/* =====================================================
   PROFE. GATICA - Clases Online
   styles.css - Estilos globales del sitio
   ===================================================== */

/* === VARIABLES Y RESET === */
:root {
  --color-bg: #020b18;
  --color-bg2: #050f1f;
  --color-panel: rgba(6, 22, 46, 0.85);
  --color-glass: rgba(10, 30, 60, 0.6);
  --color-border: rgba(0, 180, 255, 0.2);
  --color-accent: #00b4ff;
  --color-accent2: #0066ff;
  --color-neon: #00e5ff;
  --color-neon2: #7b2fff;
  --color-text: #e0f0ff;
  --color-text-muted: #7a9ab8;
  --color-card-hover: rgba(0, 180, 255, 0.08);
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-mono: 'Consolas', 'Courier New', monospace;
  --radius: 16px;
  --radius-sm: 8px;
  --shadow-glow: 0 0 30px rgba(0, 180, 255, 0.25);
  --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.5);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-main);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.6;
}

/* === FONDO ANIMADO === */
body::before {
  content: '';
  position: fixed;
  top: 0; left: 0;
  width: 100%; height: 100%;
  background:
    radial-gradient(ellipse at 20% 20%, rgba(0, 102, 255, 0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 80%, rgba(123, 47, 255, 0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 0%, rgba(0, 180, 255, 0.05) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

/* === SCROLLBAR === */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg); }
::-webkit-scrollbar-thumb { background: var(--color-accent2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--color-accent); }

/* === NAVBAR === */
.navbar {
  position: sticky;
  top: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 32px;
  height: 70px;
  background: rgba(2, 11, 24, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.navbar-logo {
  height: 46px;
  width: 46px;
  object-fit: contain;
  filter: drop-shadow(0 0 8px rgba(0, 180, 255, 0.4));
  border-radius: 50%;
}

.navbar-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: 0.03em;
  line-height: 1.2;
}

.navbar-title span {
  display: block;
  font-size: 0.72rem;
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
}

.navbar-links a {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
  border: 1px solid transparent;
}

.navbar-links a:hover,
.navbar-links a.active {
  color: var(--color-accent);
  background: rgba(0, 180, 255, 0.08);
  border-color: var(--color-border);
}

/* Botón hamburguesa mobile */
.navbar-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border: none;
  background: transparent;
}

.navbar-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
  transition: var(--transition);
}

/* Menú mobile */
.mobile-menu {
  display: none;
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  background: rgba(2, 11, 24, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--color-border);
  padding: 16px;
  z-index: 999;
  flex-direction: column;
  gap: 4px;
}

.mobile-menu.open {
  display: flex;
}

.mobile-menu a {
  display: block;
  padding: 12px 16px;
  color: var(--color-text-muted);
  text-decoration: none;
  border-radius: 8px;
  transition: var(--transition);
  font-size: 0.95rem;
}

.mobile-menu a:hover {
  color: var(--color-accent);
  background: rgba(0, 180, 255, 0.08);
}

/* === HERO SECTION === */
.hero {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 80px 24px 60px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  background: rgba(0, 180, 255, 0.1);
  border: 1px solid rgba(0, 180, 255, 0.3);
  border-radius: 50px;
  font-size: 0.8rem;
  color: var(--color-accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 24px;
  animation: fadeInDown 0.6s ease forwards;
}

.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-neon);
  box-shadow: 0 0 8px var(--color-neon);
  animation: pulse 2s infinite;
}

@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.3; } }

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #ffffff 0%, var(--color-accent) 60%, var(--color-neon2) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: fadeInDown 0.7s ease 0.1s both;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--color-text-muted);
  max-width: 560px;
  margin: 0 auto 40px;
  animation: fadeInDown 0.7s ease 0.2s both;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* === BUSCADOR === */
.search-container {
  position: relative;
  max-width: 520px;
  margin: 0 auto 60px;
  animation: fadeInDown 0.7s ease 0.3s both;
}

.search-input {
  width: 100%;
  padding: 16px 50px 16px 20px;
  background: var(--color-glass);
  border: 1px solid var(--color-border);
  border-radius: 50px;
  color: var(--color-text);
  font-size: 1rem;
  font-family: var(--font-main);
  backdrop-filter: blur(10px);
  outline: none;
  transition: var(--transition);
}

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

.search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(0, 180, 255, 0.15), var(--shadow-glow);
}

.search-icon {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--color-accent);
  font-size: 1.1rem;
  pointer-events: none;
}

.search-results-count {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 10px;
  text-align: center;
  height: 20px;
  transition: var(--transition);
}

/* === SECCIÓN TÍTULO === */
.section-header {
  text-align: center;
  margin-bottom: 48px;
  position: relative;
  z-index: 1;
  padding: 0 24px;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section-header h2 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: var(--color-text);
}

