/* ============================================================
   FEENIXDV — Design System & Global Styles
   Black/Dark theme for DevOps Training Website
   ============================================================ */

/* ── Design Tokens ─────────────────────────────────────────── */
:root {
  --black:         #000000;
  --dark:          #0a0a0a;
  --dark-2:        #111111;
  --dark-3:        #1a1a1a;
  --dark-4:        #222222;
  --surface:       #141414;
  --border:        #2a2a2a;
  --border-light:  #333333;

  --cyan:          #00d4ff;
  --cyan-dim:      rgba(0, 212, 255, 0.12);
  --cyan-glow:     rgba(0, 212, 255, 0.25);
  --purple:        #7b2fbe;
  --purple-dim:    rgba(123, 47, 190, 0.15);
  --green:         #00ff88;
  --green-dim:     rgba(0, 255, 136, 0.1);
  --orange:        #ff6b35;
  --red:           #ff3b3b;
  --yellow:        #ffd60a;

  --gradient:      linear-gradient(135deg, #00d4ff 0%, #7b2fbe 100%);
  --gradient-dark: linear-gradient(135deg, #0a0a0a 0%, #1a0a2e 100%);

  --white:         #ffffff;
  --text:          #e0e0e0;
  --text-muted:    #888888;
  --text-faint:    #444444;

  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;

  --fw-normal:    400;
  --fw-medium:    500;
  --fw-semibold:  600;
  --fw-bold:      700;
  --fw-black:     900;

  --radius-sm:   4px;
  --radius:      8px;
  --radius-md:   12px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  --shadow:    0 4px 24px rgba(0,0,0,0.6);
  --shadow-lg: 0 16px 64px rgba(0,0,0,0.8);
  --glow:      0 0 30px rgba(0,212,255,0.2);
  --glow-lg:   0 0 60px rgba(0,212,255,0.15);

  --ease:      cubic-bezier(0.4, 0, 0.2, 1);
  --duration:  0.25s;
}

/* ── Reset ──────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--text);
  background: var(--black);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img, video { max-width: 100%; height: auto; display: block; }
a { color: var(--cyan); text-decoration: none; transition: color var(--duration) var(--ease); }
a:hover { color: #66dfff; }
ul, ol { list-style: none; }

/* ── Typography ─────────────────────────────────────────────── */
h1, h2, h3, h4, h5 {
  font-weight: var(--fw-bold);
  color: var(--white);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
h1 { font-size: clamp(2.2rem, 5vw, var(--text-5xl)); }
h2 { font-size: clamp(1.75rem, 3.5vw, var(--text-4xl)); }
h3 { font-size: clamp(1.2rem, 2.5vw, var(--text-2xl)); }
p  { color: var(--text-muted); line-height: 1.7; }

.gradient-text {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ── Layout ─────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}
.section { padding-block: 6rem; }
.section--dark    { background: var(--dark); }
.section--surface { background: var(--surface); }
.section--black   { background: var(--black); }

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

/* ── Section Header ─────────────────────────────────────────── */
.section-header {
  text-align: center;
  margin-bottom: 4rem;
}
.section-header .eyebrow {
  display: inline-block;
  font-size: var(--text-sm);
  font-weight: var(--fw-black);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,0.35);
  border-radius: var(--radius-full);
  padding: 0.45rem 1.4rem;
  margin-bottom: 1.25rem;
  box-shadow: 0 0 16px rgba(0,212,255,0.15);
  text-shadow: 0 0 20px rgba(0,212,255,0.4);
}
.section-header h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4vw, var(--text-4xl));
  font-weight: var(--fw-black);
  letter-spacing: -0.025em;
}
.section-header p {
  font-size: var(--text-lg);
  max-width: 580px;
  margin-inline: auto;
  color: var(--text-muted);
}

/* ── Buttons ─────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2rem;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: all var(--duration) var(--ease);
  letter-spacing: 0.01em;
}
.btn svg { width: 1em; height: 1em; flex-shrink: 0; }

.btn-primary {
  background: var(--gradient);
  color: var(--white);
  box-shadow: 0 4px 20px var(--cyan-glow);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--cyan-glow);
  color: var(--white);
}

