:root {
  --primary: #6C63FF;
  --primary-light: #8B85FF;
  --primary-dark: #4C44D4;
  --secondary: #FF6B6B;
  --accent: #43D9AD;
  --warning: #FFB347;
  --bg: #F0F2FF;
  --surface: #FFFFFF;
  --surface2: #F7F8FF;
  --border: #E2E5F5;
  --text: #1A1B3A;
  --text-muted: #6B7280;
  --text-light: #9CA3AF;
  --shadow-sm: 0 2px 8px rgba(108,99,255,0.08);
  --shadow: 0 4px 20px rgba(108,99,255,0.12);
  --shadow-lg: 0 8px 40px rgba(108,99,255,0.18);
  --radius: 16px;
  --radius-sm: 10px;
  --radius-lg: 24px;
  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: var(--font); background: var(--bg); color: var(--text); min-height: 100vh; overflow-x: hidden; }

/* LOADING */
#loading-screen { position: fixed; inset: 0; background: linear-gradient(135deg, #6C63FF 0%, #8B85FF 50%, #43D9AD 100%); display: flex; flex-direction: column; align-items: center; justify-content: center; z-index: 9999; transition: opacity 0.5s ease; }
#loading-screen.fade-out { opacity: 0; pointer-events: none; }
.loader-logo { font-size: 64px; animation: bounce 1s infinite; }
.loader-text { color: white; font-size: 28px; font-weight: 900; letter-spacing: -1px; margin: 8px 0 20px; }
.loader-dots { display: flex; gap: 8px; }
.loader-dots span { width: 10px; height: 10px; border-radius: 50%; background: rgba(255,255,255,0.7); animation: pulse-dot 1.2s infinite; }
.loader-dots span:nth-child(2) { animation-delay: 0.2s; }
.loader-dots span:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-12px); } }
@keyframes pulse-dot { 0%,100% { transform: scale(1); opacity: 0.7; } 50% { transform: scale(1.3); opacity: 1; } }

/* LAYOUT */
#app { min-height: 100vh; }
.app-layout { display: grid; grid-template-columns: 260px 1fr; min-height: 100vh; transition: grid-template-columns 0.25s ease; }
.app-layout.sidebar-hidden { grid-template-columns: 48px 1fr; }

/* SIDEBAR */
.sidebar { background: white; border-right: 1px solid var(--border); display: flex; flex-direction: column; position: sticky; top: 0; height: 100vh; overflow-y: auto; box-shadow: 4px 0 20px rgba(108,99,255,0.05); overflow-x: hidden; transition: width 0.25s ease; width: 260px; }
.app-layout.sidebar-hidden .sidebar { width: 48px; }
.app-layout.sidebar-hidden .sidebar > *:not(.sidebar-toggle) { opacity: 0; pointer-events: none; transition: opacity 0.15s ease; }
.app-layout:not(.sidebar-hidden) .sidebar > *:not(.sidebar-toggle) { opacity: 1; pointer-events: auto; transition: opacity 0.2s ease 0.1s; }

