E-Learning Platform — Meridian

/* ── Demo 52: E-Learning Platform — Meridian ── */
/* Design: Fresh indigo/violet on white — educational, approachable, modern */
/* Fonts: Outfit (geometric sans) + JetBrains Mono (code/data) */

:root {
  --bg: #fafbff;
  --white: #ffffff;
  --surface: #f3f4ff;
  --border: #e4e6f8;
  --text: #111230;
  --muted: #6b6e8a;
  --indigo: #4f46e5;
  --indigo-light: #818cf8;
  --indigo-dim: rgba(79, 70, 229, 0.08);
  --violet: #7c3aed;
  --green: #059669;
  --amber: #d97706;
  --red: #dc2626;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Outfit", -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ── Section tag ── */
.section-tag {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--indigo);
  margin-bottom: 0.75rem;
}

/* ── Buttons ── */
.btn-primary {
  display: inline-block;
  padding: 0.8rem 1.75rem;
  background: var(--indigo);
  color: white;
  font-family: "Outfit", sans-serif;
  font-size: 0.88rem;
  font-weight: 600;
  border-radius: 6px;
  text-decoration: none;
  transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 2px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
  background: var(--violet);
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(79, 70, 229, 0.4);
}

.btn-primary--lg {
  padding: 1rem 2.25rem;
  font-size: 1rem;
}

.btn-text {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.btn-text:hover {
  color: var(--text);
}

.btn-ghost {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--indigo);
  text-decoration: none;
  transition: gap 0.2s;
}

.btn-ghost:hover {
  text-decoration: underline;
}

.btn-outline-dark {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  font-size: 0.88rem;
  font-weight: 500;
  border-radius: 6px;
  text-decoration: none;
  transition: border-color 0.2s, background 0.2s;
}

.btn-outline-dark:hover {
  border-color: var(--indigo);
  background: var(--indigo-dim);
}

/* ── Nav ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 3rem;
  background: rgba(250, 251, 255, 0.9);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text);
}

.logo-mark {
  width: 24px;
  height: 24px;
  background: var(--indigo);
  border-radius: 6px;
  position: relative;
}

.logo-mark::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 16px;
  height: 16px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 3px;
}

.nav-links {
  display: flex;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--text);
}

.nav-ctas {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* ── Hero ── */
.hero {
  padding: 7rem 3rem 5rem;
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
  margin-bottom: 1.5rem;
}

.hb-dot {
  width: 7px;
  height: 7px;
  background: var(--green);
  border-radius: 50%;
  animation: pulse-green 2s ease-in-out infinite;
}

@keyframes pulse-green {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.hero-h1 {
  font-size: clamp(2.5rem, 5vw, 4rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: 1.25rem;
}

.h1-highlight {
  background: linear-gradient(90deg, var(--indigo), var(--violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-p {
  font-size: 1.05rem;
  color: var(--muted);
  line-height: 1.8;
  margin-bottom: 2rem;
  max-width: 460px;
}

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

.hero-stats {
  display: flex;
  gap: 2rem;
  align-items: center;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}

.hs-item {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.hs-num {
  font-family: "JetBrains Mono", monospace;
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1;
}

.hs-label {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 500;
}

.hs-div {
  width: 1px;
  height: 36px;
  background: var(--border);
}

/* ── Progress card (hero visual) ── */
.hero-visual {
  position: relative;
}

.progress-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  box-shadow: 0 8px 40px rgba(79, 70, 229, 0.1);
  position: relative;
  z-index: 2;
}

.pc-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.pc-avatar {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--indigo), var(--violet));
  flex-shrink: 0;
}

.pc-meta {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.pc-meta strong {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
}

.pc-meta span {
  font-size: 0.72rem;
  color: var(--muted);
}

.pc-pct {
  font-family: "JetBrains Mono", monospace;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--indigo);
}

.pc-progress {
  height: 6px;
  background: var(--surface);
  border-radius: 3px;
  overflow: hidden;
  margin-bottom: 1.25rem;
}

.pc-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--indigo), var(--indigo-light));
  border-radius: 3px;
  transition: width 0.1s linear;
}

.pc-lessons {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.pc-lesson {
  font-size: 0.82rem;
  color: var(--muted);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  transition: background 0.2s;
}

.pc-lesson--done {
  color: var(--green);
  background: rgba(5, 150, 105, 0.06);
}

.pc-lesson--active {
  color: var(--indigo);
  background: var(--indigo-dim);
  font-weight: 600;
}

/* Floating skill badges */
.skill-badge {
  position: absolute;
  padding: 0.4rem 0.9rem;
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
  white-space: nowrap;
}