.btn-outline {
  background: transparent;
  color: var(--cyan);
  border-color: var(--cyan);
}
.btn-outline:hover {
  background: var(--cyan-dim);
  transform: translateY(-2px);
  color: var(--cyan);
}

.btn-ghost {
  background: transparent;
  color: var(--text-muted);
  border-color: var(--border-light);
}
.btn-ghost:hover { background: var(--dark-3); color: var(--white); }

.btn-lg { padding: 1rem 2.5rem; font-size: var(--text-base); border-radius: var(--radius-md); }
.btn-sm { padding: 0.5rem 1.25rem; font-size: var(--text-xs); }

/* ── Badge ───────────────────────────────────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 0.2rem 0.7rem;
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.badge-cyan    { background: var(--cyan-dim);   color: var(--cyan);   border: 1px solid rgba(0,212,255,0.3); }
.badge-green   { background: var(--green-dim);  color: var(--green);  border: 1px solid rgba(0,255,136,0.3); }
.badge-purple  { background: var(--purple-dim); color: #c084fc;       border: 1px solid rgba(123,47,190,0.4); }
.badge-orange  { background: rgba(255,107,53,.12); color: var(--orange); border: 1px solid rgba(255,107,53,0.3); }

/* ── Card ────────────────────────────────────────────────────── */
.card {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration) var(--ease);
  display: flex;
  flex-direction: column;
}
.card:hover {
  border-color: rgba(0,212,255,0.35);
  transform: translateY(-4px);
  box-shadow: var(--shadow), var(--glow);
}
.card-img {
  aspect-ratio: 16/9;
  background: var(--dark-3);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
}
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.card-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}
.card-title {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  color: var(--white);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.card-title a { color: inherit; }
.card-title a:hover { color: var(--cyan); }
.card-excerpt {
  font-size: var(--text-sm);
  color: var(--text-muted);
  flex: 1;
  margin-bottom: 1rem;
  line-height: 1.6;
}
.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: auto;
}

/* ── Reveal animation ────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================================
   HEADER
   ============================================================ */
#header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(0,0,0,0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: all var(--duration) var(--ease);
}
#header.scrolled {
  background: rgba(0,0,0,0.97);
  border-bottom-color: var(--border-light);
}
.header-inner {
  display: flex;
  align-items: center;
  height: 70px;
  gap: 2rem;
}
.logo {
  text-decoration: none;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  line-height: 1;
}
.logo-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}
.logo-main {
  font-size: 1.35rem;
  font-weight: var(--fw-black);
  letter-spacing: -0.02em;
  line-height: 1;
}
.logo-fdx {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-academy { color: var(--white); }
.logo-tagline {
  font-size: 0.6rem;
  font-weight: var(--fw-semibold);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  line-height: 1;
}

nav { flex: 1; display: flex; justify-content: center; }
.nav-list {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.nav-link {
  padding: 0.5rem 0.875rem;
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease);
  text-decoration: none;
}
.nav-link:hover, .nav-link.active { color: var(--white); background: rgba(255,255,255,0.06); }
.nav-link.active { color: var(--cyan); }

.header-actions { display: flex; align-items: center; gap: 0.75rem; flex-shrink: 0; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem;
  cursor: pointer;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
}
.hamburger span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--text-muted);
  border-radius: 2px;
  transition: all var(--duration) var(--ease);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile nav */
.mobile-nav {
  position: fixed;
  top: 70px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--black);
  padding: 2rem 1.5rem;
  transform: translateX(100%);
  transition: transform 0.35s var(--ease);
  border-top: 1px solid var(--border);
  overflow-y: auto;
  z-index: 999;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav .nav-link {
  display: block;
  padding: 1rem 0;
  font-size: var(--text-lg);
  border-bottom: 1px solid var(--border);
  border-radius: 0;
}
.mobile-nav .nav-link:last-of-type { border-bottom: none; }
.mobile-nav .btn { margin-top: 1.5rem; width: 100%; justify-content: center; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  background: var(--black);
  position: relative;
  overflow: hidden;
  padding-top: 70px;
}

