/*
   ______                            __
  / ____/___  ____ ___  ____  __  __/ /____  _____
 / /   / __ \/ __ `__ \/ __ \/ / / / __/ _ \/ ___/
/ /___/ /_/ / / / / / / /_/ / /_/ / /_/  __/ /
\____/\____/_/ /_/ /_/ .___/\__,_/\__/\___/_/
                    /_/
        Created with Perplexity Computer
*/

/* ===== DESIGN TOKENS ===== */
:root {
  /* Type Scale */
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1.05rem + 0.4vw,  1.3rem);
  --text-xl:   clamp(1.4rem,   1.2rem  + 0.7vw,  1.75rem);
  --text-2xl:  clamp(1.9rem,   1.2rem  + 2.2vw,  2.75rem);
  --text-3xl:  clamp(2.1rem,   1.4rem  + 2.6vw,  3.4rem);

  /* Spacing */
  --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;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Fixed chrome */
  --nav-height: 64px; /* .nav__inner: 2x space-3 + controles de 36-38px + borde */

  /* Fonts */
  --font-display: 'Clash Display', 'Cabinet Grotesk', 'Helvetica Neue', sans-serif;
  --font-body: 'Satoshi', 'Inter', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
}

/* LIGHT MODE — Cybersecurity: deep navy/teal palette */
:root, [data-theme="light"] {
  --color-bg:             #f0f4f8;
  --color-surface:        #f6f9fc;
  --color-surface-2:      #ffffff;
  --color-surface-offset: #e4ecf4;
  --color-surface-offset-2: #dce6f0;
  --color-surface-dynamic: #cdd9e8;
  --color-divider:        #c5d4e4;
  --color-border:         #b8c9dc;

  --color-text:           #0d1b2a;
  --color-text-muted:     #4a6480;
  --color-text-faint:     #8fafc8;
  --color-text-inverse:   #f0f6fc;

  /* Primary — Cian/Teal de ciberseguridad */
  --color-primary:        #0077a8;
  --color-primary-hover:  #005a82;
  --color-primary-active: #003d5e;
  --color-primary-highlight: #c2dded;

  /* Accent — Verde seguridad */
  --color-success:        #1a7a4a;
  --color-success-hover:  #125c37;
  --color-success-active: #0a3f25;
  --color-success-highlight: #c6e8d7;

  /* Warning — Naranja alerta */
  --color-warning:        #c05c00;
  --color-warning-hover:  #924500;
  --color-warning-active: #622e00;
  --color-warning-highlight: #f0d9c4;

  /* Error/Danger — Rojo amenaza */
  --color-error:          #c0392b;
  --color-error-hover:    #922c20;
  --color-error-active:   #641e16;
  --color-error-highlight: #f5c6c1;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,40,80,0.07);
  --shadow-md: 0 4px 16px rgba(0,40,80,0.10);
  --shadow-lg: 0 12px 36px rgba(0,40,80,0.14);
}

/* DARK MODE — js/main.js asigna data-theme según la preferencia del sistema */
[data-theme="dark"] {
  --color-bg:             #070e16;
  --color-surface:        #0d1825;
  --color-surface-2:      #112030;
  --color-surface-offset: #0a1520;
  --color-surface-offset-2: #121d2b;
  --color-surface-dynamic: #1a2c3e;
  --color-divider:        #1e2f42;
  --color-border:         #263e57;
  --color-text:           #c8dff0;
  --color-text-muted:     #6a90b0;
  --color-text-faint:     #3a5a78;
  --color-text-inverse:   #0d1b2a;
  --color-primary:        #3fb8e8;
  --color-primary-hover:  #22a0d4;
  --color-primary-active: #1280aa;
  --color-primary-highlight: #1c3a4f;
  --color-success:        #3cc97a;
  --color-success-hover:  #2aab62;
  --color-success-active: #1a8a4a;
  --color-success-highlight: #1a3d2c;
  --color-warning:        #f59e42;
  --color-warning-hover:  #e8882a;
  --color-warning-active: #c86a10;
  --color-warning-highlight: #3d2c14;
  --color-error:          #f56b5c;
  --color-error-hover:    #e24a3a;
  --color-error-active:   #c02a1c;
  --color-error-highlight: #3a1a16;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.25);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 36px rgba(0,0,0,0.45);
}

