/* ==========================================================================
   Hebrew Mastery — Main Stylesheet
   Layout, typography, components, responsive nav, ad slot placeholders.
   No frameworks. Go-template ready: header/footer are separate partials.
   ========================================================================== */

/* ---------- Variables ---------- */
:root {
  --color-primary:      #1a2b4a;
  --color-primary-dark: #0f1d33;
  --color-accent:       #d4a017;
  --color-accent-hover: #b8860b;
  --color-bg:           #ffffff;
  --color-bg-alt:       #f4f6f9;
  --color-text:         #1f2937;
  --color-text-muted:   #6b7280;
  --color-border:       #e2e8f0;
  --container-width:    1200px;
  --container-padding:  1.25rem;
  --radius:             8px;
  --shadow-sm:          0 1px 3px rgba(0,0,0,.08);
  --shadow-md:          0 4px 16px rgba(0,0,0,.13);
  --font:               system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary); }
a:hover { color: var(--color-accent); }

/* ---------- Container ---------- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

/* ---------- Site Header ---------- */
.site-header {
  background: var(--color-primary);
  line-height: 0;
}
.site-header img {
  width: 100%;
  max-height: 200px;
  object-fit: cover;
  object-position: center;
}

/* ---------- Nav ---------- */
.site-nav {
  background: var(--color-primary);
  border-bottom: 3px solid var(--color-accent);
  position: sticky;
  top: 0;
  z-index: 100;
}
.site-nav .container {
  display: flex;
  align-items: center;
  min-height: 52px;
}
.nav-links {
  display: flex;
  list-style: none;
  flex-wrap: wrap;
}
.nav-links a {
  display: block;
  padding: 0.7rem 0.95rem;
  color: rgba(255,255,255,0.88);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
  white-space: nowrap;
}
.nav-links a:hover,
.nav-links a.active {
  background: var(--color-accent);
  color: var(--color-primary);
}
.hamburger {
  display: none;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  margin-left: auto;
  line-height: 1;
}

/* ---------- Ad Slots ---------- */
/* Structural placeholders — paste AdSense unit inside, label is for dev only */
.ad-slot {
  text-align: center;
  overflow: hidden;
  background: #fafafa;
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}
.ad-slot--leaderboard {
  width: 100%;
  min-height: 92px;
  padding: 4px 0;
}
.ad-slot--rectangle {
  display: inline-block;
  min-width: 300px;
  min-height: 250px;
}
.ad-slot__label {
  display: block;
  font-size: 0.65rem;
  color: #bbb;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: 2px;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius);
  font-weight: 600;
  text-decoration: none;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn--primary {
  background: var(--color-accent);
  color: var(--color-primary);
}
.btn--primary:hover { background: var(--color-accent-hover); color: var(--color-primary); }
.btn--outline {
  background: transparent;
  color: #fff;
  border: 2px solid rgba(255,255,255,0.65);
}
.btn--outline:hover { border-color: #fff; color: #fff; background: rgba(255,255,255,0.08); }
.btn--block { display: block; text-align: center; }

/* ---------- Hero (Home) ---------- */
.hero {
  background: linear-gradient(140deg, var(--color-primary) 0%, #2a4070 100%);
  color: #fff;
  padding: 4.5rem var(--container-padding) 4rem;
  text-align: center;
}
.hero h1 {
  font-size: clamp(1.9rem, 4.5vw, 3.2rem);
  font-weight: 800;
  margin-bottom: 1rem;
  letter-spacing: -0.025em;
  line-height: 1.15;
}
.hero p {
  font-size: clamp(1rem, 2.2vw, 1.2rem);
  opacity: 0.88;
  max-width: 580px;
  margin: 0 auto 2rem;
}
.hero-actions {
  display: flex;
  gap: 0.875rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ---------- Page Hero (inner pages) ---------- */
.page-hero {
  background: linear-gradient(140deg, var(--color-primary) 0%, #2a4070 100%);
  color: #fff;
  padding: 3rem var(--container-padding) 2.75rem;
  text-align: center;
}
.page-hero h1 {
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  font-weight: 800;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}
.page-hero p {
  opacity: 0.85;
  max-width: 540px;
  margin: 0 auto;
  font-size: 1.05rem;
}