/* Animated grid background */
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0,212,255,0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 40%, transparent 100%);
}

/* Glow orbs */
.hero-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
}
.hero-orb-1 {
  width: 600px; height: 600px;
  background: rgba(0,212,255,0.07);
  top: -100px; left: -100px;
}
.hero-orb-2 {
  width: 500px; height: 500px;
  background: rgba(123,47,190,0.09);
  bottom: -100px; right: -100px;
}

.hero-inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  padding-block: 5rem;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--cyan);
  background: var(--cyan-dim);
  border: 1px solid rgba(0,212,255,0.25);
  border-radius: var(--radius-full);
  padding: 0.35rem 1rem;
  margin-bottom: 1.5rem;
}
.hero-eyebrow .dot {
  width: 6px; height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--cyan);
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse { 0%,100%{opacity:1;} 50%{opacity:0.3;} }

.hero-title {
  font-size: clamp(2.5rem, 5.5vw, 4rem);
  font-weight: var(--fw-black);
  line-height: 1.05;
  margin-bottom: 1.5rem;
  letter-spacing: -0.03em;
}

.typed-wrapper {
  display: block;
  min-height: 1.1em;
}
.typed {
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.typed::after {
  content: '|';
  -webkit-text-fill-color: var(--cyan);
  animation: blink 1s step-end infinite;
  margin-left: 2px;
}
@keyframes blink { 0%,100%{opacity:1;} 50%{opacity:0;} }

.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 480px;
}

.hero-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-bottom: 3rem; }

.hero-stats {
  display: flex;
  gap: 2.5rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.stat-number {
  font-size: var(--text-2xl);
  font-weight: var(--fw-black);
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 0.25rem;
}
.stat-label { font-size: var(--text-xs); color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.08em; }

/* Terminal */
.terminal {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg), var(--glow);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
}
.terminal-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--dark-3);
  border-bottom: 1px solid var(--border);
}
.t-dot { width: 12px; height: 12px; border-radius: 50%; }
.t-dot:nth-child(1){background:#ff5f57;}
.t-dot:nth-child(2){background:#ffbd2e;}
.t-dot:nth-child(3){background:#28ca41;}
.t-title {
  flex: 1;
  text-align: center;
  font-size: var(--text-xs);
  color: var(--text-faint);
}
.terminal-body { padding: 1.5rem; line-height: 2; }
.t-line { display: flex; gap: 0.5rem; align-items: flex-start; }
.t-prompt { color: var(--green); user-select: none; flex-shrink: 0; }
.t-cmd    { color: var(--cyan); }
.t-arg    { color: #79c0ff; }
.t-flag   { color: #ffa657; }
.t-out    { color: var(--text-muted); padding-left: 1.25rem; }
.t-ok     { color: var(--green); padding-left: 1.25rem; }
.t-comment{ color: var(--text-faint); font-style: italic; }

.float-badge {
  position: absolute;
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 0.6rem 1rem;
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  color: var(--white);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  box-shadow: var(--shadow);
  animation: float 3s ease-in-out infinite;
  white-space: nowrap;
}
.float-badge-tl { top: -1rem; left: -1.5rem; animation-delay: 0s; }
.float-badge-br { bottom: -1rem; right: -1.5rem; animation-delay: 1.5s; }
@keyframes float { 0%,100%{transform:translateY(0);} 50%{transform:translateY(-8px);} }

.hero-visual { position: relative; }

/* ============================================================
   TECH STRIP
   ============================================================ */
.tech-strip-section {
  padding-block: 3rem;
  background: var(--dark);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.tech-strip-label {
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--fw-black);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--white);
  margin-bottom: 2rem;
  background: var(--gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.tech-strip {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 2.5rem;
}
.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.65rem;
  opacity: 0.75;
  transition: all var(--duration) var(--ease);
  cursor: default;
}
.tech-item:hover { opacity: 1; transform: translateY(-4px); }
.tech-icon {
  width: 68px;
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.6rem;
  background: var(--dark-3);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 16px rgba(0,0,0,0.4);
  transition: all var(--duration) var(--ease);
}
.tech-item:hover .tech-icon {
  border-color: rgba(0,212,255,0.45);
  box-shadow: 0 0 20px rgba(0,212,255,0.2);
  background: rgba(0,212,255,0.06);
}
.tech-name {
  font-size: var(--text-sm);
  color: var(--white);
  font-weight: var(--fw-bold);
  letter-spacing: 0.02em;
}