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

html {
  -moz-text-size-adjust: none;
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--space-4));
}

body {
  min-height: 100dvh;
  line-height: 1.65;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color 0.3s, color 0.3s;
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
ul[role="list"], ol[role="list"] { list-style: none; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.2; }
p, li, figcaption { text-wrap: pretty; }

::selection {
  background: var(--color-primary-highlight);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

button { cursor: pointer; background: none; border: none; }

a, button, [role="button"], input, textarea, select {
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive);
}

.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;
}

/* ===== LAYOUT ===== */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-4), 5vw, var(--space-12));
}
.container--narrow { max-width: var(--content-narrow); }
.container--default { max-width: var(--content-default); }

/* ===== NAVIGATION ===== */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--color-surface) 92%, transparent);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-3);
  gap: var(--space-4);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--color-text);
}

.nav__logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.nav__logo-title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.02em;
}

.nav__logo-sub {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 400;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav__links a {
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
}

.nav__links a:hover, .nav__links a.active {
  color: var(--color-primary);
  background: var(--color-primary-highlight);
}

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

.btn-theme {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
}

.btn-theme:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* Mobile menu toggle */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 36px;
  height: 36px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
}

.nav__hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--color-text-muted);
  transition: all var(--transition-interactive);
}

@media (max-width: 768px) {
  .nav__hamburger { display: flex; }
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-4);
    gap: var(--space-2);
    box-shadow: var(--shadow-md);
    align-items: stretch;
  }
  .nav__links.open { display: flex; }
  .nav__links a { padding: var(--space-3) var(--space-4); }
}

/* ===== HERO ===== */
.hero {
  padding-block: clamp(var(--space-8), 5vw, var(--space-12));
  background: var(--color-bg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, 
    color-mix(in srgb, var(--color-primary) 12%, transparent) 0%,
    transparent 70%);
  pointer-events: none;
}

.hero__grid-bg {
  position: absolute;
  inset: 0;
  background-image: 
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.3;
  pointer-events: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 860px;
  margin-inline: auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-6);
  border: 1px solid color-mix(in srgb, var(--color-primary) 30%, transparent);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  line-height: 1.08;
}

.hero__title span { color: var(--color-primary); }

.hero__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 62ch;
  margin-inline: auto;
  margin-bottom: var(--space-8);
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-interactive);
  line-height: 1;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: 0 4px 20px color-mix(in srgb, var(--color-primary) 35%, transparent);
  transform: translateY(-1px);
}

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary-highlight);
  box-shadow: 0 4px 16px color-mix(in srgb, var(--color-primary) 20%, transparent);
}

.btn--danger {
  background: var(--color-error);
  color: #fff;
  border-color: var(--color-error);
}

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

.btn--sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-xs);
}

/* ===== STATS BANNER ===== */
.stats {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-6);
}

.stats__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: var(--space-5);
  text-align: center;
}

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

.stats__number {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stats__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
}

/* ===== SECTION ===== */
.section {
  padding-block: clamp(var(--space-10), 5vw, var(--space-16));
}

.section__header {
  margin-bottom: var(--space-8);
}

.section__label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.1;
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 62ch;
  line-height: 1.65;
}

/* ===== MODULE CARDS ===== */
.modules-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--space-6);
}

.module-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-interactive);
  position: relative;
  overflow: hidden;
}

.module-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--module-accent, var(--color-primary));
  opacity: 0;
  transition: opacity var(--transition-interactive);
}

.module-card:hover {
  border-color: var(--module-accent, var(--color-primary));
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.module-card:hover::before { opacity: 1; }

.module-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  background: var(--module-bg, var(--color-primary-highlight));
  color: var(--module-accent, var(--color-primary));
  flex-shrink: 0;
}

