/* ============================================
   Michal Reshef — Course Platform
   "Warm Editorial" Design System
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Heebo:wght@300;400;500;600;700;800;900&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@400;500;600;700;800&display=swap');

/* --- Tokens --- */
:root {
  --c-teal: #2b7a8c;
  --c-teal-deep: #1e5f6e;
  --c-teal-light: #3d9eb5;
  --c-teal-pale: #e8f4f7;
  --c-orange: #e88a3c;
  --c-orange-bright: #f5a623;
  --c-orange-glow: rgba(232, 138, 60, .15);
  --c-cream: #fffbf7;
  --c-cream-warm: #fff9f0;
  --c-sky: #f0f7fa;
  --c-white: #ffffff;
  --c-ink: #2e2e2e;
  --c-text: #3d3d3d;
  --c-text-soft: #6b6b6b;
  --c-border: #e6dfd6;
  --c-surface: #ffffff;
  --c-footer: #2a2a2a;

  --ff-he: 'Heebo', sans-serif;
  --ff-en: 'Nunito', sans-serif;
  --radius-sm: 8px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-pill: 100px;
  --shadow-soft: 0 2px 20px rgba(43, 122, 140, .06);
  --shadow-card: 0 4px 24px rgba(43, 122, 140, .08);
  --shadow-lift: 0 12px 40px rgba(43, 122, 140, .12);
  --ease-out: cubic-bezier(.22, 1, .36, 1);
  --max-w: 1120px;
  --header-h: 72px;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--ff-he);
  background: var(--c-cream);
  color: var(--c-text);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}
body[dir="rtl"] { direction: rtl; text-align: right; }
body[dir="ltr"] { direction: ltr; text-align: left; font-family: var(--ff-en); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }
button, input { font-family: inherit; }
main { flex: 1; }

/* --- Scroll reveal --- */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity .7s var(--ease-out), transform .7s var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4 {
  color: var(--c-teal);
  line-height: 1.25;
  font-weight: 800;
}
h1 { font-size: clamp(2rem, 5vw, 3.2rem); letter-spacing: -.02em; }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: 1.25rem; }
p { margin-bottom: 1rem; }

.section-label {
  display: inline-block;
  font-size: .8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .12em;
  color: var(--c-orange);
  margin-bottom: .75rem;
}

/* ============================================
   Layout
   ============================================ */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: 1.5rem;
}

.section {
  padding: 5rem 0;
  position: relative;
}

/* ============================================
   Header
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: rgba(255, 251, 247, .85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
  height: var(--header-h);
  transition: box-shadow .3s;
}
.site-header.scrolled {
  box-shadow: 0 2px 24px rgba(0,0,0,.06);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: 1.5rem;
  height: 100%;
}
.nav-logo { height: 46px; width: auto; }
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}
.nav-links a {
  font-size: .92rem;
  font-weight: 600;
  color: var(--c-text);
  position: relative;
  transition: color .25s;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  inset-inline-start: 0;
  width: 0;
  height: 2px;
  background: var(--c-orange);
  border-radius: 2px;
  transition: width .3s var(--ease-out);
}
.nav-links a:hover { color: var(--c-teal); }
.nav-links a:hover::after { width: 100%; }

.btn-nav {
  background: linear-gradient(135deg, var(--c-orange), var(--c-orange-bright)) !important;
  color: var(--c-white) !important;
  padding: .55rem 1.4rem;
  border-radius: var(--radius-pill);
  font-weight: 700 !important;
  transition: transform .25s var(--ease-out), box-shadow .25s !important;
}
.btn-nav::after { display: none !important; }
.btn-nav:hover {
  transform: translateY(-2px) !important;
  box-shadow: 0 6px 20px rgba(232, 138, 60, .35);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  width: 32px;
  height: 32px;
  cursor: pointer;
  position: relative;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: .3s;
  position: absolute;
}
.nav-toggle span { top: 50%; inset-inline-start: 4px; transform: translateY(-50%); }
.nav-toggle span::before { content: ''; top: -7px; }
.nav-toggle span::after { content: ''; top: 7px; }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { top: 0; transform: rotate(45deg); }
.nav-toggle.open span::after { top: 0; transform: rotate(-45deg); }

@media (max-width: 768px) {
  .nav-toggle { display: block; }
  .nav-links {
    display: none;
    flex-direction: column;
    position: fixed;
    top: var(--header-h);
    inset-inline-start: 0;
    inset-inline-end: 0;
    bottom: 0;
    background: var(--c-cream);
    padding: 2rem;
    gap: 1.5rem;
    z-index: 199;
  }
  .nav-links.open { display: flex; }
  .nav-links a { font-size: 1.15rem; }
}

/* ============================================
   Hero
   ============================================ */
.hero {
  position: relative;
  padding: 6rem 0 5rem;
  background: linear-gradient(170deg, var(--c-cream-warm) 0%, var(--c-sky) 60%, var(--c-teal-pale) 100%);
  overflow: hidden;
}