/* ============================================================
   COURSES
   ============================================================ */
/* ── Level filter tabs ──────────────────────────────────────── */
.level-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}
.level-btn {
  padding: 0.5rem 1.25rem;
  border-radius: 2rem;
  border: 1px solid var(--border);
  background: var(--dark-3);
  color: var(--text-muted);
  font-size: var(--text-sm);
  font-weight: var(--fw-medium);
  cursor: pointer;
  transition: all 0.2s ease;
}
.level-btn:hover {
  border-color: rgba(0,212,255,0.4);
  color: var(--white);
}
.level-btn.active {
  background: rgba(0,212,255,0.12);
  border-color: var(--cyan);
  color: var(--cyan);
  font-weight: var(--fw-semibold);
}
.course-card.hidden { display: none; }

.courses-grid { display: grid; grid-template-columns: repeat(3, 1fr); column-gap: 2rem; row-gap: 3rem; }
.course-card {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration) var(--ease);
  display: flex;
  flex-direction: column;
}
.course-card:hover {
  border-color: rgba(0,212,255,0.4);
  transform: translateY(-5px);
  box-shadow: var(--shadow), var(--glow);
}
.course-thumb {
  aspect-ratio: 16/9;
  background: var(--dark-3);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.course-thumb-icon {
  font-size: 3.5rem;
  filter: drop-shadow(0 0 20px rgba(0,212,255,0.3));
}
.course-thumb-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, transparent 50%, rgba(0,0,0,0.6));
}
.course-badge-wrap {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  display: flex;
  gap: 0.4rem;
}
.course-body { padding: 1.5rem; flex: 1; display: flex; flex-direction: column; }
.course-meta {
  display: flex;
  gap: 1rem;
  margin-bottom: 0.75rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
}
.course-meta span { display: flex; align-items: center; gap: 0.3rem; }
.course-title {
  font-size: var(--text-xl);
  font-weight: var(--fw-bold);
  color: var(--white);
  margin-bottom: 0.75rem;
  line-height: 1.3;
}
.course-desc { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.6; flex: 1; margin-bottom: 1.25rem; }
.course-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}
.course-price {
  font-size: var(--text-xl);
  font-weight: var(--fw-black);
  color: var(--white);
}
.course-price .free  { color: var(--green); }
.course-price .demo-label { font-size: .75rem; font-weight: 400; color: var(--cyan); opacity: .8; }
.course-students { font-size: var(--text-xs); color: var(--text-muted); }

/* ============================================================
   ABOUT — Catalog layout
   ============================================================ */
.about-lead {
  max-width: 680px;
  margin-inline: auto;
  font-size: var(--text-lg);
  color: var(--text-muted);
  line-height: 1.75;
}

/* ── Main catalog grid: stats | offers ───────────────────── */
.catalog-grid {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 1.5rem;
  margin: 3rem 0 3rem;
  align-items: start;
}

/* ── Left: stats column ──────────────────────────────────── */
.catalog-stats {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 1.75rem 1.5rem;
  position: sticky;
  top: 90px;
}
.catalog-label {
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--cyan);
  margin-bottom: 1.5rem;
}
.cstat { padding: 0.75rem 0; }
.cstat-num {
  font-size: var(--text-3xl);
  font-weight: var(--fw-black);
  color: var(--white);
  line-height: 1;
  margin-bottom: 0.3rem;
}
.cstat-star { color: #facc15; font-size: 1.1rem; }
.cstat-text {
  font-size: var(--text-xs);
  color: var(--text-muted);
  line-height: 1.4;
}
.cstat-divider {
  height: 1px;
  background: var(--border);
  margin: 0.25rem 0;
}