.sb--1 {
  top: -1.5rem;
  right: 1.5rem;
}
.sb--2 {
  bottom: 1.5rem;
  right: -1.5rem;
}
.sb--3 {
  bottom: -1.5rem;
  left: 1rem;
}
.sb--4 {
  top: 2rem;
  left: -1.5rem;
}

/* ── Skills section ── */
.skills-section {
  padding: 6rem 3rem;
  background: var(--text);
  color: white;
}

.skills-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
}

.skills-inner .section-tag {
  color: var(--indigo-light);
}

.skills-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.skills-header p {
  font-size: 0.95rem;
  color: rgba(255, 255, 255, 0.55);
  line-height: 1.8;
}

.skill-tree {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(6, 56px);
  gap: 0;
  min-height: 400px;
}

#tree-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.st-node {
  position: absolute;
  width: 100px;
  padding: 0.45rem 0.8rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.05);
  text-align: center;
  transform: translate(calc((var(--col) - 1) * 110px + 10px), calc((var(--row) - 1) * 60px));
  transition: all 0.3s ease;
  cursor: default;
}

.st-node--done {
  border-color: var(--green);
  color: var(--green);
  background: rgba(5, 150, 105, 0.1);
}

.st-node--active {
  border-color: var(--indigo-light);
  color: white;
  background: rgba(99, 102, 241, 0.2);
  box-shadow: 0 0 16px rgba(99, 102, 241, 0.3);
}

.st-node--locked {
  opacity: 0.3;
}

/* ── Courses ── */
.courses-section {
  padding: 6rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.courses-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.courses-header h2 {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.filter-tabs {
  display: flex;
  gap: 0.4rem;
}

.ft-btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  font-family: "Outfit", sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  border-radius: 6px;
  cursor: pointer;
  transition: all 0.2s;
}

.ft-btn.active,
.ft-btn:hover {
  background: var(--indigo);
  color: white;
  border-color: var(--indigo);
}

.courses-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.course-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  cursor: pointer;
}

.course-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 48px rgba(79, 70, 229, 0.12);
}

.cc-art {
  height: 140px;
}

.cc-art--1 {
  background: linear-gradient(135deg, #4f46e5, #7c3aed);
}
.cc-art--2 {
  background: linear-gradient(135deg, #0891b2, #0d9488);
}
.cc-art--3 {
  background: linear-gradient(135deg, #d97706, #dc2626);
}
.cc-art--4 {
  background: linear-gradient(135deg, #7c3aed, #db2777);
}
.cc-art--5 {
  background: linear-gradient(135deg, #059669, #0891b2);
}
.cc-art--6 {
  background: linear-gradient(135deg, #1d4ed8, #4f46e5);
}

.cc-body {
  padding: 1.25rem;
}

.cc-tags {
  display: flex;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.cc-tag {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  background: var(--indigo-dim);
  color: var(--indigo);
}

.cc-tag--dev {
  background: rgba(8, 145, 178, 0.1);
  color: #0891b2;
}
.cc-tag--data {
  background: rgba(217, 119, 6, 0.1);
  color: var(--amber);
}

.cc-level {
  font-size: 0.65rem;
  font-weight: 500;
  color: var(--muted);
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--border);
  border-radius: 4px;
}

.cc-body h3 {
  font-size: 1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  line-height: 1.3;
}

.cc-body p {
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.65;
  margin-bottom: 1rem;
}

.cc-footer {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.cc-progress-bar {
  height: 4px;
  background: var(--surface);
  border-radius: 2px;
  overflow: hidden;
}

.cc-progress-fill {
  height: 100%;
  width: var(--w, 0%);
  background: var(--indigo);
  border-radius: 2px;
  transform-origin: left;
  transform: scaleX(0);
}

.cc-meta {
  display: flex;
  gap: 0.4rem;
  font-size: 0.72rem;
  color: var(--muted);
}

.cc-dot {
  color: var(--border);
}

/* ── Pricing ── */
.pricing-section {
  padding: 6rem 3rem;
  background: var(--surface);
  border-top: 1px solid var(--border);
}

.pricing-header {
  text-align: center;
  margin-bottom: 3rem;
}

.pricing-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  max-width: 900px;
  margin: 0 auto;
}

.price-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 2rem;
  position: relative;
}

.price-card--featured {
  border-color: var(--indigo);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

.prce-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0.25rem 0.75rem;
  background: var(--indigo);
  color: white;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  border-radius: 100px;
  white-space: nowrap;
}

.prce-tier {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.prce-price {
  font-family: "JetBrains Mono", monospace;
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 1.5rem;
  line-height: 1;
}

.prce-price span {
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 400;
}

.prce-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.prce-features li {
  font-size: 0.85rem;
  color: var(--text);
}

