/* ─── CSS VARIABLES ─────────────────────────────────────────────────── */
:root {
  --c-primary: #e65100;
  --c-primary-light: #ff8a50;
  --c-primary-dark: #ac1900;
  --c-accent: #1565c0;
  --c-accent-light: #5e92f3;
  --c-bg: #fafbfc;
  --c-surface: #ffffff;
  --c-surface-hover: #f5f7fa;
  --c-text: #1a1a2e;
  --c-text-secondary: #5a6072;
  --c-border: #e2e6ee;
  --c-success: #2e7d32;
  --c-success-bg: #e8f5e9;
  --c-error: #c62828;
  --c-error-bg: #ffebee;
  --c-warning: #f57f17;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,.12);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --transition: .2s ease;
}

/* ─── RESET & BASE ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--c-bg);
  color: var(--c-text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--c-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ─── HEADER ───────────────────────────────────────────────────────── */
.header {
  background: var(--c-surface);
  border-bottom: 1px solid var(--c-border);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--c-text);
}
.logo-flag { font-size: 28px; }
.logo-text { font-size: 20px; font-weight: 800; letter-spacing: -0.5px; }

.nav { display: flex; gap: 4px; }
.nav-link {
  background: none;
  border: none;
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-secondary);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}
.nav-link:hover { background: var(--c-surface-hover); color: var(--c-text); }
.nav-link.active { background: var(--c-primary); color: #fff; }

/* ─── NAV DROPDOWNS ──────────────────────────────────────────────── */
.nav-dropdown {
  position: relative;
}
.nav-dropdown-trigger {
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.nav-arrow {
  font-size: 10px;
  transition: transform var(--transition);
}
.nav-dropdown:hover .nav-arrow,
.nav-dropdown.open .nav-arrow {
  transform: rotate(180deg);
}
.nav-dropdown-menu {
  display: none;
  position: absolute;
  top: calc(100% + 4px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  padding: 4px 0;
  min-width: 160px;
  z-index: 200;
  flex-direction: column;
}
.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.open .nav-dropdown-menu {
  display: flex;
}
.nav-dropdown-menu .nav-link {
  padding: 10px 16px;
  border-radius: 0;
  white-space: nowrap;
  text-align: left;
}
.nav-dropdown-menu .nav-link:first-child {
  border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}
.nav-dropdown-menu .nav-link:last-child {
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.nav-dropdown-menu .nav-link.active {
  background: var(--c-primary-light);
  color: #fff;
}

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.hamburger span {
  width: 24px;
  height: 2px;
  background: var(--c-text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ─── MAIN ─────────────────────────────────────────────────────────── */
.main { flex: 1; padding: 40px 0; }
.hidden { display: none !important; }
.page { display: none; }
.page.active { display: block; animation: fadeIn .3s ease; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── HOME / HERO ──────────────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 40px 0 50px;
}
.hero h1 {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.15;
  margin-bottom: 16px;
}
.accent { color: var(--c-primary); }
.hero-sub {
  font-size: 1.125rem;
  color: var(--c-text-secondary);
  max-width: 580px;
  margin: 0 auto 32px;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }

/* ─── BUTTONS ──────────────────────────────────────────────────────── */
.btn {
  font-family: var(--font);
  font-weight: 600;
  font-size: 14px;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
}
.btn-lg { padding: 14px 28px; font-size: 16px; }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-primary { background: var(--c-primary); color: #fff; }
.btn-primary:hover { background: var(--c-primary-dark); }
.btn-outline { background: transparent; border: 2px solid var(--c-primary); color: var(--c-primary); }
.btn-outline:hover { background: var(--c-primary); color: #fff; }
.btn-ghost { background: transparent; color: var(--c-text-secondary); }
.btn-ghost:hover { background: var(--c-surface-hover); color: var(--c-text); }
.btn-back {
  background: none;
  color: var(--c-accent);
  font-weight: 600;
  padding: 8px 0;
  margin-bottom: 20px;
}
.btn-back:hover { text-decoration: underline; }
.btn-disabled, .btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  pointer-events: none;
}

/* ─── FEATURE CARDS ────────────────────────────────────────────────── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
  margin-bottom: 50px;
}
.feature-card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
}
.feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow);
  border-color: var(--c-primary-light);
}
.feature-icon { font-size: 36px; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--c-text-secondary); }

/* ─── DAILY PHRASE ─────────────────────────────────────────────────── */
.daily-phrase {
  background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
  border: 1px solid #ffe0b2;
  border-radius: var(--radius);
  padding: 28px 32px;
  text-align: center;
}
.daily-phrase h3 { margin-bottom: 14px; font-size: 1rem; color: var(--c-primary-dark); }
.phrase-dutch { font-size: 1.5rem; font-weight: 700; margin-bottom: 6px; color: var(--c-text); }
.phrase-english { font-size: 1.1rem; color: var(--c-text-secondary); font-style: italic; }

/* ─── PAGE TITLES ──────────────────────────────────────────────────── */
.page-title {
  font-size: 2rem;
  font-weight: 800;
  margin-bottom: 8px;
}
.title-nl { color: var(--c-primary); font-weight: 600; font-size: 0.7em; }
.page-desc {
  color: var(--c-text-secondary);
  margin-bottom: 30px;
  font-size: 1rem;
}