.module-card__badge {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--module-bg, var(--color-primary-highlight));
  color: var(--module-accent, var(--color-primary));
}

.module-card__num {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.module-card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.25;
}

.module-card__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  flex: 1;
}

.module-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-4);
  border-top: 1px solid var(--color-divider);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.module-card__arrow {
  color: var(--module-accent, var(--color-primary));
  transition: transform var(--transition-interactive);
}

.module-card:hover .module-card__arrow { transform: translateX(4px); }

/* ===== MODULE PAGE ===== */
.module-page {
  padding-block: clamp(var(--space-6), 3vw, var(--space-10));
}

.module-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: clamp(var(--space-8), 4vw, var(--space-12));
  margin-bottom: 0; /* el espacio inferior lo aporta .module-page (evita doble separación) */
  position: relative;
  overflow: hidden;
}

.module-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 100% at 100% 50%,
    color-mix(in srgb, var(--module-accent, var(--color-primary)) 10%, transparent),
    transparent 70%);
  pointer-events: none;
}

.module-header__breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.module-header__breadcrumb a { color: var(--color-primary); text-decoration: none; }
.module-header__breadcrumb a:hover { text-decoration: underline; }

.module-header__tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  margin-bottom: var(--space-3);
}

.module-header__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-3);
  max-width: 720px;
}

.module-header__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 62ch;
  line-height: 1.6;
}

/* ===== CONTENT LAYOUT ===== */
.content-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-10);
  align-items: start;
}

@media (max-width: 900px) {
  .content-layout { grid-template-columns: 1fr; }
}

/* ===== CONTENT CARD ===== */
.content-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  margin-bottom: var(--space-6);
}

.content-card h2 {
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 1.25rem + 0.5vw, 1.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}

.content-card h3 {
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 1.05rem + 0.3vw, 1.17rem);
  font-weight: 600;
  color: var(--color-text);
  margin-top: var(--space-6);
  margin-bottom: var(--space-3);
}

.content-card p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  line-height: 1.75;
  max-width: 72ch;
}

.content-card ul, .content-card ol {
  padding-left: var(--space-6);
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.content-card li {
  margin-bottom: var(--space-2);
  line-height: 1.65;
}

/* ===== ALERT BOX ===== */
.alert {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-5) var(--space-6);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-6);
  border-left: 4px solid;
}

.alert--warning {
  background: var(--color-warning-highlight);
  border-color: var(--color-warning);
  color: var(--color-warning-active);
}

.alert--danger {
  background: var(--color-error-highlight);
  border-color: var(--color-error);
  color: var(--color-error-active);
}

.alert--success {
  background: var(--color-success-highlight);
  border-color: var(--color-success);
  color: var(--color-success-active);
}

.alert--info {
  background: var(--color-primary-highlight);
  border-color: var(--color-primary);
  color: var(--color-primary-active);
}

[data-theme="dark"] .alert--warning { color: var(--color-warning); }
[data-theme="dark"] .alert--danger { color: var(--color-error); }
[data-theme="dark"] .alert--success { color: var(--color-success); }
[data-theme="dark"] .alert--info { color: var(--color-primary); }

.alert__icon { font-size: 1.4rem; flex-shrink: 0; line-height: 1; }
.alert__content { flex: 1; }
.alert__title { font-weight: 700; font-size: var(--text-sm); margin-bottom: var(--space-1); }
.alert__text { font-size: var(--text-sm); line-height: 1.6; }

/* ===== VIDEO EMBED ===== */
.video-container {
  border-radius: var(--radius-xl);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
  background: var(--color-surface-offset);
  box-shadow: var(--shadow-md);
}

.video-container__title {
  padding: var(--space-4) var(--space-5);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.video-container__title::before {
  content: '▶';
  color: var(--color-error);
  font-size: 0.7em;
}