/* Decorative organic shapes */
.hero::before {
  content: '';
  position: absolute;
  top: -80px;
  inset-inline-end: -120px;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(43, 122, 140, .06) 0%, transparent 70%);
  pointer-events: none;
}
.hero::after {
  content: '';
  position: absolute;
  bottom: -100px;
  inset-inline-start: -80px;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--c-orange-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: 1.5rem;
  position: relative;
  z-index: 1;
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-pill);
  padding: .4rem 1rem;
  font-size: .85rem;
  font-weight: 600;
  color: var(--c-teal);
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-soft);
}

.hero h1 {
  margin-bottom: 1.2rem;
  max-width: 700px;
  margin-inline: auto;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--c-text-soft);
  max-width: 560px;
  margin: 0 auto 2.5rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  padding: .85rem 2rem;
  border-radius: var(--radius-pill);
  font-weight: 700;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  transition: all .3s var(--ease-out);
  text-align: center;
  font-family: inherit;
  line-height: 1.2;
}

.btn-primary {
  background: linear-gradient(135deg, var(--c-orange), var(--c-orange-bright));
  color: var(--c-white);
  box-shadow: 0 4px 16px rgba(232, 138, 60, .25);
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(232, 138, 60, .35);
}

.btn-secondary {
  background: var(--c-teal);
  color: var(--c-white);
}
.btn-secondary:hover {
  background: var(--c-teal-deep);
  transform: translateY(-3px);
  box-shadow: 0 8px 28px rgba(43, 122, 140, .2);
}

.btn-ghost {
  background: var(--c-white);
  color: var(--c-teal);
  border: 2px solid var(--c-teal);
}
.btn-ghost:hover {
  background: var(--c-teal);
  color: var(--c-white);
  transform: translateY(-3px);
}

.btn-large { padding: 1rem 2.6rem; font-size: 1.1rem; }
.btn-sm { padding: .55rem 1.4rem; font-size: .9rem; }

.btn-icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ============================================
   Wave Divider
   ============================================ */
.wave-divider {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: -2px;
}
.wave-divider-flip {
  transform: scaleY(-1);
  margin-top: -2px;
  margin-bottom: 0;
}

/* ============================================
   Cards
   ============================================ */
.card {
  background: var(--c-surface);
  border-radius: var(--radius);
  padding: 2rem;
  border: 1px solid var(--c-border);
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lift);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1rem;
  background: var(--c-teal-pale);
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

/* ============================================
   Section — Teal accent band
   ============================================ */
.section-teal {
  background: linear-gradient(135deg, var(--c-teal) 0%, var(--c-teal-light) 100%);
  color: var(--c-white);
}
.section-teal h2, .section-teal h3 { color: var(--c-white); }
.section-teal p { color: rgba(255,255,255,.88); }
.section-teal .section-label { color: rgba(255,255,255,.6); }

.section-sky { background: var(--c-sky); }

/* ============================================
   Course Grid
   ============================================ */
.course-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
  margin-top: 2rem;
}

.lesson-card {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.4rem;
  text-decoration: none;
  color: inherit;
  transition: all .3s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.lesson-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--c-teal-light);
}

.lesson-num {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--c-teal), var(--c-teal-light));
  color: var(--c-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1.1rem;
}

.lesson-info h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: .25rem;
}
.lesson-info p {
  font-size: .88rem;
  color: var(--c-text-soft);
  margin: 0;
  line-height: 1.5;
}

.lesson-card.locked {
  opacity: .5;
  pointer-events: none;
}
.lesson-card.locked::after {
  content: '🔒';
  position: absolute;
  top: 1rem;
  inset-inline-end: 1rem;
  font-size: 1rem;
}

.lesson-card.current {
  border-color: var(--c-orange);
  box-shadow: 0 0 0 3px var(--c-orange-glow);
}

/* ============================================
   Video Player
   ============================================ */
.video-wrap {
  background: var(--c-ink);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  margin-bottom: 2rem;
}
.video-wrap video {
  width: 100%;
  display: block;
}

.lesson-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2.5rem;
  align-items: start;
}
@media (max-width: 900px) {
  .lesson-layout { grid-template-columns: 1fr; }
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  margin-top: 2rem;
  padding-top: 2rem;
  border-top: 1px solid var(--c-border);
}

.lesson-sidebar {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  position: sticky;
  top: calc(var(--header-h) + 1.5rem);
}
.lesson-sidebar h3 {
  font-size: 1rem;
  margin-bottom: 1rem;
  padding-bottom: .75rem;
  border-bottom: 1px solid var(--c-border);
}
.sidebar-lessons {
  display: flex;
  flex-direction: column;
  gap: .4rem;
}
.sidebar-lessons a {
  display: flex;
  align-items: center;
  gap: .6rem;
  padding: .5rem .7rem;
  border-radius: var(--radius-sm);
  font-size: .88rem;
  font-weight: 500;
  color: var(--c-text-soft);
  transition: all .2s;
}
.sidebar-lessons a:hover {
  background: var(--c-sky);
  color: var(--c-teal);
}
.sidebar-lessons a.active {
  background: var(--c-teal-pale);
  color: var(--c-teal);
  font-weight: 700;
}
.sidebar-num {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: var(--c-border);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 800;
  flex-shrink: 0;
}
.sidebar-lessons a.active .sidebar-num {
  background: var(--c-teal);
  color: var(--c-white);
}