.prce-off {
  color: var(--muted);
  text-decoration: line-through;
}

/* ── FAQ accordion ── */
.faq-section {
  padding: 6rem 3rem;
  max-width: 700px;
  margin: 0 auto;
}

.faq-section h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 2.5rem;
}

.accordion {
  border-top: 1px solid var(--border);
}

.acc-item {
  border-bottom: 1px solid var(--border);
}

.acc-trigger {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  font-family: "Outfit", sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text);
  text-align: left;
  transition: color 0.2s;
}

.acc-trigger:hover {
  color: var(--indigo);
}

.at-arrow {
  font-size: 1.3rem;
  font-weight: 300;
  color: var(--muted);
  flex-shrink: 0;
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.2s;
}

.acc-trigger:hover .at-arrow {
  color: var(--indigo);
}

.acc-body {
  overflow: hidden;
  height: 0;
}

.acc-inner {
  padding: 0 0 1.25rem;
}

.acc-inner p {
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.8;
}

/* ── Footer ── */
.footer {
  padding: 1.5rem 3rem;
  background: var(--text);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: white;
  font-weight: 700;
  font-size: 0.9rem;
}

.footer-brand .logo-mark {
  background: white;
}
.footer-brand .logo-mark::after {
  background: rgba(17, 18, 48, 0.3);
}

.footer p {
  font-size: 0.72rem;
  color: rgba(255, 255, 255, 0.4);
}

/* ── Responsive ── */
@media (max-width: 1024px) {
  .hero-inner {
    grid-template-columns: 1fr;
  }
  .skills-inner {
    grid-template-columns: 1fr;
  }
  .courses-grid {
    grid-template-columns: 1fr 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    max-width: 400px;
  }
}

@media (max-width: 768px) {
  .nav {
    padding: 1rem 1.5rem;
  }
  .nav-links {
    display: none;
  }
  .hero {
    padding: 6rem 1.5rem 4rem;
  }
  .skills-section,
  .courses-section {
    padding: 4rem 1.5rem;
  }
  .pricing-section,
  .faq-section {
    padding: 4rem 1.5rem;
  }
  .courses-grid {
    grid-template-columns: 1fr;
  }
  .hero-visual {
    display: none;
  }
  .courses-header {
    flex-direction: column;
  }
  .footer {
    flex-direction: column;
    gap: 0.75rem;
    text-align: center;
    padding: 1.5rem;
  }
}

/* ── Reduced motion ── */
html.reduced-motion .course-card:hover {
  transform: none;
}
html.reduced-motion .hb-dot {
  animation: none;
}
html.reduced-motion .btn-primary:hover {
  transform: none;
}
html.reduced-motion * {
  transition-duration: 0.01ms !important;
}

if (!window.MotionPreference) {
  const __mql = window.matchMedia("(prefers-reduced-motion: reduce)");
  const __listeners = new Set();

  const MotionPreference = {
    prefersReducedMotion() {
      return __mql.matches;
    },
    setOverride(value) {
      const reduced = Boolean(value);
      document.documentElement.classList.toggle("reduced-motion", reduced);
      window.dispatchEvent(new CustomEvent("motion-preference", { detail: { reduced } }));
      for (const listener of __listeners) {
        try {
          listener({ reduced, override: reduced, systemReduced: __mql.matches });
        } catch {}
      }
    },
    onChange(listener) {
      __listeners.add(listener);
      try {
        listener({
          reduced: __mql.matches,
          override: null,
          systemReduced: __mql.matches,
        });
      } catch {}
      return () => __listeners.delete(listener);
    },
    getState() {
      return { reduced: __mql.matches, override: null, systemReduced: __mql.matches };
    },
  };

  window.MotionPreference = MotionPreference;
}

function prefersReducedMotion() {
  return window.MotionPreference.prefersReducedMotion();
}

function initDemoShell() {
  // No-op shim in imported standalone snippets.
}

import gsap from "gsap";
import { ScrollTrigger } from "gsap/ScrollTrigger";
import Lenis from "lenis";

gsap.registerPlugin(ScrollTrigger);

initDemoShell({
  title: "Meridian — E-Learning Platform",
  category: "pages",
  tech: ["gsap", "scroll-trigger", "lenis", "accordion", "canvas-2d", "outfit"],
});

const reduced = prefersReducedMotion();
if (reduced) document.documentElement.classList.add("reduced-motion");

// ── Lenis ─────────────────────────────────────────────────────────────────────
const lenis = new Lenis({ lerp: 0.1, smoothWheel: true });
lenis.on("scroll", ScrollTrigger.update);
gsap.ticker.add((time) => lenis.raf(time * 1000));
gsap.ticker.lagSmoothing(0);

