/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #0d0a1a;
  --bg2: #130f24;
  --bg3: #1a1430;
  --card: #1e1735;
  --card2: #251d3f;
  --border: rgba(139, 92, 246, 0.2);
  --border2: rgba(139, 92, 246, 0.4);
  --purple: #8b5cf6;
  --purple2: #7c3aed;
  --purple3: #a78bfa;
  --purple-light: rgba(139, 92, 246, 0.15);
  --purple-glow: rgba(139, 92, 246, 0.3);
  --text: #f1f0f7;
  --text2: #b8b0d4;
  --text3: #7a6fa0;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0,0,0,0.4);
  --shadow-purple: 0 8px 32px rgba(139, 92, 246, 0.2);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
}

/* ===== BACKGROUND GLOW ===== */
body::before {
  content: '';
  position: fixed;
  top: -200px; left: -200px;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(139,92,246,0.12) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}
body::after {
  content: '';
  position: fixed;
  bottom: -200px; right: -200px;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(124,58,237,0.1) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ===== NAVBAR ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px;
  height: 64px;
  background: rgba(13, 10, 26, 0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-logo {
  display: flex; align-items: center; gap: 10px;
  font-size: 1.2rem; font-weight: 700;
  color: var(--purple3);
}
.nav-logo i { font-size: 1.4rem; color: var(--purple); }

.nav-links { display: flex; gap: 4px; }

.nav-link {
  padding: 8px 16px;
  border-radius: 8px;
  color: var(--text2);
  text-decoration: none;
  font-size: 0.9rem; font-weight: 500;
  transition: all 0.2s;
  cursor: pointer;
}
.nav-link:hover { color: var(--text); background: var(--purple-light); }
.nav-link.active { color: var(--purple3); background: var(--purple-light); }

.nav-avatar { color: var(--text3); font-size: 1.6rem; cursor: pointer; transition: color 0.2s; }
.nav-avatar:hover { color: var(--purple3); }

.nav-right { display: flex; align-items: center; gap: 12px; }

/* BURGER */
.burger-btn {
  display: none;
  flex-direction: column; justify-content: center; align-items: center;
  gap: 5px;
  width: 36px; height: 36px;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  padding: 6px;
}
.burger-btn span {
  display: block;
  width: 18px; height: 2px;
  background: var(--text2);
  border-radius: 2px;
  transition: all 0.3s;
}
.burger-btn.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.burger-btn.open span:nth-child(2) { opacity: 0; }
.burger-btn.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* MOBILE MENU */
.mobile-menu {
  display: none;
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: rgba(13, 10, 26, 0.98);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  flex-direction: column;
  z-index: 99;
  padding: 8px 0;
}
.mobile-menu.open { display: flex; }
.mobile-link {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 24px;
  color: var(--text2);
  text-decoration: none;
  font-size: 1rem; font-weight: 500;
  transition: all 0.2s;
  border-left: 3px solid transparent;
}
.mobile-link i { color: var(--text3); width: 18px; }
.mobile-link:hover, .mobile-link.active {
  color: var(--purple3);
  background: var(--purple-light);
  border-left-color: var(--purple);
}
.mobile-link.active i { color: var(--purple3); }

/* ===== MAIN ===== */
.main {
  position: relative; z-index: 1;
  padding: 80px 32px 40px;
  max-width: 1200px;
  margin: 0 auto;
}

/* ===== SECTIONS ===== */
.section { display: none; animation: fadeIn 0.4s ease; }
.section.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section-header {
  text-align: center;
  margin-bottom: 40px;
}
.section-header h2 {
  font-size: 2rem; font-weight: 700;
  margin-bottom: 8px;
}
.section-header h2 i { color: var(--purple); margin-right: 10px; }
.section-header p { color: var(--text2); font-size: 1rem; }

/* ===== HERO ===== */
.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
  padding: 60px 0 40px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: var(--purple-light);
  border: 1px solid var(--border2);
  border-radius: 100px;
  font-size: 0.85rem;
  color: var(--purple3);
  margin-bottom: 20px;
}