/* Botón toggle del sidebar */
.sidebar-toggle { position: absolute; top: 12px; right: 8px; width: 28px; height: 28px; border-radius: 50%; border: 1px solid var(--border); background: var(--surface2); color: var(--text-muted); font-size: 16px; font-weight: 900; cursor: pointer; display: flex; align-items: center; justify-content: center; z-index: 10; transition: all 0.25s ease; line-height: 1; padding: 0; }
.sidebar-toggle:hover { background: var(--primary); color: white; border-color: var(--primary); }
.app-layout.sidebar-hidden .sidebar-toggle { right: 50%; transform: translateX(50%) rotate(180deg); top: 12px; }
.sidebar-logo { padding: 24px 20px 16px; display: flex; align-items: center; gap: 10px; text-decoration: none; border-bottom: 1px solid var(--border); cursor: pointer; }
.sidebar-logo .logo-icon { font-size: 28px; }
.sidebar-logo .logo-text { font-size: 20px; font-weight: 900; background: linear-gradient(135deg, var(--primary), var(--accent)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.sidebar-user { padding: 16px 20px; display: flex; align-items: center; gap: 12px; border-bottom: 1px solid var(--border); }
.user-avatar { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 800; color: white; flex-shrink: 0; }
.user-info .user-name { font-weight: 700; font-size: 14px; }
.user-info .user-xp { font-size: 12px; color: var(--text-muted); font-weight: 600; }
.sidebar-xp-bar { padding: 8px 20px 16px; border-bottom: 1px solid var(--border); }
.xp-label { font-size: 11px; font-weight: 700; color: var(--text-muted); margin-bottom: 6px; display: flex; justify-content: space-between; }
.xp-bar-bg { height: 8px; background: var(--border); border-radius: 4px; overflow: hidden; }
.xp-bar-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 4px; transition: width 0.5s ease; }
.sidebar-nav { padding: 12px; flex: 1; }
.nav-section-title { font-size: 10px; font-weight: 800; letter-spacing: 1px; color: var(--text-light); text-transform: uppercase; padding: 8px 8px 4px; }
.nav-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: var(--radius-sm); text-decoration: none; color: var(--text-muted); font-weight: 700; font-size: 14px; cursor: pointer; transition: var(--transition); border: none; background: none; width: 100%; text-align: left; }
.nav-item:hover { background: var(--surface2); color: var(--primary); }
.nav-item.active { background: linear-gradient(135deg, #EEF0FF, #F0FBF8); color: var(--primary); }
.nav-item .nav-icon { font-size: 18px; width: 24px; text-align: center; }
.sidebar-streak { margin: 0 12px 12px; background: linear-gradient(135deg, #FF6B6B15, #FFB34715); border: 1px solid #FF6B6B30; border-radius: var(--radius-sm); padding: 12px; text-align: center; }
.streak-fire { font-size: 28px; }
.streak-count { font-size: 22px; font-weight: 900; color: var(--secondary); }
.streak-label { font-size: 11px; color: var(--text-muted); font-weight: 700; }
.sidebar-logout { padding: 12px; border-top: 1px solid var(--border); }
.btn-logout { width: 100%; padding: 10px; border: none; background: none; color: var(--text-muted); font-family: var(--font); font-weight: 700; font-size: 14px; border-radius: var(--radius-sm); cursor: pointer; transition: var(--transition); display: flex; align-items: center; justify-content: center; gap: 8px; }
.btn-logout:hover { background: #FFF0F0; color: var(--secondary); }

/* MAIN */
.main-content { overflow-y: auto; }
.page-header { padding: 32px 40px 0; display: flex; align-items: flex-start; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.page-title { font-size: 32px; font-weight: 900; letter-spacing: -1px; }
.page-subtitle { color: var(--text-muted); font-size: 15px; font-weight: 600; margin-top: 4px; }
.page-body { padding: 24px 40px 40px; }

/* CARDS */
.card { background: white; border-radius: var(--radius); border: 1px solid var(--border); box-shadow: var(--shadow-sm); overflow: hidden; }
.card-header { padding: 20px 24px 0; }
.card-body { padding: 20px 24px; }
.card-title { font-size: 16px; font-weight: 800; }

/* BUTTONS */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border-radius: var(--radius-sm); border: none; font-family: var(--font); font-size: 15px; font-weight: 800; cursor: pointer; transition: var(--transition); text-decoration: none; }
.btn-primary { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: white; box-shadow: 0 4px 15px rgba(108,99,255,0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(108,99,255,0.4); }
.btn-secondary { background: var(--surface2); color: var(--text); border: 1px solid var(--border); }
.btn-secondary:hover { background: var(--border); }
.btn-accent { background: linear-gradient(135deg, var(--accent), #2BC89A); color: white; box-shadow: 0 4px 15px rgba(67,217,173,0.3); }
.btn-accent:hover { transform: translateY(-2px); }
.btn-danger { background: linear-gradient(135deg, var(--secondary), #FF4F4F); color: white; }
.btn-sm { padding: 8px 16px; font-size: 13px; }
.btn-lg { padding: 16px 32px; font-size: 17px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none !important; }
.w-full { width: 100%; }

/* FORMS */
.form-group { margin-bottom: 20px; }
.form-label { display: block; font-weight: 700; font-size: 14px; margin-bottom: 6px; }
.form-control { width: 100%; padding: 12px 16px; border: 2px solid var(--border); border-radius: var(--radius-sm); font-family: var(--font); font-size: 15px; color: var(--text); background: white; transition: var(--transition); outline: none; }
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(108,99,255,0.1); }
textarea.form-control { resize: vertical; min-height: 80px; }

/* STATS */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; }
.stat-card { background: white; border-radius: var(--radius); padding: 20px; border: 1px solid var(--border); display: flex; flex-direction: column; gap: 4px; position: relative; overflow: hidden; }
.stat-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; background: var(--stat-color, var(--primary)); }
.stat-icon { font-size: 28px; margin-bottom: 4px; }
.stat-value { font-size: 32px; font-weight: 900; }
.stat-label { font-size: 13px; font-weight: 700; color: var(--text-muted); }

