accent); }
.toast-warning i { color: var(--amber); }
.toast-error i { color: var(--danger); }

@keyframes slideInToast {
  from { opacity: 0; transform: translateY(15px); }
  to { opacity: 1; transform: translateY(0); }
}

/* --- RESPONSIVE BASICS --- */
/* --- RESPONSIVE ARCHITECTURE --- */
@media (max-width: 1024px) {
  nav { width: 80px; padding: 2rem 0.5rem; align-items: center; }
  .logo span, .nav-links li span, .nav-footer-badge { display: none; }
  .nav-links li { justify-content: center; padding: 14px; }
  main { margin-left: 80px; padding: 1.5rem; }
  .toast-container { left: 100px; }
}

@media (max-width: 768px) {
  /* 1. Fluid Full-Width Container & Zero Horizontal Scroll */
  html, body {
    width: 100% !important;
    max-width: 100% !important;
    overflow-x: hidden !important;
  }

  body {
    flex-direction: column !important;
    padding-bottom: 74px !important; /* Espacio para el Bottom Navigation Bar */
  }

  /* 2. Mobile Bottom Navigation Bar */
  nav {
    position: fixed !important;
    top: auto !important;
    bottom: 0 !important;
    left: 0 !important;
    right: 0 !important;
    width: 100% !important;
    height: 64px !important;
    flex-direction: row !important;
    justify-content: space-around !important;
    align-items: center !important;
    padding: 0 !important;
    background: rgba(15, 23, 42, 0.98) !important;
    backdrop-filter: blur(20px) !important;
    border-top: 1px solid var(--border-color) !important;
    border-right: none !important;
    z-index: 1000 !important;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5) !important;
  }

  .logo, .nav-footer-badge {
    display: none !important;
  }

  .nav-links {
    flex-direction: row !important;
    width: 100% !important;
    justify-content: space-around !important;
    align-items: center !important;
    gap: 0 !important;
    padding: 0 4px !important;
  }

  .nav-links li {
    flex-direction: column !important;
    justify-content: center !important;
    align-items: center !important;
    gap: 3px !important;
    padding: 8px 10px !important;
    border-radius: 8px !important;
    border-left: none !important;
    min-width: 48px !important;
    min-height: 48px !important;
    flex: 1 !important;
  }

  .nav-links li span {
    display: block !important;
    font-size: 0.68rem !important;
    font-weight: 600 !important;
    line-height: 1 !important;
  }

  .nav-links li i {
    font-size: 1.25rem !important;
    width: auto !important;
  }

  .nav-links li.active {
    background: rgba(59, 130, 246, 0.15) !important;
    border-top: 2px solid var(--accent) !important;
    border-left: none !important;
    color: var(--accent) !important;
  }

  /* 3. Fluid Main Container */
  main {
    margin-left: 0 !important;
    width: 100% !important;
    max-width: 100% !important;
    box-sizing: border-box !important;
    padding: 1rem 1rem 80px 1rem !important;
    overflow-x: hidden !important;
  }

  header {
    flex-direction: column !important;
    align-items: flex-start !important;
    gap: 12px !important;
    padding-bottom: 1rem !important;
  }

  .header-left h1 {
    font-size: 1.35rem !important;
  }

  /* 4. Single-Column Grids on Mobile */
  .grid-2, .grid-3, .grid-4,
  .dashboard-grid,
  .plans-grid,
  .stats-bar,
  .social-media-grid,
  .guide-vocab-grid {
    grid-template-columns: 1fr !important;
    gap: 12px !important;
    width: 100% !important;
  }

  /* 5. Touch Targets & Floating Widget */
  #floatingSpeakingCard {
    right: 14px !important;
    left: 14px !important;
    bottom: 74px !important;
    width: auto !important;
  }

  .toast-container {
    left: 14px !important;
    right: 14px !important;
    bottom: 78px !important;
  }
}