.section-header p {
  color: var(--color-text-muted);
  max-width: 500px;
  margin: 12px auto 0;
  font-size: 0.95rem;
}

/* === GRID DE CARDS === */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 24px;
  padding: 0 32px 80px;
  max-width: 1300px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* === CARD === */
.card {
  position: relative;
  background: var(--color-glass);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
  overflow: hidden;
  backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  animation: cardFadeIn 0.5s ease both;
}

.card.hidden { display: none; }

@keyframes cardFadeIn {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Línea de color superior */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--card-accent, linear-gradient(90deg, var(--color-accent), var(--color-neon2)));
  opacity: 0.8;
  transition: opacity var(--transition);
}

/* Glow efecto hover */
.card::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 50% 0%, rgba(0, 180, 255, 0.08), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition);
}

.card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5), var(--shadow-glow);
  border-color: rgba(0, 180, 255, 0.4);
}

.card:hover::after { opacity: 1; }
.card:hover::before { opacity: 1; }

.card-icon {
  font-size: 2.6rem;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 60px;
  background: rgba(0, 180, 255, 0.08);
  border-radius: 12px;
  border: 1px solid rgba(0, 180, 255, 0.15);
  transition: var(--transition);
}

.card:hover .card-icon {
  background: rgba(0, 180, 255, 0.15);
  transform: scale(1.1);
  box-shadow: 0 0 20px rgba(0, 180, 255, 0.2);
}

.card-body { flex: 1; }

.card-category {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 6px;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--color-text);
}

.card-desc {
  font-size: 0.87rem;
  color: var(--color-text-muted);
  line-height: 1.5;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  margin-top: 8px;
  padding-top: 16px;
  border-top: 1px solid rgba(0, 180, 255, 0.1);
}

.card-level {
  font-size: 0.75rem;
  padding: 3px 10px;
  border-radius: 50px;
  font-weight: 500;
}

.level-basico { background: rgba(0, 210, 100, 0.1); color: #00d264; border: 1px solid rgba(0, 210, 100, 0.2); }
.level-intermedio { background: rgba(255, 160, 0, 0.1); color: #ffa000; border: 1px solid rgba(255, 160, 0, 0.2); }
.level-avanzado { background: rgba(255, 60, 100, 0.1); color: #ff3c64; border: 1px solid rgba(255, 60, 100, 0.2); }
.level-gui { background: rgba(123, 47, 255, 0.1); color: #a878ff; border: 1px solid rgba(123, 47, 255, 0.2); }

.card-arrow {
  font-size: 1.1rem;
  color: var(--color-accent);
  transition: transform var(--transition);
}

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

/* === EMPTY STATE (sin resultados) === */
.no-results {
  grid-column: 1 / -1;
  text-align: center;
  padding: 60px 24px;
  color: var(--color-text-muted);
  display: none;
}

.no-results.visible { display: block; }
.no-results-icon { font-size: 3rem; margin-bottom: 16px; opacity: 0.4; }
.no-results h3 { font-size: 1.2rem; margin-bottom: 8px; color: var(--color-text); }

/* === FOOTER === */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 40px 24px;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.85rem;
}

.footer-logo {
  height: 40px;
  object-fit: contain;
  opacity: 0.7;
  margin-bottom: 16px;
  filter: drop-shadow(0 0 6px rgba(0, 180, 255, 0.3));
}

.footer p { margin-bottom: 4px; }
.footer a { color: var(--color-accent); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* === PÁGINA DE TUTORIAL === */
.tutorial-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  min-height: calc(100vh - 70px);
  position: relative;
  z-index: 1;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 70px;
  height: calc(100vh - 70px);
  overflow-y: auto;
  padding: 32px 20px;
  background: rgba(4, 14, 30, 0.7);
  border-right: 1px solid var(--color-border);
}

.sidebar-overlay {
  display: none;
}

.sidebar-header {
  margin-bottom: 28px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--color-accent);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 180, 255, 0.2);
  transition: var(--transition);
  margin-bottom: 20px;
  width: fit-content;
}

.sidebar-back:hover {
  background: rgba(0, 180, 255, 0.1);
  border-color: var(--color-accent);
}

.sidebar-icon {
  font-size: 1.8rem;
  margin-bottom: 8px;
  display: block;
}

.sidebar-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.3;
}

.sidebar-subtitle {
  font-size: 0.78rem;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 4px;
}

.sidebar-nav {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.88rem;
  transition: var(--transition);
  border: 1px solid transparent;
}

.sidebar-nav li a:hover,
.sidebar-nav li a.active {
  color: var(--color-accent);
  background: rgba(0, 180, 255, 0.08);
  border-color: rgba(0, 180, 255, 0.15);
}