/* TOPICS */
.topics-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 20px; }
.topic-card { background: white; border-radius: var(--radius-lg); border: 2px solid var(--border); cursor: pointer; transition: var(--transition); overflow: hidden; }
.topic-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--topic-color, var(--primary)); }
.topic-card-header { padding: 24px; background: linear-gradient(135deg, var(--topic-color, var(--primary))15, var(--topic-color, var(--primary))08); display: flex; align-items: center; gap: 16px; }
.topic-icon-big { font-size: 44px; }
.topic-card-title { font-size: 20px; font-weight: 900; }
.topic-card-desc { font-size: 13px; color: var(--text-muted); font-weight: 600; margin-top: 2px; }
.topic-card-footer { padding: 16px 24px; border-top: 1px solid var(--border); }
.topic-progress-bar { height: 6px; background: var(--border); border-radius: 3px; overflow: hidden; margin-top: 8px; }
.topic-progress-fill { height: 100%; border-radius: 3px; background: var(--topic-color, var(--primary)); transition: width 0.5s; }
.topic-lessons-count { font-size: 13px; font-weight: 700; color: var(--text-muted); }
.topic-progress-pct { font-size: 13px; font-weight: 800; color: var(--topic-color, var(--primary)); }

/* LESSONS */
.lesson-list { display: flex; flex-direction: column; gap: 12px; }
.lesson-item { background: white; border-radius: var(--radius); border: 2px solid var(--border); padding: 18px 20px; display: flex; align-items: center; gap: 16px; cursor: pointer; transition: var(--transition); }
.lesson-item:hover { border-color: var(--primary); box-shadow: var(--shadow); }
.lesson-item.locked { opacity: 0.5; cursor: not-allowed; }
.lesson-status-icon { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; background: var(--surface2); }
.lesson-status-icon.completed { background: #43D9AD20; }
.lesson-info { flex: 1; }
.lesson-title { font-size: 15px; font-weight: 800; }
.lesson-meta { display: flex; gap: 12px; margin-top: 4px; }
.lesson-badge { display: flex; align-items: center; gap: 4px; font-size: 12px; font-weight: 700; color: var(--text-muted); }
.difficulty-dots { display: flex; gap: 3px; }
.difficulty-dot { width: 8px; height: 8px; border-radius: 50%; background: var(--border); }
.difficulty-dot.active { background: var(--warning); }
.lesson-xp-badge { margin-left: auto; background: linear-gradient(135deg, #6C63FF15, #6C63FF08); color: var(--primary); font-size: 12px; font-weight: 800; padding: 4px 10px; border-radius: 20px; border: 1px solid #6C63FF20; }

/* AUTH */
.auth-page { min-height: 100vh; display: grid; grid-template-columns: 1fr 1fr; }
.auth-left { background: linear-gradient(145deg, #6C63FF, #43D9AD); display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 60px; position: relative; overflow: hidden; }
.auth-left::before { content: ''; position: absolute; width: 400px; height: 400px; border-radius: 50%; background: rgba(255,255,255,0.08); top: -100px; right: -100px; }
.auth-left::after { content: ''; position: absolute; width: 300px; height: 300px; border-radius: 50%; background: rgba(255,255,255,0.05); bottom: -80px; left: -80px; }
.auth-left-content { position: relative; z-index: 1; text-align: center; }
.auth-logo-big { font-size: 80px; margin-bottom: 16px; animation: float 3s ease-in-out infinite; }
.auth-tagline { color: white; font-size: 36px; font-weight: 900; letter-spacing: -1px; line-height: 1.1; }
.auth-sub { color: rgba(255,255,255,0.85); font-size: 16px; font-weight: 600; margin-top: 12px; line-height: 1.5; }
.auth-features { display: flex; flex-direction: column; gap: 12px; margin-top: 32px; }
.auth-feature { display: flex; align-items: center; gap: 12px; color: white; font-weight: 700; background: rgba(255,255,255,0.15); padding: 12px 20px; border-radius: var(--radius); backdrop-filter: blur(10px); }
.auth-right { display: flex; align-items: center; justify-content: center; padding: 40px; background: var(--bg); }
.auth-box { background: white; border-radius: var(--radius-lg); padding: 40px; width: 100%; max-width: 420px; box-shadow: var(--shadow-lg); }
.auth-tabs { display: flex; gap: 4px; background: var(--surface2); border-radius: var(--radius-sm); padding: 4px; margin-bottom: 28px; }
.auth-tab { flex: 1; padding: 8px; text-align: center; border-radius: 8px; font-weight: 800; font-size: 14px; cursor: pointer; transition: var(--transition); color: var(--text-muted); }
.auth-tab.active { background: white; color: var(--primary); box-shadow: var(--shadow-sm); }
.auth-footer { text-align: center; margin-top: 20px; font-size: 13px; color: var(--text-muted); }
@keyframes float { 0%,100% { transform: translateY(0) rotate(-5deg); } 50% { transform: translateY(-15px) rotate(5deg); } }