// ── Nav ───────────────────────────────────────────────────────────────────────
// Nav is always visible (solid), no scroll-triggered changes needed

// ── Hero entrance ─────────────────────────────────────────────────────────────
if (!reduced) {
  gsap.set([".hero-badge", ".hero-h1", ".hero-p", ".hero-actions", ".hero-stats"], {
    opacity: 0,
    y: 20,
  });
  gsap.set(".progress-card", { opacity: 0, x: 30 });
  gsap.set(".skill-badge", { opacity: 0, scale: 0.8 });

  gsap
    .timeline({ delay: 0.3, defaults: { ease: "expo.out" } })
    .to(".hero-badge", { opacity: 1, y: 0, duration: 0.6 })
    .to(".hero-h1", { opacity: 1, y: 0, duration: 0.9 }, "-=0.3")
    .to(".hero-p", { opacity: 1, y: 0, duration: 0.7 }, "-=0.5")
    .to(".hero-actions", { opacity: 1, y: 0, duration: 0.6 }, "-=0.4")
    .to(".hero-stats", { opacity: 1, y: 0, duration: 0.6 }, "-=0.3")
    .to(".progress-card", { opacity: 1, x: 0, duration: 0.9, ease: "back.out(1.5)" }, 0.5)
    .to(
      ".skill-badge",
      { opacity: 1, scale: 1, duration: 0.5, stagger: 0.1, ease: "back.out(2)" },
      0.8
    );
}

// ── Hero stat counters ────────────────────────────────────────────────────────
document.querySelectorAll(".hs-num").forEach((el) => {
  const target = parseFloat(el.dataset.target);
  const suffix = el.dataset.suffix || "";
  if (!reduced) {
    ScrollTrigger.create({
      trigger: ".hero-stats",
      start: "top 85%",
      end: "top 30%",
      onUpdate: (self) => {
        const val = Math.round(target * self.progress);
        el.textContent = val.toLocaleString() + suffix;
      },
    });
  } else {
    el.textContent = target.toLocaleString() + suffix;
  }
});

// ── Progress card animation ───────────────────────────────────────────────────
if (!reduced) {
  // Animate progress bar to 37%
  gsap.to("#pc-fill", {
    width: "37%",
    duration: 1.5,
    ease: "expo.out",
    delay: 1.2,
    onUpdate: function () {
      const w = parseFloat(this.targets()[0].style.width);
      document.getElementById("pc-pct").textContent = Math.round(w) + "%";
    },
  });

  // Floating skill badges gently float
  document.querySelectorAll(".skill-badge").forEach((badge, i) => {
    gsap.to(badge, {
      y: -8 + (i % 2) * 16,
      duration: 2 + i * 0.3,
      repeat: -1,
      yoyo: true,
      ease: "sine.inOut",
      delay: i * 0.5,
    });
  });
} else {
  document.getElementById("pc-fill").style.width = "37%";
  document.getElementById("pc-pct").textContent = "37%";
}

// ── Skill tree canvas ─────────────────────────────────────────────────────────
const treeCanvas = document.getElementById("tree-canvas");
if (treeCanvas) {
  const tctx = treeCanvas.getContext("2d");
  function drawTree() {
    treeCanvas.width = treeCanvas.offsetWidth;
    treeCanvas.height = treeCanvas.offsetHeight;

    const COL_W = 110;
    const ROW_H = 60;
    const X_OFF = 60; // center of first col

    // Connections: [fromCol, fromRow, toCol, toRow, done]
    const connections = [
      [2, 1, 1, 2, true],
      [2, 1, 3, 2, true],
      [1, 2, 2, 3, false],
      [3, 2, 2, 3, false],
      [2, 3, 1, 4, false],
      [2, 3, 3, 4, false],
      [1, 4, 2, 5, false],
      [3, 4, 2, 5, false],
      [2, 5, 1, 6, false],
      [2, 5, 3, 6, false],
    ];

    connections.forEach(([c1, r1, c2, r2, done]) => {
      const x1 = (c1 - 1) * COL_W + X_OFF + 50;
      const y1 = (r1 - 1) * ROW_H + 28;
      const x2 = (c2 - 1) * COL_W + X_OFF + 50;
      const y2 = (r2 - 1) * ROW_H + 28;

      tctx.beginPath();
      tctx.moveTo(x1, y1);
      tctx.bezierCurveTo(x1, (y1 + y2) / 2, x2, (y1 + y2) / 2, x2, y2);
      tctx.strokeStyle = done ? "rgba(5, 150, 105, 0.5)" : "rgba(255, 255, 255, 0.08)";
      tctx.lineWidth = 1.5;
      tctx.stroke();
    });
  }
  drawTree();
  window.addEventListener("resize", drawTree);
}