/* ── Right: offer cards ──────────────────────────────────── */
.catalog-offers {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.offer-card {
  display: flex;
  gap: 1.25rem;
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  transition: all var(--duration) var(--ease);
}
.offer-card:hover {
  border-color: rgba(0,212,255,0.3);
  transform: translateX(4px);
  box-shadow: var(--shadow), var(--glow);
}
.offer-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.offer-icon-wrap--cyan   { background: rgba(0,212,255,0.12);  border: 1px solid rgba(0,212,255,0.25); }
.offer-icon-wrap--purple { background: rgba(99,102,241,0.12); border: 1px solid rgba(99,102,241,0.25); }
.offer-icon-wrap--green  { background: rgba(16,185,129,0.12); border: 1px solid rgba(16,185,129,0.25); }

.offer-body { flex: 1; min-width: 0; }
.offer-title {
  font-size: var(--text-lg);
  font-weight: var(--fw-bold);
  color: var(--white);
  margin-bottom: 0.5rem;
  line-height: 1.3;
}
.offer-desc {
  font-size: var(--text-sm);
  color: var(--text-muted);
  line-height: 1.7;
  margin-bottom: 0.875rem;
}
.offer-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}
.offer-points li {
  font-size: var(--text-xs);
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.offer-points li::before {
  content: '';
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  flex-shrink: 0;
  box-shadow: 0 0 5px var(--cyan);
}

/* ── Tech catalog ────────────────────────────────────────── */
.tech-catalog {
  border-top: 1px solid var(--border);
  padding-top: 2.5rem;
  text-align: center;
}
.tech-catalog-label {
  font-size: var(--text-base);
  font-weight: var(--fw-black);
  text-transform: uppercase;
  letter-spacing: .18em;
  color: var(--white);
  margin-bottom: 1.5rem;
  text-shadow: 0 0 20px rgba(0,212,255,0.3);
}
.tech-catalog-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  justify-content: center;
  margin-bottom: 2.5rem;
}
.tech-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: 2rem;
  font-size: var(--text-sm);
  color: var(--text-muted);
  transition: all 0.2s ease;
}
.tech-chip:hover {
  border-color: rgba(0,212,255,0.4);
  color: var(--white);
  background: rgba(0,212,255,0.06);
}

/* ── Skills grid (kept for other uses) ───────────────────── */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  margin: 0 auto 2.5rem;
  max-width: 860px;
}
.skills-grid--centered { justify-items: center; }
.skill-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-sm);
  color: var(--text-muted);
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 0.875rem;
  white-space: nowrap;
}
.skill-item::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--cyan);
  border-radius: 50%;
  flex-shrink: 0;
  box-shadow: 0 0 6px var(--cyan);
}
.about-cta {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}
.about-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ============================================================
   BLOG SECTION
   ============================================================ */
.blog-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }

/* ============================================================
   YOUTUBE SECTION
   ============================================================ */
.yt-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.yt-card {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration) var(--ease);
}
.yt-card:hover { border-color: rgba(255,0,0,0.4); transform: translateY(-4px); box-shadow: var(--shadow), 0 0 30px rgba(255,0,0,0.1); }
.yt-thumb {
  aspect-ratio: 16/9;
  background: var(--dark-3);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  overflow: hidden;
}
.yt-thumb img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.yt-play-btn {
  position: relative;
  z-index: 1;
  width: 64px;
  height: 44px;
  background: #ff0000;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--duration) var(--ease);
}
.yt-thumb:hover .yt-play-btn { transform: scale(1.1); }
.yt-play-btn svg { width: 20px; height: 20px; fill: white; }
.yt-body { padding: 1rem 1.25rem; }
.yt-title { font-size: var(--text-base); font-weight: var(--fw-semibold); color: var(--white); line-height: 1.4; }
.yt-title a { color: inherit; }
.yt-title a:hover { color: #ff4444; }

