/* =====================================================
   ETHERLEARNING – Main Stylesheet
   Aesthetic: Refined Minimal · Ink on Paper
   ===================================================== */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;1,9..40,300&display=swap');

/* ── CSS Variables ─────────────────────────────────── */
:root {
  --ink: #0f0f14;
  --ink-soft: #3a3a4a;
  --ink-faint: #6b6b80;
  --paper: #f7f6f3;
  --paper-warm: #eeecea;
  --paper-mid: #e0deda;
  --accent: #3d4fd1;
  --accent-soft: #6875e8;
  --accent-glow: rgba(61,79,209,0.12);
  --success: #1a9e6b;
  --danger: #d13d3d;
  --warning: #d17e1a;
  --shadow-sm: 0 1px 3px rgba(15,15,20,0.08), 0 1px 2px rgba(15,15,20,0.06);
  --shadow-md: 0 4px 16px rgba(15,15,20,0.10), 0 2px 6px rgba(15,15,20,0.06);
  --shadow-lg: 0 12px 40px rgba(15,15,20,0.12), 0 4px 12px rgba(15,15,20,0.08);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;
  --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 400ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode */
[data-theme="dark"] {
  --ink: #f0efe9;
  --ink-soft: #c8c7bf;
  --ink-faint: #8a897f;
  --paper: #14131a;
  --paper-warm: #1c1b24;
  --paper-mid: #28273a;
  --accent: #6875e8;
  --accent-soft: #8a94f0;
  --accent-glow: rgba(104,117,232,0.15);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.35);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.4);
}

/* ── Reset & Base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background-color: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  transition: background-color var(--transition-slow), color var(--transition-slow);
  min-height: 100vh;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-soft); }
ul { list-style: none; }
button { cursor: pointer; font-family: var(--font-body); border: none; background: none; }

/* ── Typography ────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  line-height: 1.2;
  color: var(--ink);
}
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
p { color: var(--ink-soft); max-width: 68ch; }

/* ── Layout ────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 72px 0; }

/* ── Header / Nav ──────────────────────────────────── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247,246,243,0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--paper-mid);
  transition: background var(--transition-slow), border-color var(--transition-slow);
}

[data-theme="dark"] .site-header {
  background: rgba(20,19,26,0.92);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--ink);
  white-space: nowrap;
}

.logo-mark {
  width: 32px;
  height: 32px;
  background: var(--accent);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  font-family: var(--font-body);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.logo:hover .logo-mark { transform: rotate(-8deg) scale(1.05); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
}

.nav-links a:hover {
  color: var(--ink);
  background: var(--paper-warm);
}

.nav-links a.active { color: var(--accent); }

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--paper-warm);
  border: 1px solid var(--paper-mid);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  transition: background var(--transition), transform var(--transition);
  cursor: pointer;
}
.theme-toggle:hover { background: var(--paper-mid); transform: rotate(20deg); }

/* Hamburger */
.menu-toggle {
  display: none;
  width: 40px;
  height: 40px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  border-radius: var(--radius-sm);
  background: var(--paper-warm);
  border: 1px solid var(--paper-mid);
}

.menu-toggle span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

/* ── Buttons ───────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.92rem;
  font-weight: 500;
  font-family: var(--font-body);
  transition: all var(--transition);
  cursor: pointer;
  border: none;
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-soft);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px var(--accent-glow);
}

.btn-secondary {
  background: var(--paper-warm);
  color: var(--ink);
  border: 1px solid var(--paper-mid);
}
.btn-secondary:hover {
  background: var(--paper-mid);
  color: var(--ink);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--paper-mid);
}
.btn-ghost:hover {
  background: var(--paper-warm);
  color: var(--ink);
}

.btn-sm { padding: 7px 16px; font-size: 0.85rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 14px 30px; font-size: 1rem; border-radius: var(--radius-lg); }

/* ── Hero Canvas Animation ─────────────────────────── */
.hero {
  position: relative;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
  display: block;
}

/* Re-enable mouse events on canvas for hover effect */
.hero-canvas { pointer-events: auto; }

.hero-content {
  position: relative;
  z-index: 1;
}

/* ── Hero ──────────────────────────────────────────── */
.hero {
  padding: 80px 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -120px;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(ellipse at center, var(--accent-glow) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--accent-glow);
  border: 1px solid rgba(61,79,209,0.2);
  color: var(--accent);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 5px 14px;
  border-radius: 999px;
  margin-bottom: 24px;
  animation: fadeInUp 0.5s ease both;
}