/* LESSON PLAYER */
.lesson-player { max-width: 760px; margin: 0 auto; padding: 32px 40px; }
.lesson-progress-track { background: var(--border); border-radius: 4px; height: 8px; overflow: hidden; margin-top: 16px; }
.lesson-progress-fill { height: 100%; background: linear-gradient(90deg, var(--primary), var(--accent)); border-radius: 4px; transition: width 0.4s ease; }
.lesson-block { display: none; animation: fadeSlide 0.4s ease; }
.lesson-block.active { display: block; }
@keyframes fadeSlide { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

.content-block { background: white; border-radius: var(--radius-lg); border: 1px solid var(--border); overflow: hidden; }
.content-block-header { padding: 20px 24px 16px; background: linear-gradient(135deg, #6C63FF10, #43D9AD08); border-bottom: 1px solid var(--border); display: flex; gap: 10px; align-items: center; }
.content-block-badge { background: var(--primary); color: white; font-size: 11px; font-weight: 800; padding: 4px 10px; border-radius: 20px; }
.content-block-body { padding: 24px; font-size: 16px; line-height: 1.7; font-weight: 600; }
.code-block { background: #1A1B3A; border-radius: var(--radius-sm); padding: 20px; margin-top: 16px; overflow-x: auto; }
.code-block code { font-family: var(--font-mono); color: #A8D1FF; font-size: 14px; line-height: 1.6; white-space: pre; }

.question-block { background: white; border-radius: var(--radius-lg); border: 2px solid var(--border); overflow: hidden; }
.question-block-header { padding: 20px 24px 16px; background: linear-gradient(135deg, #FF6B6B10, #FFB34708); border-bottom: 1px solid var(--border); display: flex; gap: 10px; align-items: center; }
.question-badge { background: var(--secondary); color: white; font-size: 11px; font-weight: 800; padding: 4px 10px; border-radius: 20px; }
.question-text { padding: 24px 24px 16px; font-size: 17px; font-weight: 800; line-height: 1.5; }
.options-list { padding: 0 24px 24px; display: flex; flex-direction: column; gap: 10px; }
.option-btn { width: 100%; padding: 14px 18px; border-radius: var(--radius-sm); border: 2px solid var(--border); background: var(--surface2); font-family: var(--font); font-size: 15px; font-weight: 700; text-align: left; cursor: pointer; transition: var(--transition); display: flex; align-items: center; gap: 12px; }
.option-btn:hover:not(:disabled) { border-color: var(--primary); background: #6C63FF08; }
.option-btn.correct { border-color: var(--accent) !important; background: #43D9AD15 !important; }
.option-btn.wrong { border-color: var(--secondary) !important; background: #FF6B6B10 !important; }
.option-btn:disabled { cursor: default; }
.option-btn.selected { border-color: var(--primary) !important; background: #6C63FF15 !important; }
.option-letter { width: 28px; height: 28px; border-radius: 50%; border: 2px solid currentColor; display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 900; flex-shrink: 0; }
.ordering-item { display: flex; align-items: center; gap: 12px; padding: 12px 14px; border-radius: var(--radius-sm); border: 2px solid var(--border); background: var(--surface2); font-weight: 700; font-size: 15px; margin-bottom: 8px; transition: var(--transition); }
.ordering-handle { min-width: 28px; height: 28px; border-radius: 50%; background: var(--primary); color: white; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 900; }
.btn-icon { background: var(--surface); border: 1px solid var(--border); border-radius: 4px; width: 24px; height: 24px; cursor: pointer; font-size: 11px; display: flex; align-items: center; justify-content: center; color: var(--text); transition: var(--transition); }
.btn-icon:hover:not(:disabled) { background: var(--primary); color: white; border-color: var(--primary); }
.btn-icon:disabled { opacity: 0.3; cursor: default; }
.matching-grid { display: flex; flex-direction: column; gap: 10px; }
.matching-row { display: flex; align-items: center; gap: 12px; }
.matching-left { min-width: 140px; padding: 10px 14px; border-radius: var(--radius-sm); border: 2px solid var(--border); background: var(--surface2); font-weight: 700; font-size: 14px; }
.matching-arrow { color: var(--text-muted); font-size: 18px; font-weight: 900; }
.matching-select { flex: 1; padding: 10px 12px; border-radius: var(--radius-sm); border: 2px solid var(--border); background: var(--surface2); font-family: var(--font); font-size: 14px; font-weight: 700; color: var(--text); cursor: pointer; transition: var(--transition); }
.matching-select:focus { outline: none; border-color: var(--primary); }
.matching-select.correct { border-color: var(--accent) !important; background: #43D9AD15 !important; }
.matching-select.wrong { border-color: var(--secondary) !important; background: #FF6B6B10 !important; }
.fill-blank-input { margin: 0 24px 24px; }
.answer-feedback { margin: 0 24px 24px; padding: 14px 18px; border-radius: var(--radius-sm); font-weight: 700; font-size: 14px; display: flex; gap: 10px; align-items: flex-start; }
.answer-feedback.correct { background: #43D9AD15; border: 1px solid #43D9AD40; color: #1A9B7A; }
.answer-feedback.wrong { background: #FF6B6B10; border: 1px solid #FF6B6B30; color: #CC3333; }
.lesson-nav { display: flex; justify-content: space-between; align-items: center; margin-top: 24px; }