/* ---------- Breadcrumb ---------- */
.breadcrumb-bar {
  background: var(--color-bg-alt);
  border-bottom: 1px solid var(--color-border);
}
.breadcrumb {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  padding: 0.65rem 0;
}
.breadcrumb a {
  color: var(--color-text-muted);
  text-decoration: none;
}
.breadcrumb a:hover { color: var(--color-accent); }
.breadcrumb__sep { margin: 0 0.35rem; }

/* ---------- Sections ---------- */
.section { padding: 3.5rem 0; }
.section--alt { background: var(--color-bg-alt); }
.section-title {
  font-size: clamp(1.4rem, 3vw, 2rem);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
  letter-spacing: -0.015em;
}
.section-lead {
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  font-size: 1.05rem;
  max-width: 600px;
}

/* ---------- Quick-start Card Grid ---------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 1.25rem;
}
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  color: inherit;
}
.card__icon {
  font-size: 2.4rem;
  margin-bottom: 0.875rem;
  line-height: 1;
}
.card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.4rem;
}
.card__desc {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.55;
}

/* ---------- Game Cards ---------- */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}
.game-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.game-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
}
.game-card__body {
  padding: 1.75rem 1.5rem 1.25rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.game-card__icon {
  font-size: 3rem;
  line-height: 1;
  margin-bottom: 1rem;
}
.game-card__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  margin-bottom: 0.875rem;
  align-self: flex-start;
}
.game-card__badge--beta {
  background: #fde68a;
  color: #78350f;
}
.game-card__title {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 0.5rem;
  line-height: 1.25;
}
.game-card__desc {
  color: var(--color-text-muted);
  font-size: 0.925rem;
  line-height: 1.65;
  flex: 1;
  margin-bottom: 1.5rem;
}
.game-card__footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}

/* ---------- Why-Learn List ---------- */
.why-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}
.why-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  line-height: 1.5;
}
.why-list li::before {
  content: "✓";
  font-weight: 800;
  color: var(--color-accent);
  font-size: 1rem;
  flex-shrink: 0;
  margin-top: 0.1rem;
}

/* ---------- Tips Box ---------- */
.tips-box {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  max-width: 680px;
}
.tips-box h2 {
  font-size: 1.1rem;
  color: var(--color-primary);
  margin-bottom: 1rem;
}
.tips-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}
.tips-list li {
  display: flex;
  gap: 0.65rem;
  font-size: 0.95rem;
  color: var(--color-text);
}
.tips-list li::before {
  content: "→";
  color: var(--color-accent);
  font-weight: 700;
  flex-shrink: 0;
}

/* ---------- Newsletter ---------- */
.newsletter {
  background: var(--color-primary);
  color: #fff;
  text-align: center;
  padding: 3rem var(--container-padding);
}
.newsletter h2 {
  font-size: clamp(1.3rem, 2.5vw, 1.7rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
}
.newsletter p {
  opacity: 0.8;
  margin-bottom: 1.5rem;
  font-size: 1rem;
}
.newsletter-form {
  display: flex;
  gap: 0.5rem;
  justify-content: center;
  flex-wrap: wrap;
  max-width: 480px;
  margin: 0 auto;
}
.newsletter-form input[type="email"] {
  flex: 1;
  min-width: 210px;
  padding: 0.75rem 1rem;
  border: none;
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font);
}
.newsletter-form input[type="email"]:focus {
  outline: 3px solid var(--color-accent);
}
.newsletter-form button {
  padding: 0.75rem 1.5rem;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  border: none;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  font-family: var(--font);
  transition: background 0.15s;
}
.newsletter-form button:hover { background: var(--color-accent-hover); }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.72);
  padding: 3.5rem 0 1.5rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}
.footer-brand__name {
  font-size: 1.25rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}
.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.65;
  max-width: 240px;
}
.footer-col h3 {
  color: #fff;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1rem;
}
.footer-col ul { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.footer-col a {
  color: rgba(255,255,255,0.6);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.15s;
}
.footer-col a:hover { color: var(--color-accent); }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 1.5rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.83rem;
  color: rgba(255,255,255,0.45);
}
.footer-bottom-links { display: flex; gap: 1.25rem; }
.footer-bottom-links a {
  color: rgba(255,255,255,0.45);
  text-decoration: none;
  transition: color 0.15s;
}
.footer-bottom-links a:hover { color: var(--color-accent); }