[data-theme="dark"] .hero-badge {
  border-color: rgba(104,117,232,0.25);
}

.hero h1 {
  margin-bottom: 20px;
  animation: fadeInUp 0.5s 0.1s ease both;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero p {
  font-size: 1.1rem;
  margin: 0 auto 36px;
  animation: fadeInUp 0.5s 0.2s ease both;
}

.hero-cta {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.5s 0.3s ease both;
}

/* ── Game Cards ────────────────────────────────────── */
.games-section { padding: 60px 0; }

.section-label {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}

.section-title { margin-bottom: 10px; }
.section-desc { margin-bottom: 48px; }

.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
}

.game-card {
  background: var(--paper-warm);
  border: 1px solid var(--paper-mid);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
  position: relative;
  overflow: hidden;
}

.game-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-slow);
}

.game-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--accent);
}

.game-card:hover::before { transform: scaleX(1); }

.game-icon {
  width: 56px;
  height: 56px;
  background: var(--accent-glow);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
}

.game-card h3 { margin-bottom: 6px; }

.game-card p {
  font-size: 0.92rem;
  line-height: 1.65;
  flex-grow: 1;
  max-width: none;
}

.game-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.tag {
  font-size: 0.76rem;
  font-weight: 500;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--paper-mid);
  color: var(--ink-faint);
}

/* ── Daily Challenge ───────────────────────────────── */
.daily-section {
  background: var(--paper-warm);
  border-top: 1px solid var(--paper-mid);
  border-bottom: 1px solid var(--paper-mid);
}

.daily-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
}

.daily-content { flex: 1; min-width: 240px; }

.daily-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #fff;
  font-size: 0.78rem;
  font-weight: 600;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.daily-content h2 { margin-bottom: 12px; }

.daily-stats {
  display: flex;
  gap: 32px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.stat-item { text-align: left; }

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--ink);
  line-height: 1;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--ink-faint);
  margin-top: 3px;
}

.daily-visual {
  flex-shrink: 0;
}

.mini-sudoku {
  display: grid;
  grid-template-columns: repeat(9, 1fr);
  gap: 2px;
  width: 180px;
  height: 180px;
  background: var(--paper-mid);
  border-radius: var(--radius-md);
  padding: 8px;
  border: 2px solid var(--paper-mid);
}

.mini-cell {
  background: var(--paper);
  border-radius: 3px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.55rem;
  font-weight: 600;
  color: var(--ink);
}

.mini-cell.filled { color: var(--accent); }
.mini-cell.empty { color: transparent; }

/* ── How It Works ──────────────────────────────────── */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
  margin-top: 48px;
}

.step-card {
  text-align: center;
  padding: 32px 24px;
}

.step-number {
  width: 44px;
  height: 44px;
  background: var(--accent);
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 auto 16px;
}

.step-card h3 { margin-bottom: 10px; }
.step-card p { font-size: 0.9rem; margin: 0 auto; }

/* ── Ad Containers ─────────────────────────────────── */
.ad-container {
  text-align: center;
  padding: 16px;
  background: var(--paper-warm);
  border: 1px dashed var(--paper-mid);
  border-radius: var(--radius-md);
  color: var(--ink-faint);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 24px 0;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ad-container.banner { min-height: 90px; }
.ad-container.rectangle { min-height: 280px; max-width: 336px; }

/* ── Footer ────────────────────────────────────────── */
.site-footer {
  background: var(--ink);
  color: rgba(240,239,233,0.7);
  padding: 60px 0 32px;
}

[data-theme="dark"] .site-footer {
  background: #0a090f;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .logo-mark {
  background: rgba(104,117,232,0.8);
}

.footer-brand .logo {
  color: #f0efe9;
  margin-bottom: 16px;
  display: inline-flex;
}

.footer-brand p {
  font-size: 0.88rem;
  line-height: 1.7;
  color: rgba(240,239,233,0.55);
  max-width: 280px;
}

.footer-col h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(240,239,233,0.4);
  margin-bottom: 18px;
}