/* RESULT */
.result-screen { text-align: center; padding: 40px; }
.result-emoji { font-size: 80px; animation: bounce 1s infinite; }
.result-score { font-size: 64px; font-weight: 900; }
.result-label { font-size: 20px; font-weight: 700; color: var(--text-muted); }
.result-xp { display: inline-flex; align-items: center; gap: 8px; background: linear-gradient(135deg, #6C63FF20, #43D9AD15); border: 1px solid #6C63FF30; border-radius: 30px; padding: 10px 20px; font-size: 18px; font-weight: 900; color: var(--primary); margin: 20px 0; }

/* ACHIEVEMENTS */
.achievements-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 16px; }
.achievement-card { background: white; border-radius: var(--radius); border: 2px solid var(--border); padding: 20px; text-align: center; transition: var(--transition); }
.achievement-card.earned { border-color: #43D9AD40; background: linear-gradient(135deg, #43D9AD08, #6C63FF05); }
.achievement-card.locked { opacity: 0.5; filter: grayscale(1); }
.achievement-icon { font-size: 36px; margin-bottom: 8px; }
.achievement-title { font-size: 14px; font-weight: 800; }
.achievement-desc { font-size: 12px; color: var(--text-muted); font-weight: 600; margin-top: 4px; }
.achievement-xp { font-size: 12px; font-weight: 800; color: var(--primary); margin-top: 8px; }

/* ACHIEVEMENT POPUP */
#achievement-popup { position: fixed; bottom: 24px; right: 24px; background: white; border-radius: var(--radius-lg); border: 2px solid #43D9AD; padding: 20px; box-shadow: 0 8px 40px rgba(67,217,173,0.3); z-index: 9999; max-width: 300px; animation: slideIn 0.4s cubic-bezier(0.34,1.56,0.64,1); }
#achievement-popup.hidden { display: none; }
.achievement-popup-badge { background: linear-gradient(135deg, var(--accent), #2BC89A); color: white; font-size: 10px; font-weight: 800; padding: 3px 8px; border-radius: 20px; }
@keyframes slideIn { from { transform: translateX(120%); } to { transform: translateX(0); } }

/* TOAST */
#toast-container { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); z-index: 9998; display: flex; flex-direction: column; gap: 8px; }
.toast { background: var(--text); color: white; padding: 12px 20px; border-radius: var(--radius-sm); font-weight: 700; font-size: 14px; box-shadow: var(--shadow-lg); animation: slideUp 0.3s ease; white-space: nowrap; }
.toast.success { background: #1A9B7A; }
.toast.error { background: var(--secondary); }
@keyframes slideUp { from { transform: translateY(20px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

/* MODAL */
#modal-overlay { position: fixed; inset: 0; background: rgba(26,27,58,0.6); backdrop-filter: blur(4px); z-index: 1000; display: flex; align-items: center; justify-content: center; padding: 20px; }
#modal-overlay.hidden { display: none; }
.modal { background: white; border-radius: var(--radius-lg); max-width: 600px; width: 100%; max-height: 90vh; overflow-y: auto; box-shadow: var(--shadow-lg); }
.modal-header { padding: 24px 24px 0; display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 20px; font-weight: 900; }
.modal-close { background: none; border: none; font-size: 24px; cursor: pointer; color: var(--text-muted); line-height: 1; }
.modal-body { padding: 20px 24px; }
.modal-footer { padding: 0 24px 24px; display: flex; gap: 12px; justify-content: flex-end; }

/* ADMIN TABLE */
.admin-table { width: 100%; border-collapse: collapse; }
.admin-table th { text-align: left; padding: 10px 16px; font-size: 12px; font-weight: 800; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; border-bottom: 2px solid var(--border); }
.admin-table td { padding: 14px 16px; border-bottom: 1px solid var(--border); font-size: 14px; font-weight: 600; vertical-align: middle; }
.admin-table tr:last-child td { border-bottom: none; }
.admin-table tr:hover td { background: var(--surface2); }

.badge { display: inline-flex; align-items: center; gap: 4px; padding: 3px 10px; border-radius: 20px; font-size: 12px; font-weight: 800; }
.badge-success { background: #43D9AD20; color: #1A9B7A; }
.badge-muted { background: var(--surface2); color: var(--text-muted); }
.badge-primary { background: #6C63FF20; color: var(--primary); }