/* ============================================================
   TESTIMONIALS
   ============================================================ */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; }
.testimonial-card {
  background: var(--dark-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  position: relative;
  transition: all var(--duration) var(--ease);
}
.testimonial-card:hover { border-color: rgba(0,212,255,0.3); transform: translateY(-3px); }
.testimonial-card::before {
  content: '\201C';
  position: absolute;
  top: 1.25rem;
  right: 1.5rem;
  font-size: 5rem;
  line-height: 1;
  color: rgba(0,212,255,0.08);
  font-family: Georgia, serif;
}
.stars { display: flex; gap: 3px; margin-bottom: 1rem; }
.stars svg { width: 16px; height: 16px; }
.testimonial-text { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.7; font-style: italic; margin-bottom: 1.25rem; }
.testimonial-author { display: flex; align-items: center; gap: 0.75rem; padding-top: 1.25rem; border-top: 1px solid var(--border); }
.author-avatar {
  width: 44px; height: 44px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--fw-bold);
  font-size: var(--text-sm);
  color: var(--black);
  flex-shrink: 0;
}
.author-name { font-size: var(--text-sm); font-weight: var(--fw-semibold); color: var(--white); }
.author-role { font-size: var(--text-xs); color: var(--text-muted); }

/* ============================================================
   NEWSLETTER
   ============================================================ */
.newsletter-box {
  background: linear-gradient(135deg, var(--dark-2) 0%, rgba(0,212,255,0.04) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 4rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.newsletter-box::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 50%;
  height: 1px;
  background: var(--gradient);
}
.newsletter-box h2 { margin-bottom: 1rem; }
.newsletter-box p  { margin-bottom: 2rem; max-width: 500px; margin-inline: auto; }
.newsletter-form {
  display: flex;
  gap: 0.75rem;
  max-width: 480px;
  margin-inline: auto;
}
.newsletter-input {
  flex: 1;
  padding: 0.875rem 1.25rem;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.25);
  border-radius: var(--radius);
  color: var(--white);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  outline: none;
  transition: border-color var(--duration) var(--ease);
}
.newsletter-input:focus { border-color: var(--cyan); box-shadow: 0 0 0 3px rgba(0,212,255,0.15); }
.newsletter-input::placeholder { color: rgba(255,255,255,0.5); font-style: italic; }

/* ============================================================
   WHATSAPP FLOAT
   ============================================================ */
.whatsapp-float {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: #25d366;
  color: white;
  padding: 0.8rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: var(--fw-semibold);
  box-shadow: 0 4px 20px rgba(37,211,102,0.45);
  transition: all var(--duration) var(--ease);
  text-decoration: none;
}
.whatsapp-float:hover { background: #20b958; transform: translateY(-3px); color: white; box-shadow: 0 8px 32px rgba(37,211,102,0.55); }
.whatsapp-float svg { width: 22px; height: 22px; flex-shrink: 0; }

/* ============================================================
   FOOTER
   ============================================================ */
footer {
  background: var(--dark);
  border-top: 1px solid var(--border);
}
.footer-top { padding: 5rem 0 3rem; }
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 3rem;
}
.footer-brand-logo {
  text-decoration: none;
  display: inline-block;
  margin-bottom: 1.25rem;
  line-height: 1;
}
.footer-logo-img {
  height: 64px;
  width: auto;
  border-radius: 12px;
  display: block;
}
.footer-tagline { font-size: var(--text-sm); color: var(--text-muted); line-height: 1.7; margin-bottom: 1.5rem; max-width: 260px; }
.footer-socials { display: flex; gap: 0.75rem; }
.social-link {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-muted);
  transition: all var(--duration) var(--ease);
}
.social-link:hover { background: var(--cyan-dim); color: var(--cyan); border-color: rgba(0,212,255,0.4); transform: translateY(-2px); }
.social-link svg { width: 16px; height: 16px; }

.footer-col-title {
  font-size: var(--text-xs);
  font-weight: var(--fw-semibold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--white);
  margin-bottom: 1.25rem;
}
.footer-links { display: flex; flex-direction: column; gap: 0.75rem; }
.footer-links a { font-size: var(--text-sm); color: var(--text-muted); transition: all var(--duration) var(--ease); }
.footer-links a:hover { color: var(--cyan); padding-left: 4px; }