// ── Course progress bars animate on scroll ────────────────────────────────────
if (!reduced) {
  document.querySelectorAll(".cc-progress-fill").forEach((fill, i) => {
    gsap.to(fill, {
      scaleX: 1,
      duration: 1,
      ease: "expo.out",
      delay: i * 0.08,
      scrollTrigger: {
        trigger: ".courses-grid",
        start: "top 75%",
        toggleActions: "play none none reverse",
      },
    });
  });
}

// ── Course cards reveal ───────────────────────────────────────────────────────
if (!reduced) {
  document.querySelectorAll(".course-card").forEach((card, i) => {
    gsap.set(card, { opacity: 0, y: 30 });
    gsap.to(card, {
      opacity: 1,
      y: 0,
      duration: 0.8,
      ease: "expo.out",
      delay: i * 0.08,
      scrollTrigger: {
        trigger: ".courses-grid",
        start: "top 75%",
        toggleActions: "play none none reverse",
      },
    });
  });
}

// ── Filter tabs ───────────────────────────────────────────────────────────────
document.querySelectorAll(".ft-btn").forEach((btn) => {
  btn.addEventListener("click", () => {
    document.querySelectorAll(".ft-btn").forEach((b) => b.classList.remove("active"));
    btn.classList.add("active");
    // In a real implementation: filter .course-card by data-category
    // Here we just toggle the active class for the demo
  });
});

// ── Pricing cards reveal ──────────────────────────────────────────────────────
if (!reduced) {
  gsap.set(".price-card", { opacity: 0, y: 25 });
  gsap.to(".price-card", {
    opacity: 1,
    y: 0,
    duration: 0.8,
    stagger: 0.12,
    ease: "expo.out",
    scrollTrigger: {
      trigger: ".pricing-grid",
      start: "top 75%",
      toggleActions: "play none none reverse",
    },
  });
}

// ── Skill tree nodes reveal ───────────────────────────────────────────────────
if (!reduced) {
  gsap.set(".st-node", { opacity: 0, scale: 0.8 });
  gsap.to(".st-node", {
    opacity: 1,
    scale: 1,
    duration: 0.5,
    stagger: 0.07,
    ease: "back.out(1.5)",
    scrollTrigger: {
      trigger: ".skill-tree",
      start: "top 70%",
      toggleActions: "play none none reverse",
    },
  });
}

// ── FAQ Accordion ─────────────────────────────────────────────────────────────
const DURATION = reduced ? 0 : 0.4;

document.querySelectorAll("#faq-acc .acc-trigger").forEach((trigger) => {
  const item = trigger.closest(".acc-item");
  const body = item.querySelector(".acc-body");
  const arrow = trigger.querySelector(".at-arrow");
  gsap.set(body, { height: 0, overflow: "hidden" });

  trigger.addEventListener("click", () => {
    const isOpen = item.classList.contains("is-open");

    // Close all
    document.querySelectorAll("#faq-acc .acc-item").forEach((other) => {
      if (other !== item && other.classList.contains("is-open")) {
        other.classList.remove("is-open");
        other.querySelector(".acc-trigger").setAttribute("aria-expanded", "false");
        gsap.to(other.querySelector(".acc-body"), {
          height: 0,
          duration: DURATION,
          ease: "expo.in",
          overwrite: true,
        });
        gsap.to(other.querySelector(".at-arrow"), {
          rotation: 0,
          duration: DURATION * 0.7,
          ease: "power2.in",
          overwrite: true,
        });
      }
    });

    if (isOpen) {
      item.classList.remove("is-open");
      trigger.setAttribute("aria-expanded", "false");
      gsap.to(body, { height: 0, duration: DURATION, ease: "expo.in", overwrite: true });
      gsap.to(arrow, { rotation: 0, duration: DURATION * 0.7, ease: "power2.in", overwrite: true });
    } else {
      item.classList.add("is-open");
      trigger.setAttribute("aria-expanded", "true");
      gsap.to(body, { height: "auto", duration: DURATION, ease: "expo.out", overwrite: true });
      gsap.to(arrow, { rotation: 45, duration: DURATION, ease: "back.out(2)", overwrite: true });
    }
  });
});

// ── Motion toggle ─────────────────────────────────────────────────────────────
window.addEventListener("motion-preference", (e) => {
  gsap.globalTimeline.paused(e.detail.reduced);
});