.hero-text h1 {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 16px;
}

.gradient-text {
  background: linear-gradient(135deg, #a78bfa, #7c3aed, #c084fc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-text p {
  color: var(--text2);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.hero-btns { display: flex; gap: 12px; flex-wrap: wrap; }

.btn-primary {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: linear-gradient(135deg, var(--purple), var(--purple2));
  color: #fff;
  border: none; border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  box-shadow: var(--shadow-purple);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(139,92,246,0.4); }

.btn-secondary {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 24px;
  background: transparent;
  color: var(--purple3);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  font-size: 0.95rem; font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-secondary:hover { background: var(--purple-light); transform: translateY(-2px); }

/* HERO VISUAL */
.hero-visual {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.hero-card {
  display: flex; align-items: center; gap: 12px;
  padding: 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s;
}
.hero-card:hover { border-color: var(--border2); transform: translateY(-4px); box-shadow: var(--shadow-purple); }

.card-icon {
  width: 44px; height: 44px;
  background: var(--purple-light);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: var(--purple3);
  flex-shrink: 0;
}

.card-info { display: flex; flex-direction: column; }
.card-title { font-size: 0.9rem; font-weight: 600; }
.card-sub { font-size: 0.75rem; color: var(--text3); }

/* FLOATING ANIMATION */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.floating { animation: float 4s ease-in-out infinite; }
.delay-1 { animation-delay: 0.5s; }
.delay-2 { animation-delay: 1s; }
.delay-3 { animation-delay: 1.5s; }

/* STATS */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  margin-top: 40px;
}

.stat-card {
  display: flex; flex-direction: column; align-items: center;
  padding: 24px 16px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
  transition: all 0.2s;
}
.stat-card:hover { border-color: var(--border2); box-shadow: var(--shadow-purple); }

.stat-num {
  font-size: 2rem; font-weight: 700;
  background: linear-gradient(135deg, #a78bfa, #7c3aed);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.85rem; color: var(--text2); margin-top: 4px; }

/* ===== TRANSLATOR ===== */
.translator-box {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.translator-top {
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
  background: var(--card2);
}

.lang-selector {
  display: flex; align-items: center; gap: 12px;
}

.lang-btn {
  padding: 8px 20px;
  background: transparent;
  color: var(--text2);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.9rem; font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.lang-btn.active {
  background: var(--purple-light);
  border-color: var(--border2);
  color: var(--purple3);
}
.lang-btn:hover { border-color: var(--border2); color: var(--text); }

.swap-btn {
  width: 36px; height: 36px;
  background: var(--purple-light);
  border: 1px solid var(--border2);
  border-radius: 8px;
  color: var(--purple3);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
  font-size: 0.9rem;
}
.swap-btn:hover { background: var(--purple); color: #fff; transform: rotate(180deg); }

.translator-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.trans-panel {
  padding: 20px;
  display: flex; flex-direction: column;
}
.trans-panel:first-child { border-right: 1px solid var(--border); }

.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 12px;
  font-size: 0.85rem; color: var(--text2); font-weight: 500;
}

.icon-btn {
  background: transparent;
  border: none;
  color: var(--text3);
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 6px;
  transition: all 0.2s;
  font-size: 0.9rem;
}
.icon-btn:hover { color: var(--purple3); background: var(--purple-light); }

textarea#source-text {
  flex: 1;
  min-height: 160px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  resize: none;
}
textarea#source-text::placeholder { color: var(--text3); }

.translation-output {
  flex: 1;
  min-height: 160px;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--purple3);
  white-space: pre-wrap;
}
.translation-output.placeholder { color: var(--text3); font-style: italic; }

.panel-footer {
  display: flex; align-items: center; justify-content: space-between;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