/* ============================================
   Forms
   ============================================ */
.auth-page {
  min-height: calc(100vh - var(--header-h));
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1.5rem;
  background:
    radial-gradient(ellipse at 20% 80%, var(--c-orange-glow) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(43, 122, 140, .06) 0%, transparent 50%),
    var(--c-cream);
}

.form-card {
  width: 100%;
  max-width: 440px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  box-shadow: var(--shadow-card);
}
.form-card h2 {
  text-align: center;
  margin-bottom: .5rem;
}
.form-card .form-subtitle {
  text-align: center;
  color: var(--c-text-soft);
  margin-bottom: 2rem;
  font-size: .95rem;
}

.form-group { margin-bottom: 1.25rem; }
.form-group label {
  display: block;
  margin-bottom: .4rem;
  font-weight: 600;
  font-size: .92rem;
  color: var(--c-text);
}
.form-group input {
  width: 100%;
  padding: .8rem 1rem;
  border: 1.5px solid var(--c-border);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  font-family: inherit;
  background: var(--c-cream);
  transition: border-color .25s, box-shadow .25s;
}
body[dir="rtl"] .form-group input[type="text"] {
  direction: rtl;
  text-align: right;
}
.form-group input[type="email"],
.form-group input[type="password"],
.form-group input[type="tel"] {
  direction: ltr;
  text-align: left;
}
.form-group input:focus {
  outline: none;
  border-color: var(--c-teal);
  box-shadow: 0 0 0 4px rgba(43, 122, 140, .08);
  background: var(--c-white);
}

.form-btn {
  width: 100%;
  margin-top: .5rem;
}

.form-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: .9rem;
  color: var(--c-text-soft);
}
.form-footer a {
  color: var(--c-teal);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.form-error,
.form-success {
  padding: .75rem 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: .9rem;
  display: none;
}
.form-error {
  background: #fef2f2;
  color: #b91c1c;
  border: 1px solid #fecaca;
}
.form-success {
  background: #f0fdf4;
  color: #166534;
  border: 1px solid #bbf7d0;
}

.form-note {
  background: var(--c-teal-pale);
  border-radius: var(--radius-sm);
  padding: .8rem 1rem;
  font-size: .88rem;
  color: var(--c-teal-deep);
  margin-bottom: 1.5rem;
  line-height: 1.6;
}

/* ============================================
   Book Section
   ============================================ */
.book-hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  padding: 4rem 0;
}
.book-hero-text h1 { margin-bottom: 1rem; }
.book-hero-text p { font-size: 1.05rem; color: var(--c-text-soft); }
.book-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 2rem; }

.book-cover {
  position: relative;
}
.book-cover-img {
  border-radius: var(--radius);
  box-shadow: var(--shadow-lift);
  transform: rotate(-2deg);
  transition: transform .4s var(--ease-out);
}
.book-cover:hover .book-cover-img {
  transform: rotate(0deg) scale(1.02);
}

@media (max-width: 768px) {
  .book-hero {
    grid-template-columns: 1fr;
    gap: 2rem;
    text-align: center;
  }
  .book-cover { max-width: 280px; margin: 0 auto; }
  .book-actions { justify-content: center; }
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
  background: var(--c-footer);
  color: rgba(255,255,255,.7);
  padding: 3rem 0 2rem;
  margin-top: auto;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: 1.5rem;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,.1);
  flex-wrap: wrap;
}
.footer-brand { max-width: 320px; }
.footer-brand-logo {
  height: 40px;
  margin-bottom: 1rem;
  filter: brightness(0) invert(1);
  opacity: .8;
}
.footer-brand p { font-size: .88rem; line-height: 1.7; color: rgba(255,255,255,.5); }

.footer-nav h4 {
  color: rgba(255,255,255,.9);
  font-size: .85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: .75rem;
}
.footer-nav a {
  display: block;
  font-size: .9rem;
  color: rgba(255,255,255,.55);
  padding: .2rem 0;
  transition: color .25s;
}
.footer-nav a:hover { color: var(--c-orange-bright); }

.social-links {
  display: flex;
  gap: .75rem;
}
.social-link {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(255,255,255,.08);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  color: rgba(255,255,255,.7);
  transition: all .25s;
}
.social-link:hover {
  background: var(--c-orange);
  color: var(--c-white);
  transform: translateY(-2px);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 1.5rem;
  font-size: .82rem;
  color: rgba(255,255,255,.35);
  flex-wrap: wrap;
  gap: .5rem;
}

/* ============================================
   Utilities
   ============================================ */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0 !important; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }
.hidden { display: none !important; }

/* Grain overlay — subtle texture */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: .025;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .section { padding: 3.5rem 0; }
  .hero { padding: 4rem 0 3.5rem; }
  .features-grid { grid-template-columns: 1fr; }
  .course-grid { grid-template-columns: 1fr; }
}