.footer-col ul { display: flex; flex-direction: column; gap: 10px; }

.footer-col a {
  font-size: 0.9rem;
  color: rgba(240,239,233,0.65);
  transition: color var(--transition);
}

.footer-col a:hover { color: #f0efe9; }

.footer-bottom {
  border-top: 1px solid rgba(240,239,233,0.1);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.footer-bottom p {
  font-size: 0.82rem;
  color: rgba(240,239,233,0.35);
  max-width: none;
}

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

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%       { opacity: 0.6; }
}

.animate-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.animate-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Inner Page Hero ───────────────────────────────── */
.page-hero {
  padding: 56px 0 40px;
  border-bottom: 1px solid var(--paper-mid);
}

.page-hero .section-label { display: block; margin-bottom: 10px; }
.page-hero h1 { margin-bottom: 12px; }
.page-hero p { font-size: 1.05rem; }

/* ── Prose (About, Privacy, Terms) ────────────────── */
.prose {
  max-width: 720px;
  margin: 56px auto;
}

.prose h2 { margin-top: 44px; margin-bottom: 16px; }
.prose h3 { margin-top: 28px; margin-bottom: 10px; font-size: 1.15rem; }
.prose p  { margin-bottom: 18px; font-size: 1rem; line-height: 1.75; }
.prose ul { padding-left: 24px; list-style: disc; margin-bottom: 18px; }
.prose ul li { margin-bottom: 8px; color: var(--ink-soft); font-size: 0.97rem; }
.prose a  { border-bottom: 1px solid var(--accent); }

/* ── Contact Form ──────────────────────────────────── */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
  padding: 56px 0;
}

.contact-info h2 { margin-bottom: 16px; }
.contact-info p  { margin-bottom: 24px; }

.contact-detail {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 0;
  border-top: 1px solid var(--paper-mid);
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.contact-icon {
  width: 36px;
  height: 36px;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 7px;
  color: var(--ink-soft);
}

.form-group input,
.form-group textarea,
.form-group select {
  width: 100%;
  padding: 12px 16px;
  background: var(--paper-warm);
  border: 1px solid var(--paper-mid);
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--ink);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group textarea { resize: vertical; min-height: 140px; }

/* ── Cookie Consent Banner ─────────────────────────── */
.cookie-banner {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(120px);
  z-index: 999;
  width: calc(100% - 48px);
  max-width: 680px;
  background: #1a1a24;
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 40px rgba(0,0,0,0.4);
  padding: 16px 20px;
  transition: transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1), opacity 0.4s ease;
  opacity: 0;
}

.cookie-banner.cookie-visible {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

.cookie-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.cookie-text {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 1;
  min-width: 200px;
}

.cookie-icon { font-size: 1.1rem; flex-shrink: 0; }

.cookie-text p {
  font-size: 0.85rem;
  color: rgba(240,239,233,0.75);
  margin: 0;
  max-width: none;
  line-height: 1.5;
}

.cookie-text a {
  color: rgba(240,239,233,0.95);
  text-decoration: underline;
  text-underline-offset: 2px;
}

.cookie-text a:hover { color: #fff; }

.cookie-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.cookie-btn {
  padding: 8px 18px;
  border-radius: var(--radius-md);
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  white-space: nowrap;
}

.cookie-reject {
  background: transparent;
  color: rgba(240,239,233,0.6);
  border: 1.5px solid rgba(240,239,233,0.2);
}

.cookie-reject:hover {
  background: rgba(240,239,233,0.08);
  color: rgba(240,239,233,0.9);
  border-color: rgba(240,239,233,0.4);
}

.cookie-accept {
  background: var(--accent);
  color: #fff;
}

.cookie-accept:hover {
  background: var(--accent-soft);
  transform: translateY(-1px);
}

@media (max-width: 480px) {
  .cookie-banner { bottom: 16px; padding: 14px 16px; }
  .cookie-inner  { flex-direction: column; gap: 12px; }
  .cookie-actions { width: 100%; justify-content: flex-end; }
}

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--paper-mid);
    padding: 16px 24px;
    gap: 4px;
    z-index: 99;
  }
  .menu-toggle { display: flex; }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
  .daily-inner { flex-direction: column; }
  .mini-sudoku { width: 140px; height: 140px; }
  .contact-layout { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 480px) {
  section { padding: 48px 0; }
  .hero { padding: 48px 0 40px; }
  .games-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}