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Meridian — Learn Without Limits</title>
  <link rel="preconnect" href="https://fonts.googleapis.com">
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  <link rel="stylesheet" href="style.css">
    <script type="importmap">{"imports":{"gsap":"https://esm.sh/[email protected]","gsap/ScrollTrigger":"https://esm.sh/[email protected]/ScrollTrigger","gsap/SplitText":"https://esm.sh/[email protected]/SplitText","gsap/Flip":"https://esm.sh/[email protected]/Flip","gsap/ScrambleTextPlugin":"https://esm.sh/[email protected]/ScrambleTextPlugin","gsap/TextPlugin":"https://esm.sh/[email protected]/TextPlugin","gsap/all":"https://esm.sh/[email protected]/all","gsap/":"https://esm.sh/[email protected]/","lenis":"https://esm.sh/[email protected]/dist/lenis.mjs","three":"https://esm.sh/[email protected]","three/addons/":"https://esm.sh/[email protected]/examples/jsm/"}}</script>
  <style>html.lenis,
html.lenis body {
  height: auto;
}

.lenis:not(.lenis-autoToggle).lenis-stopped {
  overflow: clip;
}

.lenis [data-lenis-prevent],
.lenis [data-lenis-prevent-wheel],
.lenis [data-lenis-prevent-touch] {
  overscroll-behavior: contain;
}

.lenis.lenis-smooth iframe {
  pointer-events: none;
}

.lenis.lenis-autoToggle {
  transition-property: overflow;
  transition-duration: 1ms;
  transition-behavior: allow-discrete;
}</style>
</head>
<body>

  <!-- Nav -->
  <nav class="nav" id="nav">
    <a href="#" class="nav-logo">
      <div class="logo-mark"></div>
      <span>Meridian</span>
    </a>
    <ul class="nav-links">
      <li><a href="#courses">Courses</a></li>
      <li><a href="#paths">Learning Paths</a></li>
      <li><a href="#skills">Skills</a></li>
      <li><a href="#pricing">Pricing</a></li>
    </ul>
    <div class="nav-ctas">
      <a href="#" class="btn-text">Log in</a>
      <a href="#" class="btn-primary">Start Free</a>
    </div>
  </nav>

  <!-- Hero -->
  <section class="hero">
    <div class="hero-inner">
      <div class="hero-text">
        <div class="hero-badge">
          <span class="hb-dot"></span>
          <span>2,400+ learners enrolled this week</span>
        </div>
        <h1 class="hero-h1">
          Learn skills that<br>
          <span class="h1-highlight">actually matter.</span>
        </h1>
        <p class="hero-p">Structured paths from beginner to job-ready. Expert instructors, real projects, and a community that keeps you accountable.</p>
        <div class="hero-actions">
          <a href="#courses" class="btn-primary btn-primary--lg">Browse Courses</a>
          <a href="#" class="btn-ghost">See how it works →</a>
        </div>
        <div class="hero-stats">
          <div class="hs-item">
            <span class="hs-num" data-target="48000" data-suffix="">0</span>
            <span class="hs-label">Students</span>
          </div>
          <div class="hs-div"></div>
          <div class="hs-item">
            <span class="hs-num" data-target="320" data-suffix="+">0</span>
            <span class="hs-label">Courses</span>
          </div>
          <div class="hs-div"></div>
          <div class="hs-item">
            <span class="hs-num" data-target="94" data-suffix="%">0</span>
            <span class="hs-label">Completion rate</span>
          </div>
        </div>
      </div>
      <div class="hero-visual">
        <!-- Progress card -->
        <div class="progress-card" id="progress-card">
          <div class="pc-header">
            <div class="pc-avatar"></div>
            <div class="pc-meta">
              <strong>Design Systems</strong>
              <span>Week 3 of 8</span>
            </div>
            <span class="pc-pct" id="pc-pct">0%</span>
          </div>
          <div class="pc-progress">
            <div class="pc-fill" id="pc-fill"></div>
          </div>
          <div class="pc-lessons">
            <div class="pc-lesson pc-lesson--done">✓ Introduction to tokens</div>
            <div class="pc-lesson pc-lesson--done">✓ Color scales</div>
            <div class="pc-lesson pc-lesson--active">▶ Typography system</div>
            <div class="pc-lesson">○ Spacing & grid</div>
            <div class="pc-lesson">○ Component variants</div>
          </div>
        </div>
        <!-- Floating skill badges -->
        <div class="skill-badge sb--1">Figma</div>
        <div class="skill-badge sb--2">Design Systems</div>
        <div class="skill-badge sb--3">React</div>
        <div class="skill-badge sb--4">CSS</div>
      </div>
    </div>
  </section>