.video-responsive {
  position: relative;
  padding-top: 56.25%;
}

.video-responsive iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ===== YOUTUBE LITE PLAYER ===== */
.yt-player {
  position: relative;
  display: block;
  width: 100%;
  padding-top: 56.25%;
  background: #000;
  cursor: pointer;
  overflow: hidden;
  border-radius: 0;
}
.yt-player__poster {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 0.2s, transform 0.3s;
  display: block;
}
.yt-player:hover .yt-player__poster {
  opacity: 0.85;
  transform: scale(1.02);
}
.yt-player__btn {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 68px;
  height: 48px;
  background: #ff0000;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 20px rgba(0,0,0,0.5);
  transition: background 0.2s, transform 0.2s;
  pointer-events: none;
}
.yt-player:hover .yt-player__btn {
  background: #cc0000;
  transform: translate(-50%, -50%) scale(1.1);
}
.yt-player__btn svg { pointer-events: none; }
.yt-player__label {
  position: absolute;
  bottom: 0;
  left: 0; right: 0;
  padding: var(--space-2) var(--space-3);
  background: linear-gradient(transparent, rgba(0,0,0,0.75));
  color: white;
  font-size: var(--text-xs);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.yt-player iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: none;
}

/* ===== QUIZ ===== */
.quiz-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.quiz-card__header {
  padding: var(--space-5) var(--space-6);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.quiz-card__header h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.quiz-card__body { padding: var(--space-6); }

.quiz-question {
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-divider);
}

.quiz-question:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.quiz-question__text {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  line-height: 1.5;
}

.quiz-question__num {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.07em;
  display: block;
  margin-bottom: var(--space-2);
}

.quiz-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.quiz-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-interactive);
  background: var(--color-surface-2);
}

.quiz-option:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.quiz-option input[type="radio"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 1px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.quiz-option label {
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.5;
}

.quiz-option.correct {
  border-color: var(--color-success);
  background: var(--color-success-highlight);
}

.quiz-option.incorrect {
  border-color: var(--color-error);
  background: var(--color-error-highlight);
}

.quiz-feedback {
  margin-top: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  line-height: 1.55;
  display: none;
}

.quiz-feedback.show { display: block; }
.quiz-feedback.correct { background: var(--color-success-highlight); color: var(--color-success); }
.quiz-feedback.incorrect { background: var(--color-error-highlight); color: var(--color-error); }

[data-theme="dark"] .quiz-feedback.correct { color: var(--color-success); }
[data-theme="dark"] .quiz-feedback.incorrect { color: var(--color-error); }

.quiz-actions {
  padding: var(--space-5) var(--space-6);
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.quiz-score {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 600;
}

.quiz-score span {
  color: var(--color-primary);
  font-family: var(--font-display);
  font-size: var(--text-lg);
}

/* ===== SIDEBAR ===== */
.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  position: sticky;
  top: calc(var(--nav-height) + var(--space-4));
  align-self: start;
  /* Sin max-height/overflow: el scrollbar interno se veía mal.
     La lista es corta; si creciera, valorar sticky solo en >1080px de alto. */
}

@media (max-width: 900px) {
  /* En una sola columna el sidebar fluye con el contenido */
  .sidebar {
    position: static;
    max-height: none;
    overflow: visible;
  }
}

.sidebar-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-5);
}

.sidebar-card__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  padding-bottom: var(--space-3);
  border-bottom: 1px solid var(--color-divider);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  list-style: none;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: all var(--transition-interactive);
}

.sidebar-nav a:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.sidebar-nav a.active,
.sidebar-nav a[aria-current="page"] {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  font-weight: 600;
  box-shadow: inset 3px 0 0 0 var(--color-primary);
}

.sidebar-nav a .dot {
  width: 8px; height: 8px;
  border-radius: var(--radius-full);
  background: var(--color-border);
  flex-shrink: 0;
  transition: background var(--transition-interactive);
}

.sidebar-nav a:hover .dot {
  background: var(--color-text-faint);
}

.sidebar-nav a.active .dot,
.sidebar-nav a[aria-current="page"] .dot {
  background: var(--color-primary);
}