.footer-newsletter-text { font-size: var(--text-sm); color: var(--text-muted); margin-bottom: 1rem; }
.footer-form { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-input {
  padding: 0.7rem 1rem;
  background: var(--dark-3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  outline: none;
  transition: border-color var(--duration) var(--ease);
}
.footer-input:focus { border-color: var(--cyan); }
.footer-input::placeholder { color: var(--text-faint); }

.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 1.75rem 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}
.footer-copyright { font-size: var(--text-sm); color: var(--text-faint); }
.footer-legal { display: flex; gap: 1.5rem; }
.footer-legal a { font-size: var(--text-sm); color: var(--text-faint); }
.footer-legal a:hover { color: var(--text-muted); }

/* ============================================================
   RESPONSIVE
   ============================================================ */

/* ── Tablet landscape / small desktop  (max 1024px) ────────── */
@media (max-width: 1024px) {
  .hero-inner        { grid-template-columns: 1fr; text-align: center; gap: 3rem; }
  .hero-subtitle     { max-width: 100%; margin-inline: auto; }
  .hero-actions      { justify-content: center; }
  .hero-stats        { justify-content: center; }
  .hero-visual       { max-width: 500px; margin-inline: auto; }
  .float-badge       { display: none; }
  .courses-grid      { grid-template-columns: repeat(2, 1fr); }
  .catalog-grid      { grid-template-columns: 1fr; }
  .catalog-stats     { position: static; display: grid; grid-template-columns: repeat(2,1fr); gap: 0; }
  .catalog-label     { grid-column: 1/-1; }
  .cstat-divider     { display: none; }
  .offer-card        { flex-direction: column; }
  .skills-grid       { grid-template-columns: repeat(2, 1fr); }
  .blog-grid         { grid-template-columns: repeat(2, 1fr); }
  .yt-grid           { grid-template-columns: repeat(2, 1fr); }
  .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid       { grid-template-columns: 1fr 1fr; gap: 2rem; }
  .hamburger         { display: flex; }
  nav                { display: none; }
  .header-actions .btn { display: none; }
}

/* ── Tablet portrait (max 768px) ────────────────────────────── */
@media (max-width: 768px) {
  /* Section headers */
  .section-header h2  { font-size: clamp(1.5rem, 5vw, 2.25rem); }
  .section-header p   { font-size: var(--text-sm); }

  /* Hero */
  .hero-visual        { max-width: 380px; }

  /* Tech strip — wrap icons neatly */
  .tech-strip         { gap: 1.5rem; }
  .tech-icon          { width: 56px; height: 56px; font-size: 2rem; }

  /* Skills */
  .skills-grid        { grid-template-columns: repeat(2, 1fr); max-width: 100%; }

  /* Catalog stats: single row of 2 */
  .catalog-stats      { grid-template-columns: repeat(2, 1fr); }

  /* Blog & testimonials: 1 col on tablet portrait */
  .blog-grid          { grid-template-columns: 1fr; }
  .testimonials-grid  { grid-template-columns: 1fr; }

  /* YouTube: 1 col */
  .yt-grid            { grid-template-columns: 1fr; }

  /* Footer: single column */
  .footer-grid        { grid-template-columns: 1fr; gap: 2rem; }
  .footer-tagline     { max-width: 100%; }

  /* Announcement popup: tighter padding */
  .announcement-box   { padding: 2rem 1.5rem 1.5rem; }
}

/* ── Phone (max 640px) ──────────────────────────────────────── */
@media (max-width: 640px) {
  .section            { padding-block: 4rem; }
  .courses-grid       { grid-template-columns: 1fr; }
  .blog-grid          { grid-template-columns: 1fr; }
  .yt-grid            { grid-template-columns: 1fr; }
  .testimonials-grid  { grid-template-columns: 1fr; }
  .footer-grid        { grid-template-columns: 1fr; }
  .newsletter-form    { flex-direction: column; }
  .newsletter-box     { padding: 2.5rem 1.5rem; }
  .footer-bottom      { flex-direction: column; text-align: center; }
  .hero-stats         { gap: 1.5rem; }
  .whatsapp-float span { display: none; }
  .whatsapp-float     { padding: 1rem; border-radius: 50%; width: 56px; height: 56px; }