  <!-- Skill tree -->
  <section class="skills-section" id="skills">
    <div class="skills-inner">
      <div class="skills-header">
        <span class="section-tag">Learning Path</span>
        <h2>Your skill tree,<br>visualized.</h2>
        <p>Every course unlocks the next. See exactly where you are and where you're headed.</p>
      </div>
      <div class="skill-tree" id="skill-tree">
        <canvas id="tree-canvas" aria-hidden="true"></canvas>
        <!-- Nodes -->
        <div class="st-node st-node--done" style="--col:2; --row:1">HTML & CSS</div>
        <div class="st-node st-node--done" style="--col:1; --row:2">Flexbox</div>
        <div class="st-node st-node--done" style="--col:3; --row:2">Grid</div>
        <div class="st-node st-node--active" style="--col:2; --row:3">JavaScript</div>
        <div class="st-node" style="--col:1; --row:4">React</div>
        <div class="st-node" style="--col:3; --row:4">TypeScript</div>
        <div class="st-node" style="--col:2; --row:5">Full-Stack</div>
        <div class="st-node st-node--locked" style="--col:1; --row:6">Next.js</div>
        <div class="st-node st-node--locked" style="--col:3; --row:6">Node.js</div>
      </div>
    </div>
  </section>

  <!-- Courses grid -->
  <section class="courses-section" id="courses">
    <div class="courses-header">
      <span class="section-tag">Featured Courses</span>
      <h2>What do you want to learn?</h2>
      <div class="filter-tabs">
        <button class="ft-btn active" data-filter="all">All</button>
        <button class="ft-btn" data-filter="design">Design</button>
        <button class="ft-btn" data-filter="dev">Development</button>
        <button class="ft-btn" data-filter="data">Data</button>
      </div>
    </div>
    <div class="courses-grid">
      <article class="course-card" data-category="design">
        <div class="cc-art cc-art--1"></div>
        <div class="cc-body">
          <div class="cc-tags"><span class="cc-tag">Design</span><span class="cc-level">Beginner</span></div>
          <h3>UI Fundamentals</h3>
          <p>Learn the principles that make great interfaces — contrast, hierarchy, whitespace, and motion.</p>
          <div class="cc-footer">
            <div class="cc-progress-bar"><div class="cc-progress-fill" style="--w: 0%"></div></div>
            <div class="cc-meta"><span>24 lessons</span><span class="cc-dot">·</span><span>4.8 ★</span></div>
          </div>
        </div>
      </article>
      <article class="course-card" data-category="dev">
        <div class="cc-art cc-art--2"></div>
        <div class="cc-body">
          <div class="cc-tags"><span class="cc-tag cc-tag--dev">Dev</span><span class="cc-level">Intermediate</span></div>
          <h3>React + TypeScript</h3>
          <p>Build scalable applications with modern React patterns, TypeScript, and component architecture.</p>
          <div class="cc-footer">
            <div class="cc-progress-bar"><div class="cc-progress-fill" style="--w: 0%"></div></div>
            <div class="cc-meta"><span>36 lessons</span><span class="cc-dot">·</span><span>4.9 ★</span></div>
          </div>
        </div>
      </article>
      <article class="course-card" data-category="data">
        <div class="cc-art cc-art--3"></div>
        <div class="cc-body">
          <div class="cc-tags"><span class="cc-tag cc-tag--data">Data</span><span class="cc-level">Beginner</span></div>
          <h3>Python for Data</h3>
          <p>From pandas to machine learning fundamentals — a practical path through data science with Python.</p>
          <div class="cc-footer">
            <div class="cc-progress-bar"><div class="cc-progress-fill" style="--w: 0%"></div></div>
            <div class="cc-meta"><span>42 lessons</span><span class="cc-dot">·</span><span>4.7 ★</span></div>
          </div>
        </div>
      </article>
      <article class="course-card" data-category="design">
        <div class="cc-art cc-art--4"></div>
        <div class="cc-body">
          <div class="cc-tags"><span class="cc-tag">Design</span><span class="cc-level">Advanced</span></div>
          <h3>Motion Design Systems</h3>
          <p>GSAP, Framer Motion, and principled animation choreography for production interfaces.</p>
          <div class="cc-footer">
            <div class="cc-progress-bar"><div class="cc-progress-fill" style="--w: 0%"></div></div>
            <div class="cc-meta"><span>28 lessons</span><span class="cc-dot">·</span><span>5.0 ★</span></div>
          </div>
        </div>
      </article>
      <article class="course-card" data-category="dev">
        <div class="cc-art cc-art--5"></div>
        <div class="cc-body">
          <div class="cc-tags"><span class="cc-tag cc-tag--dev">Dev</span><span class="cc-level">Intermediate</span></div>
          <h3>CSS Architecture</h3>
          <p>Design tokens, cascade layers, logical properties, and building design systems with modern CSS.</p>
          <div class="cc-footer">
            <div class="cc-progress-bar"><div class="cc-progress-fill" style="--w: 0%"></div></div>
            <div class="cc-meta"><span>18 lessons</span><span class="cc-dot">·</span><span>4.8 ★</span></div>
          </div>
        </div>
      </article>
      <article class="course-card" data-category="data">
        <div class="cc-art cc-art--6"></div>
        <div class="cc-body">
          <div class="cc-tags"><span class="cc-tag cc-tag--data">Data</span><span class="cc-level">Advanced</span></div>
          <h3>Data Visualization</h3>
          <p>D3.js, Observable Plot, and Canvas 2D — telling stories with data that people actually understand.</p>
          <div class="cc-footer">
            <div class="cc-progress-bar"><div class="cc-progress-fill" style="--w: 0%"></div></div>
            <div class="cc-meta"><span>31 lessons</span><span class="cc-dot">·</span><span>4.9 ★</span></div>
          </div>
        </div>
      </article>
    </div>
  </section>