/* ===== PROGRESS INDICATOR ===== */
.progress-ring {
  position: relative;
  width: 64px;
  height: 64px;
  flex-shrink: 0;
}

.progress-ring circle {
  fill: none;
  stroke-width: 5;
}

.progress-ring__bg { stroke: var(--color-divider); }
.progress-ring__fg { 
  stroke: var(--color-primary); 
  stroke-linecap: round;
  transform: rotate(-90deg);
  transform-origin: center;
  transition: stroke-dashoffset 0.5s ease;
}

.progress-ring__text {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
}

/* ===== EXERCISE ===== */
.exercise-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.exercise-card__header {
  padding: var(--space-4) var(--space-6);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.exercise-card__icon {
  width: 36px; height: 36px;
  border-radius: var(--radius-md);
  background: var(--color-primary-highlight);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  color: var(--color-primary);
}

.exercise-card__title {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.exercise-card__type {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.exercise-card__body { padding: var(--space-6); }

/* Phishing simulation */
.email-mock {
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: var(--space-5);
  font-family: var(--font-body);
}

.email-mock__toolbar {
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  display: flex;
  gap: var(--space-2);
}

.email-mock__dot {
  width: 10px; height: 10px;
  border-radius: 50%;
}

.email-mock__headers {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.email-mock__header-row {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  align-items: flex-start;
}

.email-mock__header-label {
  font-weight: 700;
  color: var(--color-text-faint);
  min-width: 56px;
  flex-shrink: 0;
}

.email-mock__header-value { color: var(--color-text); }

.email-mock__body {
  padding: var(--space-5);
  background: var(--color-surface-2);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-text);
}

.email-mock__body a {
  color: var(--color-primary);
}

.email-suspicious {
  background: linear-gradient(135deg, 
    color-mix(in srgb, var(--color-warning) 5%, var(--color-surface-2)),
    var(--color-surface-2));
}

.suspicious-marker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  background: var(--color-warning-highlight);
  color: var(--color-warning);
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 600;
  border: 1px solid var(--color-warning);
  cursor: help;
  position: relative;
}

[data-theme="dark"] .suspicious-marker { color: var(--color-warning); }

.exercise-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.exercise-checklist li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.exercise-checklist input[type="checkbox"] {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.exercise-checklist label {
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.5;
}

/* ===== SCENARIO CARDS ===== */
.scenario {
  background: var(--color-surface-offset);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  margin-bottom: var(--space-5);
  position: relative;
}

.scenario__badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.scenario__badge--danger {
  background: var(--color-error-highlight);
  color: var(--color-error);
}

.scenario__badge--warning {
  background: var(--color-warning-highlight);
  color: var(--color-warning);
}

[data-theme="dark"] .scenario__badge--danger { color: var(--color-error); }
[data-theme="dark"] .scenario__badge--warning { color: var(--color-warning); }

.scenario__title {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
  margin-bottom: var(--space-3);
  padding-right: var(--space-16);
}

.scenario__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  margin-bottom: var(--space-4);
}

/* ===== FOOTER ===== */
.footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-10);
  margin-top: var(--space-12);
}

.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}

@media (max-width: 768px) {
  .footer__grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
}

@media (max-width: 480px) {
  .footer__grid { grid-template-columns: 1fr; }
}

.footer__brand p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 280px;
  line-height: 1.7;
  margin-top: var(--space-3);
}

.footer__col-title {
  font-size: var(--text-xs);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
}

.footer__links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-interactive);
}

.footer__links a:hover { color: var(--color-primary); }

.footer__bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__attribution {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__attribution a {
  color: var(--color-primary);
  text-decoration: none;
}

.footer__attribution a:hover { text-decoration: underline; }

/* ===== EVALUATION PAGE ===== */
.eval-intro {
  text-align: center;
  padding: clamp(var(--space-8), 4vw, var(--space-10));
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-8);
}