/* BLOCK EDITOR */
.block-editor { display: flex; flex-direction: column; gap: 12px; margin: 16px 0; }
.block-item { background: var(--surface2); border: 2px solid var(--border); border-radius: var(--radius-sm); padding: 16px; cursor: pointer; transition: var(--transition); position: relative; }
.block-item:hover { border-color: var(--primary); }
.block-item.content-type { border-left: 4px solid var(--primary); }
.block-item.question-type { border-left: 4px solid var(--secondary); }
.block-item-header { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; }
.block-type-badge { font-size: 10px; font-weight: 800; padding: 2px 8px; border-radius: 20px; }
.block-type-badge.content { background: #6C63FF20; color: var(--primary); }
.block-type-badge.question { background: #FF6B6B20; color: var(--secondary); }
.block-preview { font-size: 13px; color: var(--text-muted); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; max-width: 400px; }
.block-actions { position: absolute; top: 12px; right: 12px; display: flex; gap: 6px; }
.add-block-btns { display: flex; gap: 10px; }

/* LEADERBOARD */
.leaderboard-list { display: flex; flex-direction: column; gap: 10px; }
.leaderboard-item { display: flex; align-items: center; gap: 14px; background: white; border-radius: var(--radius); border: 1px solid var(--border); padding: 14px 18px; }
.leaderboard-rank { font-size: 18px; font-weight: 900; min-width: 32px; }
.leaderboard-rank.top3 { color: var(--warning); }

/* EMPTY STATE */
.empty-state { text-align: center; padding: 60px 20px; }
.empty-icon { font-size: 60px; margin-bottom: 16px; }
.empty-title { font-size: 20px; font-weight: 800; margin-bottom: 8px; }
.empty-desc { color: var(--text-muted); font-weight: 600; }

/* RESPONSIVE */
@media (max-width: 900px) {
  .app-layout { grid-template-columns: 1fr; }
  .sidebar { display: none; }
  .main-content { padding: 16px 4px 50px; }
  .lesson-item { margin: 0 4px 8px; }
  .lesson-list { overflow-x: hidden; }
  
  /* Ajustes para login en movil */
  .auth-page { grid-template-columns: 1fr; }
  .auth-left { display: none; }
  .auth-right { padding: 20px 10px; background: var(--surface2); }
  .auth-box { padding: 24px 20px; box-shadow: var(--shadow-sm); }
  
  /* Ajustes de espacio interior para lecciones en movil */
  .content-block-header, .question-block-header { padding: 12px 16px 8px; }
  .content-block-body { padding: 16px; }
  .question-text { padding: 16px !important; }
  .options-list, .fill-blank-input { padding: 0 16px 16px; }
  .answer-feedback { padding: 12px; margin: 0 16px 16px; }
  .code-block { padding: 12px; margin-top: 12px; }
}

  /* Barra de navegación inferior */
  .mobile-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: white;
    border-top: 1px solid var(--border);
    z-index: 1000;
    padding: 4px 0;
    padding-bottom: calc(4px + env(safe-area-inset-bottom));
  }
  .mobile-nav-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 2px 0;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-muted);
    font-size: 9px;
    font-weight: 700;
  }
  .mobile-nav-item.active { color: var(--primary); }
  .mobile-nav-item .nav-emoji { font-size: 20px; }

@media (min-width: 901px) {
  .mobile-nav { display: none; }
}


/* UTILITIES */
.hidden { display: none !important; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

/* Estilos para contenido generado por Quill */
.ql-content { font-size: 16px; line-height: 1.7; font-weight: 600; }
.ql-content p { margin-bottom: 10px; }
.ql-content strong { font-weight: 900; }
.ql-content em { font-style: italic; }
.ql-content ul, .ql-content ol { padding-left: 20px; margin-bottom: 10px; }
.ql-content li { margin-bottom: 4px; }
.ql-content .ql-size-large { font-size: 1.2em; }
.ql-content .ql-size-huge { font-size: 1.5em; }
.ql-content .ql-size-small { font-size: 0.85em; }

.CodeMirror { font-size: 13px; }
.CodeMirror-gutters { min-width: 32px !important; }
.CodeMirror-linenumber { padding: 0 6px 0 6px !important; }