/* ─── TABS ─────────────────────────────────────────────────────────── */
.level-tabs, .audience-tabs, .practice-type-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}
.tab {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 22px;
  border: 2px solid var(--c-border);
  border-radius: 999px;
  background: var(--c-surface);
  color: var(--c-text-secondary);
  cursor: pointer;
  transition: var(--transition);
}
.tab:hover { border-color: var(--c-primary-light); color: var(--c-text); }
.tab.active { background: var(--c-primary); color: #fff; border-color: var(--c-primary); }


/* ─── FOOTER ───────────────────────────────────────────────────────── */
.footer {
  background: var(--c-surface);
  border-top: 1px solid var(--c-border);
  padding: 24px 0;
  text-align: center;
}
.footer-inner { font-size: 0.9rem; color: var(--c-text-secondary); }
.footer-source { margin-top: 6px; font-size: 0.8rem; }


/* ─── SPEAK BUTTON (TTS) ──────────────────────────────────────────── */
.btn-speak {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: none;
  border: 1px solid var(--c-border);
  border-radius: 50%;
  width: 28px;
  height: 28px;
  font-size: 14px;
  cursor: pointer;
  padding: 0;
  vertical-align: middle;
  margin-left: 4px;
  transition: background var(--transition), border-color var(--transition);
  line-height: 1;
}
.btn-speak:hover {
  background: var(--c-primary-light);
  border-color: var(--c-primary);
  color: #fff;
}


/* ─── RESPONSIVE ───────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--c-surface);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--c-border);
    box-shadow: var(--shadow);
    gap: 4px;
  }
  .nav.open { display: flex; }
  .nav-link { text-align: left; padding: 12px 16px; }
  /* Flatten dropdowns in mobile nav */
  .nav-dropdown { position: static; }
  .nav-dropdown-trigger {
    font-weight: 700;
    color: var(--c-text);
    text-transform: uppercase;
    font-size: 11px;
    letter-spacing: 1px;
    padding: 12px 16px 4px;
    pointer-events: none;
  }
  .nav-dropdown-trigger .nav-arrow { display: none; }
  .nav-dropdown-trigger.active { background: none; color: var(--c-primary); }
  .nav-dropdown-menu {
    display: flex;
    position: static;
    transform: none;
    border: none;
    box-shadow: none;
    padding: 0;
    min-width: 0;
    background: transparent;
  }
  .nav-dropdown-menu .nav-link { padding-left: 28px; }
  .hero h1 { font-size: 2rem; }
  .hero-sub { font-size: 1rem; }
  .practice-prompt { font-size: 1.25rem; }
  .practice-card { padding: 24px 18px; }
  .practice-settings { flex-direction: column; align-items: flex-start; }
  .story-reader-title { font-size: 1.3rem; }
  .grammar-topic { padding: 20px 16px; }
  .grammar-example { flex-direction: column; align-items: flex-start; }
  .ge-note { margin-left: 0; }
  .verb-tables { grid-template-columns: 1fr; }
  .test-menu { grid-template-columns: 1fr 1fr; }
  .test-question-card { padding: 24px 18px; }
  .test-results-card { padding: 28px 18px; }
  .test-breakdown-label { min-width: 100px; font-size: 0.82rem; }
  .lesson-card { padding: 14px 16px; gap: 12px; }
  .lesson-vocab-grid { grid-template-columns: 1fr 1fr; }
  .memory-board { grid-template-columns: repeat(3, 1fr); }
  .games-menu { grid-template-columns: 1fr 1fr; }
  .progress-stats { grid-template-columns: repeat(2, 1fr); }
  .game-header { flex-wrap: wrap; }
  .dict-alpha-btn { width: 30px; height: 30px; font-size: 0.78rem; }
  .dict-detail-card { padding: 20px; }
  .dd-word { font-size: 1.4rem; }
  .account-progress-grid { grid-template-columns: repeat(2, 1fr); }
  .account-header { flex-wrap: wrap; }
  .nav-link-account { border-left: none; margin-left: 0; padding-left: 8px !important; }
}

@media (max-width: 480px) {
  .hero h1 { font-size: 1.6rem; }
  .features-grid { grid-template-columns: 1fr; }
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .vocab-list { grid-template-columns: 1fr; }
  .stories-list { grid-template-columns: 1fr; }
  .sentence-input-row { flex-direction: column; }
  .sentence-input { min-width: auto; width: 100%; }
  .test-menu { grid-template-columns: 1fr; }
  .lesson-vocab-grid { grid-template-columns: 1fr; }
  .memory-board { grid-template-columns: repeat(3, 1fr); }
  .games-menu { grid-template-columns: 1fr; }
  .progress-stats { grid-template-columns: 1fr 1fr; }
  .scramble-word { font-size: 1.6rem; letter-spacing: 4px; }
  .hangman-display { font-size: 1.5rem; letter-spacing: 5px; }
  .hk-key { width: 30px; height: 30px; font-size: 0.82rem; }
  .lg-example { flex-direction: column; align-items: flex-start; gap: 2px; }
  .ld-line { flex-direction: column; gap: 2px; }
  .dict-search-bar { flex-direction: column; }
  .dict-stat-row { flex-direction: column; gap: 8px; }
  .dict-word-row { flex-direction: column; align-items: flex-start; }
  .dict-alpha-btn { width: 26px; height: 26px; font-size: 0.72rem; }
  .dict-detail-card { padding: 16px; }
  .dd-word { font-size: 1.2rem; }
  .account-progress-grid { grid-template-columns: 1fr 1fr; }
  .account-header { flex-direction: column; text-align: center; }
  .auth-form { max-width: 100%; }
  .auth-tabs { max-width: 100%; }
  .weak-area-label { min-width: 100px; }
}