.sidebar-nav li a .nav-num {
  font-size: 0.72rem;
  background: rgba(0, 180, 255, 0.1);
  color: var(--color-accent);
  width: 22px;
  height: 22px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-weight: 700;
}

/* Contenido principal del tutorial */
.tutorial-content {
  padding: 48px 56px;
  max-width: 900px;
}

/* Secciones */
.tutorial-section {
  margin-bottom: 72px;
  animation: fadeInUp 0.5s ease both;
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(0, 180, 255, 0.1);
  border: 1px solid rgba(0, 180, 255, 0.2);
  border-radius: 50px;
  padding: 4px 14px;
  margin-bottom: 16px;
}

.tutorial-section h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 20px;
  line-height: 1.3;
}

.tutorial-section h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--color-accent);
  margin: 28px 0 12px;
}

.tutorial-section p {
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.75;
  font-size: 0.97rem;
}

.tutorial-section p strong {
  color: var(--color-text);
}

/* Lista */
.tutorial-section ul,
.tutorial-section ol {
  padding-left: 20px;
  margin-bottom: 16px;
}

.tutorial-section li {
  color: var(--color-text-muted);
  margin-bottom: 8px;
  line-height: 1.65;
  font-size: 0.95rem;
}

/* === BLOQUES DE CÓDIGO === */
.code-block {
  position: relative;
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(0, 180, 255, 0.15);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 18px;
  background: rgba(4, 14, 30, 0.9);
  border-bottom: 1px solid rgba(0, 180, 255, 0.1);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.code-dots span:nth-child(1) { background: #ff5f57; }
.code-dots span:nth-child(2) { background: #ffbd2e; }
.code-dots span:nth-child(3) { background: #28ca41; }

.code-lang {
  font-size: 0.75rem;
  color: var(--color-accent);
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
}

.code-copy {
  background: rgba(0, 180, 255, 0.1);
  border: 1px solid rgba(0, 180, 255, 0.2);
  color: var(--color-accent);
  font-size: 0.78rem;
  padding: 4px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-family: var(--font-main);
  transition: var(--transition);
}

.code-copy:hover {
  background: rgba(0, 180, 255, 0.2);
}

.code-copy.copied { color: #00d264; border-color: rgba(0, 210, 100, 0.3); }

pre {
  margin: 0;
  padding: 24px;
  background: #020c1a;
  overflow-x: auto;
  line-height: 1.7;
}

pre code {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #c9d1d9;
}

/* Colores básicos de sintaxis (manual) */
.kw { color: #ff7b72; }        /* keywords */
.fn { color: #d2a8ff; }        /* functions */
.st { color: #a5d6ff; }        /* strings */
.cm { color: #8b949e; font-style: italic; } /* comments */
.nm { color: #79c0ff; }        /* numbers */
.cl { color: #ffa657; }        /* class names */
.op { color: #ff7b72; }        /* operators */
.bl { color: #56d364; }        /* boolean */
.at { color: #e3b341; }        /* attributes/variables */

/* === CALLOUTS === */
.callout {
  display: flex;
  gap: 14px;
  padding: 18px 20px;
  border-radius: var(--radius-sm);
  margin: 20px 0;
  border-left: 3px solid;
}

.callout-info {
  background: rgba(0, 180, 255, 0.06);
  border-color: var(--color-accent);
}

.callout-tip {
  background: rgba(0, 210, 100, 0.06);
  border-color: #00d264;
}

.callout-warning {
  background: rgba(255, 160, 0, 0.06);
  border-color: #ffa000;
}

.callout-icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }
.callout-body { flex: 1; }
.callout-title { font-size: 0.85rem; font-weight: 700; margin-bottom: 4px; }
.callout-info .callout-title { color: var(--color-accent); }
.callout-tip .callout-title { color: #00d264; }
.callout-warning .callout-title { color: #ffa000; }
.callout-body p { font-size: 0.9rem; margin: 0; color: var(--color-text-muted); }

/* === EJERCICIOS === */
.exercise-card {
  background: rgba(4, 14, 30, 0.6);
  border: 1px solid rgba(0, 180, 255, 0.15);
  border-radius: var(--radius);
  margin: 20px 0;
  overflow: hidden;
}

.exercise-header {
  padding: 16px 20px;
  background: rgba(0, 180, 255, 0.05);
  border-bottom: 1px solid rgba(0, 180, 255, 0.1);
  display: flex;
  align-items: center;
  gap: 12px;
}

.exercise-num {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 50px;
  background: rgba(0, 180, 255, 0.15);
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

.exercise-title-text {
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--color-text);
}

.exercise-body { padding: 20px; }
.exercise-body p { font-size: 0.92rem; color: var(--color-text-muted); margin-bottom: 12px; }