/* TEMA OSCURO */
[data-theme="dark"] {
  --primary: #8B85FF;
  --primary-light: #A8A4FF;
  --primary-dark: #6C63FF;
  --secondary: #FF8585;
  --accent: #43D9AD;
  --warning: #FFB347;
  --bg: #0F1117;
  --surface: #1A1D2E;
  --surface2: #222538;
  --border: #2E3250;
  --text: #E8EAFF;
  --text-muted: #9CA3AF;
  --text-light: #6B7280;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
}
[data-theme="dark"] body { background: var(--bg); color: var(--text); }
[data-theme="dark"] .sidebar { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .card { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .form-control { background: var(--surface2); border-color: var(--border); color: var(--text); }
[data-theme="dark"] .modal { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .modal-overlay { background: rgba(0,0,0,0.7); }
[data-theme="dark"] .nav-item:hover { background: var(--surface2); }
[data-theme="dark"] .lesson-item { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .lesson-block { background: var(--surface); }
[data-theme="dark"] .content-block { background: var(--surface2); }
[data-theme="dark"] .question-block { background: var(--surface2); }
[data-theme="dark"] .option-btn { background: var(--surface); border-color: var(--border); color: var(--text); }
[data-theme="dark"] .mobile-nav { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] input, [data-theme="dark"] select, [data-theme="dark"] textarea { background: var(--surface2) !important; color: var(--text) !important; border-color: var(--border) !important; }
[data-theme="dark"] .stat-card { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .topic-card { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .achievement-card { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .leaderboard-item { background: var(--surface); border-color: var(--border); }
[data-theme="dark"] .admin-table { background: var(--surface); }
[data-theme="dark"] .admin-table th { background: var(--surface2); color: var(--text-muted); border-color: var(--border); }
[data-theme="dark"] .btn-secondary { background: var(--surface2); border-color: var(--border); color: var(--text); }

/* TEMA MONOKAI */
[data-theme="monokai"] {
  --primary: #f92672;
  --primary-light: #ff669d;
  --primary-dark: #d21255;
  --secondary: #ae81ff;
  --accent: #a6e22e;
  --warning: #fd971f;
  --bg: #272822;
  --surface: #1e1e19;
  --surface2: #3e3d32;
  --border: #49483e;
  --text: #f8f8f2;
  --text-muted: #75715e;
  --text-light: #525043;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
}
[data-theme="monokai"] body { background: var(--bg); color: var(--text); }
[data-theme="monokai"] .sidebar { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .card { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .form-control { background: var(--surface2); border-color: var(--border); color: var(--text); }
[data-theme="monokai"] .modal { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .modal-overlay { background: rgba(0,0,0,0.7); }
[data-theme="monokai"] .nav-item:hover { background: var(--surface2); }
[data-theme="monokai"] .lesson-item { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .lesson-block { background: var(--surface); }
[data-theme="monokai"] .content-block { background: var(--surface2); }
[data-theme="monokai"] .question-block { background: var(--surface2); }
[data-theme="monokai"] .option-btn { background: var(--surface); border-color: var(--border); color: var(--text); }
[data-theme="monokai"] .mobile-nav { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] input, [data-theme="monokai"] select, [data-theme="monokai"] textarea { background: var(--surface2) !important; color: var(--text) !important; border-color: var(--border) !important; }
[data-theme="monokai"] .stat-card { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .topic-card { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .achievement-card { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .leaderboard-item { background: var(--surface); border-color: var(--border); }
[data-theme="monokai"] .admin-table { background: var(--surface); }
[data-theme="monokai"] .admin-table th { background: var(--surface2); color: var(--text-muted); border-color: var(--border); }
[data-theme="monokai"] .admin-table td { border-color: var(--border); color: var(--text); }
[data-theme="monokai"] .btn-secondary { background: var(--surface2); border-color: var(--border); color: var(--text); }

/* TEMA TOKYO NIGHT */
[data-theme="tokyo-night"] {
  --primary: #7aa2f7;
  --primary-light: #8db1ff;
  --primary-dark: #648ee4;
  --secondary: #f7768e;
  --accent: #9ece6a;
  --warning: #e0af68;
  --bg: #1a1b26;
  --surface: #1f2335;
  --surface2: #292e42;
  --border: #3b4261;
  --text: #c0caf5;
  --text-muted: #565f89;
  --text-light: #414868;
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow: 0 4px 20px rgba(0,0,0,0.4);
  --shadow-lg: 0 8px 40px rgba(0,0,0,0.5);
}
[data-theme="tokyo-night"] body { background: var(--bg); color: var(--text); }
[data-theme="tokyo-night"] .sidebar { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .form-control { background: var(--surface2); border-color: var(--border); color: var(--text); }
[data-theme="tokyo-night"] .modal { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .modal-overlay { background: rgba(0,0,0,0.7); }
[data-theme="tokyo-night"] .nav-item:hover { background: var(--surface2); }
[data-theme="tokyo-night"] .lesson-item { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .lesson-block { background: var(--surface); }
[data-theme="tokyo-night"] .content-block { background: var(--surface2); }
[data-theme="tokyo-night"] .question-block { background: var(--surface2); }
[data-theme="tokyo-night"] .option-btn { background: var(--surface); border-color: var(--border); color: var(--text); }
[data-theme="tokyo-night"] .mobile-nav { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] input, [data-theme="tokyo-night"] select, [data-theme="tokyo-night"] textarea { background: var(--surface2) !important; color: var(--text) !important; border-color: var(--border) !important; }
[data-theme="tokyo-night"] .stat-card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .topic-card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .achievement-card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .leaderboard-item { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night"] .admin-table { background: var(--surface); }
[data-theme="tokyo-night"] .admin-table th { background: var(--surface2); color: var(--text-muted); border-color: var(--border); }
[data-theme="tokyo-night"] .admin-table td { border-color: var(--border); color: var(--text); }
[data-theme="tokyo-night"] .btn-secondary { background: var(--surface2); border-color: var(--border); color: var(--text); }