.eval-intro__icon {
  font-size: 3.5rem;
  margin-bottom: var(--space-5);
}

.eval-intro h2 {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-4);
}

.eval-intro p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 520px;
  margin-inline: auto;
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

.eval-meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  flex-wrap: wrap;
  margin-bottom: var(--space-8);
}

.eval-meta__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.eval-meta__item span { font-weight: 700; color: var(--color-primary); }

.eval-form {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  margin-bottom: var(--space-6);
}

.eval-form__header {
  padding: var(--space-5) var(--space-8);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-border);
}

.eval-form__body { padding: var(--space-8); }

.eval-question {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-divider);
}

.eval-question:last-child { border-bottom: none; }

.eval-question__num {
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-primary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-2);
}

.eval-question__text {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-5);
  line-height: 1.5;
}

.eval-options {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.eval-option {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-interactive);
  background: var(--color-surface-2);
}

.eval-option:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.eval-option.selected {
  border-color: var(--color-primary);
  background: var(--color-primary-highlight);
}

.eval-option input[type="radio"] {
  width: 18px; height: 18px;
  flex-shrink: 0;
  margin-top: 2px;
  accent-color: var(--color-primary);
  cursor: pointer;
}

.eval-option label {
  font-size: var(--text-sm);
  color: var(--color-text);
  cursor: pointer;
  line-height: 1.55;
}

.eval-result-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-10);
  text-align: center;
  display: none;
}

.eval-result-panel.show { display: block; }

.eval-result-panel__score {
  font-family: var(--font-display);
  font-size: clamp(4rem, 10vw, 7rem);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 1;
  margin-bottom: var(--space-4);
}

.score--excellent { color: var(--color-success); }
.score--good { color: var(--color-primary); }
.score--needs-work { color: var(--color-warning); }
.score--fail { color: var(--color-error); }

.eval-result-panel h3 {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-3);
}

.eval-result-panel p {
  color: var(--color-text-muted);
  max-width: 460px;
  margin-inline: auto;
  line-height: 1.65;
  margin-bottom: var(--space-8);
}

.eval-result-breakdown {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-4);
  margin-bottom: var(--space-8);
  text-align: left;
}

.breakdown-item {
  padding: var(--space-4);
  background: var(--color-surface-offset);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.breakdown-item__topic {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-2);
}

.breakdown-item__score {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-primary);
}

/* ===== PROGRESS BAR ===== */
.progress-bar-wrap {
  background: var(--color-surface-offset);
  border-radius: var(--radius-full);
  height: 6px;
  overflow: hidden;
  margin-bottom: var(--space-2);
}

.progress-bar {
  height: 100%;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  transition: width 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

/* ===== CODE BLOCK ===== */
.code-block {
  background: var(--color-surface-offset);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text);
  overflow-x: auto;
  margin-bottom: var(--space-5);
}

/* ===== TIPS GRID ===== */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--space-5);
  margin-top: var(--space-6);
}

.tip-card {
  padding: var(--space-5);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  border-left: 3px solid var(--tip-color, var(--color-primary));
}

.tip-card__icon {
  font-size: 1.6rem;
  margin-bottom: var(--space-3);
}

.tip-card__title {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.tip-card__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ===== UTILITY ===== */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.hidden { display: none; }

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.tag--blue { background: var(--color-primary-highlight); color: var(--color-primary); border-color: color-mix(in srgb, var(--color-primary) 25%, transparent); }
.tag--red { background: var(--color-error-highlight); color: var(--color-error); border-color: color-mix(in srgb, var(--color-error) 25%, transparent); }
.tag--green { background: var(--color-success-highlight); color: var(--color-success); border-color: color-mix(in srgb, var(--color-success) 25%, transparent); }
.tag--orange { background: var(--color-warning-highlight); color: var(--color-warning); border-color: color-mix(in srgb, var(--color-warning) 25%, transparent); }

[data-theme="dark"] .tag--red { color: var(--color-error); }
[data-theme="dark"] .tag--green { color: var(--color-success); }
[data-theme="dark"] .tag--orange { color: var(--color-warning); }