  <!-- Pricing -->
  <section class="pricing-section" id="pricing">
    <div class="pricing-header">
      <span class="section-tag">Pricing</span>
      <h2>Simple, honest pricing.</h2>
    </div>
    <div class="pricing-grid">
      <div class="price-card">
        <div class="prce-tier">Free</div>
        <div class="prce-price">$0<span>/mo</span></div>
        <ul class="prce-features">
          <li>✓ 5 courses</li>
          <li>✓ Community access</li>
          <li>✓ Basic projects</li>
          <li class="prce-off">✗ Certificates</li>
          <li class="prce-off">✗ Mentor sessions</li>
        </ul>
        <a href="#" class="btn-outline-dark">Get started free</a>
      </div>
      <div class="price-card price-card--featured">
        <div class="prce-badge">Most Popular</div>
        <div class="prce-tier">Pro</div>
        <div class="prce-price">$29<span>/mo</span></div>
        <ul class="prce-features">
          <li>✓ All 320+ courses</li>
          <li>✓ Learning paths</li>
          <li>✓ Real projects + feedback</li>
          <li>✓ Certificates</li>
          <li>✓ 2 mentor sessions/mo</li>
        </ul>
        <a href="#" class="btn-primary">Start 7-day trial</a>
      </div>
      <div class="price-card">
        <div class="prce-tier">Team</div>
        <div class="prce-price">$19<span>/seat/mo</span></div>
        <ul class="prce-features">
          <li>✓ Everything in Pro</li>
          <li>✓ Team analytics</li>
          <li>✓ Custom paths</li>
          <li>✓ Priority support</li>
          <li>✓ Unlimited mentoring</li>
        </ul>
        <a href="#" class="btn-outline-dark">Contact sales</a>
      </div>
    </div>
  </section>

  <!-- FAQ accordion -->
  <section class="faq-section">
    <div class="faq-inner">
      <span class="section-tag">FAQ</span>
      <h2>Common questions</h2>
      <div class="accordion" id="faq-acc">
        <div class="acc-item">
          <button class="acc-trigger" aria-expanded="false">
            <span>Can I cancel anytime?</span>
            <span class="at-arrow">+</span>
          </button>
          <div class="acc-body">
            <div class="acc-inner"><p>Yes — no contracts, no lock-in. Cancel with a single click from your dashboard. You'll keep access until the end of your billing period.</p></div>
          </div>
        </div>
        <div class="acc-item">
          <button class="acc-trigger" aria-expanded="false">
            <span>Do I get a certificate?</span>
            <span class="at-arrow">+</span>
          </button>
          <div class="acc-body">
            <div class="acc-inner"><p>Pro and Team members receive verified completion certificates for every course. They're shareable directly to LinkedIn and as credential URLs.</p></div>
          </div>
        </div>
        <div class="acc-item">
          <button class="acc-trigger" aria-expanded="false">
            <span>How do learning paths work?</span>
            <span class="at-arrow">+</span>
          </button>
          <div class="acc-body">
            <div class="acc-inner"><p>A learning path is a curated sequence of courses that takes you from zero to a specific goal (e.g., "Frontend Developer" or "UX Researcher"). The skill tree unlocks as you progress through each course.</p></div>
          </div>
        </div>
        <div class="acc-item">
          <button class="acc-trigger" aria-expanded="false">
            <span>What if a course isn't right for me?</span>
            <span class="at-arrow">+</span>
          </button>
          <div class="acc-body">
            <div class="acc-inner"><p>Every course has a 30-minute free preview. If you're a Pro member and still find a course isn't right, contact us within 7 days for a full refund of that course.</p></div>
          </div>
        </div>
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