#char-count { font-size: 0.8rem; color: var(--text3); }

.btn-small {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 14px;
  background: var(--purple-light);
  border: 1px solid var(--border2);
  border-radius: 6px;
  color: var(--purple3);
  font-size: 0.8rem; font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-small:hover { background: var(--purple); color: #fff; }

.quick-phrases {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap;
  padding: 16px 20px;
  border-top: 1px solid var(--border);
  background: var(--card2);
}

.phrases-label { font-size: 0.8rem; color: var(--text3); white-space: nowrap; }

.phrase-chip {
  padding: 5px 12px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text2);
  font-size: 0.8rem;
  cursor: pointer;
  transition: all 0.2s;
}
.phrase-chip:hover { border-color: var(--border2); color: var(--purple3); background: var(--purple-light); }

/* ===== TRAINING MODES ===== */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.mode-card {
  display: flex; align-items: center; gap: 16px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.25s;
}
.mode-card:hover {
  border-color: var(--border2);
  transform: translateY(-3px);
  box-shadow: var(--shadow-purple);
}

.mode-icon {
  width: 52px; height: 52px;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: #fff;
  flex-shrink: 0;
}

.mode-info { flex: 1; }
.mode-info h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.mode-info p { font-size: 0.82rem; color: var(--text2); line-height: 1.4; margin-bottom: 8px; }

.mode-tags { display: flex; gap: 6px; }
.tag {
  padding: 2px 8px;
  background: var(--purple-light);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.72rem;
  color: var(--purple3);
}

.mode-arrow { color: var(--text3); transition: all 0.2s; }
.mode-card:hover .mode-arrow { color: var(--purple3); transform: translateX(4px); }

/* ===== LESSONS ===== */
.lessons-grid { display: flex; flex-direction: column; gap: 12px; }

.lesson-card {
  display: flex; align-items: center; gap: 20px;
  padding: 20px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.2s;
}
.lesson-card:hover { border-color: var(--border2); box-shadow: var(--shadow-purple); }

.lesson-num {
  font-size: 1.8rem; font-weight: 700;
  color: var(--border2);
  min-width: 48px;
}

.lesson-info { flex: 1; }
.lesson-info h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.lesson-info p { font-size: 0.85rem; color: var(--text2); margin-bottom: 10px; }

.lesson-progress {
  height: 4px;
  background: var(--bg3);
  border-radius: 100px;
  overflow: hidden;
  margin-bottom: 4px;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--purple), var(--purple3));
  border-radius: 100px;
  transition: width 0.5s ease;
}
.progress-text { font-size: 0.75rem; color: var(--text3); }

.lesson-badge {
  width: 36px; height: 36px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem; font-weight: 600;
  flex-shrink: 0;
}
.lesson-badge.done { background: rgba(16,185,129,0.15); color: #10b981; }
.lesson-badge.progress { background: var(--purple-light); color: var(--purple3); }
.lesson-badge.locked { background: var(--bg3); color: var(--text3); }

/* ===== MODAL ===== */
.modal-overlay {
  display: none;
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.7);
  backdrop-filter: blur(8px);
  z-index: 200;
  align-items: center; justify-content: center;
}
.modal-overlay.open { display: flex; }

.modal {
  position: relative;
  background: var(--card);
  border: 1px solid var(--border2);
  border-radius: 20px;
  padding: 32px;
  max-width: 600px;
  width: 90%;
  max-height: 80vh;
  overflow-y: auto;
  box-shadow: 0 24px 80px rgba(0,0,0,0.6);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from { opacity: 0; transform: scale(0.9) translateY(20px); }
  to   { opacity: 1; transform: scale(1) translateY(0); }
}

.modal-close {
  position: absolute; top: 16px; right: 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text2);
  width: 32px; height: 32px;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: all 0.2s;
}
.modal-close:hover { background: var(--purple-light); color: var(--purple3); }