/* TEMA TOKYO NIGHT LIGHT */
[data-theme="tokyo-night-light"] {
  --primary: #34548a;
  --primary-light: #4c6a9c;
  --primary-dark: #244275;
  --secondary: #8c4351;
  --accent: #33635c;
  --warning: #8f5e15;
  --bg: #d5d6db;
  --surface: #e1e2e7;
  --surface2: #c4c8da;
  --border: #9699a3;
  --text: #343b58;
  --text-muted: #565a6e;
  --text-light: #9699a3;
  --shadow-sm: 0 2px 8px rgba(52,84,138,0.08);
  --shadow: 0 4px 20px rgba(52,84,138,0.12);
  --shadow-lg: 0 8px 40px rgba(52,84,138,0.18);
}
[data-theme="tokyo-night-light"] body { background: var(--bg); color: var(--text); }
[data-theme="tokyo-night-light"] .sidebar { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .form-control { background: var(--surface2); border-color: var(--border); color: var(--text); }
[data-theme="tokyo-night-light"] .modal { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .modal-overlay { background: rgba(52,59,88,0.5); }
[data-theme="tokyo-night-light"] .nav-item:hover { background: var(--surface2); }
[data-theme="tokyo-night-light"] .lesson-item { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .lesson-block { background: var(--surface); }
[data-theme="tokyo-night-light"] .content-block { background: var(--surface2); }
[data-theme="tokyo-night-light"] .question-block { background: var(--surface2); }
[data-theme="tokyo-night-light"] .option-btn { background: var(--surface); border-color: var(--border); color: var(--text); }
[data-theme="tokyo-night-light"] .mobile-nav { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] input, [data-theme="tokyo-night-light"] select, [data-theme="tokyo-night-light"] textarea { background: var(--surface2) !important; color: var(--text) !important; border-color: var(--border) !important; }
[data-theme="tokyo-night-light"] .stat-card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .topic-card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .achievement-card { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .leaderboard-item { background: var(--surface); border-color: var(--border); }
[data-theme="tokyo-night-light"] .admin-table { background: var(--surface); }
[data-theme="tokyo-night-light"] .admin-table th { background: var(--surface2); color: var(--text-muted); border-color: var(--border); }
[data-theme="tokyo-night-light"] .admin-table td { border-color: var(--border); color: var(--text); }
[data-theme="tokyo-night-light"] .btn-secondary { background: var(--surface2); border-color: var(--border); color: var(--text); }

/* ESTILOS PARA IMPRESIÓN (PDF) */
@media print {
  body {
    background: transparent !important;
  }
  .sidebar, .mobile-nav, .no-print, #toast-container {
    display: none !important;
  }
  .main-wrapper {
    margin-left: 0 !important;
    padding: 0 !important;
    width: 100% !important;
  }
  .main-content {
    margin: 0 !important;
    padding: 0 !important;
  }
  .report-container {
    max-width: 100% !important;
  }
  
  /* Compresión extrema para ahorrar hojas carta */
  .report-header {
    padding-top: 0 !important;
    margin-bottom: 15px !important;
  }
  .report-header h1 {
    font-size: 18px !important;
    margin-bottom: 4px !important;
  }
  .report-header div {
    font-size: 11px !important;
  }
  .report-block {
    padding: 8px 12px !important;
    margin-bottom: 10px !important;
  }
  .report-block > div {
    margin-bottom: 8px !important;
    padding-bottom: 8px !important;
    padding: 8px !important;
  }
  .report-block .ql-content {
    font-size: 11px !important;
    margin-bottom: 8px !important;
  }
  .report-block pre, .report-block span {
    font-size: 10px !important;
  }
  .report-block .badge {
    font-size: 9px !important;
    padding: 2px 4px !important;
  }
  
  .print-only {
    display: block !important;
  }
}