/* ---------- Lesson Index Cards ---------- */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 0.875rem;
}
.lesson-card {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.875rem 1.1rem;
  text-decoration: none;
  color: inherit;
  background: var(--color-bg);
  transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
}
.lesson-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  color: inherit;
}
.lesson-card--checkpoint { border-color: var(--color-accent); background: #fffbeb; }
.lesson-card__num {
  flex-shrink: 0;
  width: 34px;
  height: 34px;
  background: var(--color-primary);
  color: var(--color-accent);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 0.8rem;
}
.lesson-card__title {
  font-weight: 700;
  color: var(--color-primary);
  font-size: 0.93rem;
  margin-bottom: 0.15rem;
  line-height: 1.3;
}
.lesson-card__meta { font-size: 0.78rem; color: var(--color-text-muted); }

/* ---------- Lesson Page ---------- */
.lesson-num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-primary-dark);
  font-weight: 800;
  font-size: 1.2rem;
  margin-bottom: 1rem;
  flex-shrink: 0;
}
.vocab-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.25rem 0 2rem;
  font-size: 0.93rem;
}
.vocab-table th {
  background: var(--color-primary);
  color: #fff;
  padding: 0.6rem 1rem;
  text-align: left;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  white-space: nowrap;
}
.vocab-table td {
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: middle;
}
.vocab-table tr:nth-child(even) td { background: var(--color-bg-alt); }
.vocab-table tr:hover td { background: #fffbeb; }
.vocab-table .heb {
  font-size: 1.35rem;
  direction: rtl;
  color: var(--color-primary);
  font-weight: 600;
  line-height: 1.3;
  white-space: nowrap;
}
.vocab-table .trans { color: var(--color-text-muted); font-style: italic; }
.vocab-table .note { font-size: 0.82rem; color: #9ca3af; }
.table-wrap { overflow-x: auto; }
.lesson-note {
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-alt);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.875rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--color-text);
}
.lesson-note strong { color: var(--color-primary); }
.lesson-note--tip { border-color: #10b981; }
.lesson-note--warning { border-color: #f59e0b; }
.lesson-section-title {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary);
  margin: 2rem 0 0.5rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-accent);
  display: inline-block;
}
.lesson-pager {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--color-border);
  flex-wrap: wrap;
}
.lesson-pager a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 0.88rem;
  transition: background 0.15s, border-color 0.15s;
}
.lesson-pager a:hover {
  background: var(--color-accent);
  color: var(--color-primary-dark);
  border-color: var(--color-accent);
}
.lesson-pager__center {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-align: center;
}

/* ---------- Responsive ---------- */
@media (max-width: 960px) {
  .footer-grid { grid-template-columns: 1fr 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-brand p { max-width: 100%; }
}

@media (max-width: 768px) {
  .hamburger { display: block; }
  .nav-links {
    display: none;
    flex-direction: column;
    width: 100%;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
  .nav-links.open { display: flex; }
  .site-nav .container { flex-wrap: wrap; padding-top: 0.25rem; padding-bottom: 0.25rem; }

  .ad-slot--leaderboard { min-height: 52px; }

  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }

  .hero { padding: 3rem var(--container-padding); }
  .section { padding: 2.5rem 0; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .footer-brand { grid-column: auto; }
  .hero h1 { font-size: 1.75rem; }
  .games-grid { grid-template-columns: 1fr; }
  .card-grid { grid-template-columns: 1fr; }
}