.solved-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: rgba(0, 180, 255, 0.08);
  border: 1px solid rgba(0, 180, 255, 0.2);
  border-radius: 8px;
  color: var(--color-accent);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-main);
  margin-top: 8px;
}

.solved-toggle:hover {
  background: rgba(0, 180, 255, 0.15);
}

.solved-solution {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px dashed rgba(0, 180, 255, 0.15);
}

.solved-solution.visible { display: block; }

/* Propuesto */
.proposed-card {
  background: rgba(123, 47, 255, 0.05);
  border: 1px solid rgba(123, 47, 255, 0.2);
  border-radius: var(--radius);
  margin: 20px 0;
  overflow: hidden;
}

.proposed-header {
  padding: 14px 20px;
  background: rgba(123, 47, 255, 0.08);
  border-bottom: 1px solid rgba(123, 47, 255, 0.15);
  display: flex;
  align-items: center;
  gap: 10px;
}

.proposed-num {
  font-size: 0.72rem;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 50px;
  background: rgba(123, 47, 255, 0.2);
  color: #a878ff;
  letter-spacing: 0.05em;
}

.proposed-title-text { font-weight: 600; font-size: 0.95rem; color: var(--color-text); }
.proposed-body { padding: 20px; }
.proposed-body p { font-size: 0.92rem; color: var(--color-text-muted); margin-bottom: 10px; }
.proposed-body ul { color: var(--color-text-muted); font-size: 0.9rem; }

/* Explicación paso a paso */
.step-list { list-style: none; padding: 0; margin: 16px 0; }
.step-list li {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin-bottom: 16px;
  font-size: 0.9rem;
  color: var(--color-text-muted);
}
.step-num {
  flex-shrink: 0;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-accent2), var(--color-accent));
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 1px;
}
.step-text strong { color: var(--color-text); }

/* Inline code */
code {
  font-family: var(--font-mono);
  font-size: 0.88em;
  background: rgba(0, 180, 255, 0.1);
  color: var(--color-accent);
  padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid rgba(0, 180, 255, 0.15);
}

pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: inherit;
  font-size: inherit;
}

/* === PROGRESS BAR === */
.reading-progress {
  position: fixed;
  top: 70px;
  left: 0;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent2), var(--color-neon));
  z-index: 999;
  transition: width 0.1s linear;
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .tutorial-layout {
    grid-template-columns: 220px 1fr;
  }

  .tutorial-content {
    padding: 40px 36px;
  }
}

@media (max-width: 768px) {
  .navbar {
    padding: 0 20px;
  }

  .navbar-links {
    display: none;
  }

  .navbar-hamburger {
    display: flex;
  }

  .cards-grid {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    padding: 0 20px 60px;
    gap: 16px;
  }

  .tutorial-layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: fixed;
    left: -280px;
    top: 70px;
    width: 280px;
    height: calc(100vh - 70px);
    z-index: 900;
    transition: left var(--transition);
    border-right: 1px solid var(--color-border);
  }

  .sidebar.open {
    left: 0;
  }

  .sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    top: 70px;
    background: rgba(0,0,0,0.5);
    z-index: 899;
    backdrop-filter: blur(2px);
  }

  .sidebar-overlay.visible { display: block; }

  .tutorial-content {
    padding: 32px 20px;
  }

  .mobile-sidebar-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 12px 20px;
    background: var(--color-accent2);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 4px 20px rgba(0, 100, 255, 0.4);
    z-index: 800;
    font-family: var(--font-main);
    transition: var(--transition);
  }

  .mobile-sidebar-btn:hover {
    background: var(--color-accent);
    transform: translateY(-2px);
  }
}

@media (max-width: 480px) {
  .hero { padding: 60px 20px 40px; }
  .cards-grid { grid-template-columns: 1fr 1fr; gap: 14px; padding: 0 16px 48px; }
  .card { padding: 20px 16px; }
  .card-icon { width: 48px; height: 48px; font-size: 2rem; }
  .tutorial-content { padding: 24px 16px; }
}

@media (max-width: 360px) {
  .cards-grid { grid-template-columns: 1fr; }
}

/* === PORTAL BTN === */
.navbar-links a.portal-btn {
  color: var(--color-neon2);
  border: 1px solid rgba(123, 47, 255, 0.4);
  background: rgba(123, 47, 255, 0.08);
}
.navbar-links a.portal-btn:hover {
  background: rgba(123, 47, 255, 0.15);
  border-color: var(--color-neon2);
  box-shadow: 0 0 15px rgba(123, 47, 255, 0.3);
}

.mobile-menu a.portal-btn-mobile {
  color: var(--color-neon2);
  background: rgba(123, 47, 255, 0.08);
  border-left: 3px solid var(--color-neon2);
  margin-bottom: 8px;
}
.mobile-menu a.portal-btn-mobile:hover {
  background: rgba(123, 47, 255, 0.15);
}