  /* Skills: 1 col on small phones */
  .skills-grid        { grid-template-columns: 1fr; }

  /* Tech strip: smaller icons on phones */
  .tech-strip         { gap: 1rem; }
  .tech-icon          { width: 48px; height: 48px; font-size: 1.65rem; }
  .tech-name          { font-size: 0.7rem; }

  /* Offer cards: tighter padding */
  .offer-card         { padding: 1.25rem; }

  /* Announcement popup: full width stacked buttons */
  .announcement-box        { padding: 2rem 1.25rem 1.5rem; }
  .announcement-actions    { flex-direction: column; }
  .announcement-actions .btn { width: 100%; text-align: center; }
}

/* ── Very small phones (max 400px) ─────────────────────────── */
@media (max-width: 400px) {
  .hero-stats         { flex-direction: column; gap: 1rem; align-items: center; }
  .level-filter       { gap: 0.4rem; }
  .level-btn          { font-size: 0.7rem; padding: 0.4rem 0.85rem; }
  .tech-strip         { gap: 0.75rem; }
  .tech-icon          { width: 44px; height: 44px; font-size: 1.5rem; }
  .footer-legal       { flex-direction: column; gap: 0.5rem; text-align: center; }
}


/* Price Discount Styling */
.price-strikethrough {
  text-decoration: line-through;
  color: var(--text-faint);
  font-size: 0.6em;
  margin-right: 0.5rem;
  font-weight: normal;
  opacity: 0.7;
}
.price-discount {
  color: #ff4d4f;
  font-size: 0.45em;
  vertical-align: super;
  font-weight: bold;
  margin-left: 0.3rem;
  padding: 0.2rem 0.4rem;
  background: rgba(255, 77, 79, 0.1);
  border: 1px solid rgba(255, 77, 79, 0.2);
  border-radius: var(--radius-sm);
  letter-spacing: 0.5px;
  animation: pulseDiscount 2s infinite;
}
@keyframes pulseDiscount {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}
/* Trust Bar / Feature Bar */
.trust-bar-section {
  position: relative;
  z-index: 10;
  margin-top: -3rem; /* overlap with hero bottom */
  padding: 0 1.5rem;
}

.trust-bar {
  max-width: 1200px;
  margin: 0 auto;
  background: rgba(15, 23, 42, 0.98); backdrop-filter: blur(12px); /* extremely light purple, almost white */
  
  border-radius: 12px;
  padding: 1.5rem 2rem;
  box-shadow: none;
  border: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1.5rem;
}

.trust-bar-item {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.trust-bar-title {
  color: #f8fafc;
  font-weight: 700;
  font-size: 1.15rem;
  margin-bottom: 0.25rem;
}

.trust-bar-desc {
  color: #94a3b8;
  font-size: 0.95rem;
  line-height: 1.4;
}

.trust-bar-divider {
  width: 1px;
  height: 50px;
  background: rgba(255,255,255,0.1);
}

@media (max-width: 900px) {
  .trust-bar {
    flex-wrap: wrap;
    padding: 1.5rem;
  }
  .trust-bar-item {
    min-width: calc(50% - 2rem);
    margin-bottom: 1rem;
  }
  .trust-bar-divider {
    display: none;
  }
}
@media (max-width: 500px) {
  .trust-bar-item {
    min-width: 100%;
  }
}

.trust-bar-wrapper {
  position: relative;
  border-radius: 13px;
  padding: 2px;
  overflow: hidden;
  max-width: 1200px;
  margin: 0 auto;
  box-shadow: none;
}

.trust-bar-wrapper::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: conic-gradient(
    transparent, 
    transparent, 
    transparent, 
    #b862d2, 
    #00ff88, 
    transparent 20%
  );
  animation: borderSpin 4s linear infinite;
  z-index: -1;
}

@keyframes borderSpin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}