/* MODAL CONTENT */
.modal-mode-header {
  display: flex; align-items: center; gap: 16px;
  margin-bottom: 24px;
}
.modal-mode-icon {
  width: 56px; height: 56px;
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.6rem; color: #fff;
}
.modal-mode-title h2 { font-size: 1.4rem; font-weight: 700; }
.modal-mode-title p { color: var(--text2); font-size: 0.9rem; }

.phrase-list { display: flex; flex-direction: column; gap: 10px; margin-bottom: 24px; }

.phrase-item {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.phrase-item:hover { border-color: var(--border2); }

.phrase-en { font-size: 1rem; font-weight: 500; color: var(--purple3); }
.phrase-uk { font-size: 0.85rem; color: var(--text2); margin-top: 2px; }
.phrase-texts { display: flex; flex-direction: column; }

.phrase-speak {
  background: transparent; border: none;
  color: var(--text3); cursor: pointer;
  padding: 6px; border-radius: 6px;
  transition: all 0.2s; font-size: 1rem;
}
.phrase-speak:hover { color: var(--purple3); background: var(--purple-light); }

.phrase-num {
  min-width: 24px; height: 24px;
  background: var(--purple-light);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.72rem; font-weight: 600;
  color: var(--purple3);
  flex-shrink: 0;
}

.quiz-option {
  width: 100%;
  padding: 14px 16px;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  transition: all 0.2s;
}
.quiz-option:hover:not(:disabled) { border-color: var(--border2); background: var(--purple-light); color: var(--purple3); }

.modal-quiz-btn {
  width: 100%;
  padding: 14px;
  background: linear-gradient(135deg, var(--purple), var(--purple2));
  border: none; border-radius: var(--radius-sm);
  color: #fff; font-size: 1rem; font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.modal-quiz-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-purple); }

/* ===== TOAST ===== */
.toast {
  position: fixed; bottom: 32px; right: 32px;
  padding: 12px 20px;
  background: var(--card2);
  border: 1px solid var(--border2);
  border-radius: var(--radius-sm);
  color: var(--text);
  font-size: 0.9rem;
  z-index: 300;
  opacity: 0;
  transform: translateY(16px);
  transition: all 0.3s;
  pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--purple); }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; }
  .hero-text h1 { font-size: 2rem; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .modes-grid { grid-template-columns: 1fr; }
  .translator-panels { grid-template-columns: 1fr; }
  .trans-panel:first-child { border-right: none; border-bottom: 1px solid var(--border); }
}

@media (max-width: 768px) {
  .nav-links { display: none; }
  .burger-btn { display: flex; }
}

@media (max-width: 600px) {
  .main { padding: 80px 16px 40px; }
  .navbar { padding: 0 16px; }
  .hero-visual { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .hero-text h1 { font-size: 1.7rem; }
  .modal { padding: 20px 16px; }
  .lang-btn { padding: 8px 12px; font-size: 0.8rem; }
  .quick-phrases { gap: 6px; }
}

/* ===== CONNECTORS ===== */
.connector-group {
  margin-bottom: 32px;
}

.connector-group-header {
  display: flex; align-items: center; gap: 12px;
  margin-bottom: 16px;
}

.connector-group-icon {
  width: 36px; height: 36px;
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}

.connector-group-title {
  font-size: 1.1rem; font-weight: 600;
  flex: 1;
}

.connector-count {
  font-size: 0.78rem;
  color: var(--text3);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 2px 10px;
}

.connector-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 10px;
}

.connector-card {
  position: relative;
  padding: 14px 40px 14px 14px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: all 0.2s;
}
.connector-card:hover {
  border-color: var(--border2);
  box-shadow: var(--shadow-purple);
}

.connector-en {
  font-size: 1rem; font-weight: 600;
  color: var(--purple3);
  margin-bottom: 4px;
}

.connector-uk {
  font-size: 0.82rem;
  color: var(--text2);
  line-height: 1.4;
}

.connector-speak {
  position: absolute;
  top: 10px; right: 10px;
}

@media (max-width: 600px) {
  .connector-grid { grid-template-columns: 1fr 1fr; }
}