/* ============================================================
   ENGLISH PROFI — COMPLETE STYLESHEET
   Professional dark theme with teal accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ============================================================
   RESET & ROOT
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

:root {
  --bg:       #0d1117;
  --bg2:      #161b22;
  --bg3:      #1c2330;
  --bg4:      #21262d;
  --bg5:      #2d333b;
  --border:   rgba(255,255,255,0.08);
  --border2:  rgba(255,255,255,0.14);
  --border3:  rgba(255,255,255,0.22);

  --teal:     #2dd4bf;
  --teal2:    #5eead4;
  --teal3:    #99f6e4;
  --teal-bg:  rgba(45,212,191,0.1);
  --teal-bd:  rgba(45,212,191,0.25);

  --blue:     #58a6ff;
  --green:    #3fb950;
  --yellow:   #f0a332;
  --orange:   #f08832;
  --red:      #f85149;
  --purple:   #bc8cff;

  --text:     #e6edf3;
  --text2:    #8b949e;
  --text3:    #484f58;
  --text4:    #6e7681;

  --font:     'Plus Jakarta Sans', sans-serif;
  --mono:     'JetBrains Mono', monospace;

  --r-sm:     6px;
  --r-md:     10px;
  --r-lg:     14px;
  --r-xl:     20px;

  --shadow:   0 4px 24px rgba(0,0,0,0.4);
  --shadow-sm:0 2px 8px rgba(0,0,0,0.3);

  --sidebar:  240px;
  --topbar:   56px;
}

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

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg5); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text3); }

/* ============================================================
   LAYOUT
   ============================================================ */
.app-wrapper { display: flex; min-height: 100vh; }

/* SIDEBAR */
.sidebar {
  width: var(--sidebar);
  min-width: var(--sidebar);
  background: var(--bg2);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; left: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 200;
  transition: transform 0.25s ease;
}

.sidebar-logo {
  padding: 20px 18px 16px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px;
}
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, var(--teal), var(--blue));
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px; font-weight: 800; color: #0d1117; flex-shrink: 0;
  letter-spacing: -1px;
}
.logo-text { font-size: 15px; font-weight: 700; }
.logo-text span { color: var(--teal2); }

/* XP + Level */
.sidebar-xp {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
}
.xp-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 6px; }
.xp-label { font-size: 11px; color: var(--text2); font-weight: 500; text-transform: uppercase; letter-spacing: 0.5px; }
.xp-value { font-size: 12px; font-family: var(--mono); color: var(--teal2); font-weight: 500; }
.xp-track { height: 4px; background: var(--bg5); border-radius: 2px; overflow: hidden; }
.xp-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--teal), var(--blue));
  border-radius: 2px;
  transition: width 0.7s cubic-bezier(0.4,0,0.2,1);
}
.level-chip {
  margin-top: 8px;
  display: inline-flex; align-items: center; gap: 6px;
  background: var(--teal-bg); border: 1px solid var(--teal-bd);
  border-radius: 100px; padding: 3px 10px;
  font-size: 11px; font-weight: 600; color: var(--teal2);
  font-family: var(--mono);
}
.level-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--green); }

/* Nav Sections */
.nav-group { padding: 10px 10px 4px; }
.nav-group-label {
  font-size: 10px; font-weight: 600; color: var(--text3);
  letter-spacing: 1.2px; text-transform: uppercase;
  padding: 0 8px; margin-bottom: 3px; display: block;
}
.nav-item {
  display: flex; align-items: center; gap: 9px;
  padding: 8px 10px; border-radius: var(--r-md);
  cursor: pointer; font-size: 13px; color: var(--text2);
  transition: all 0.12s; margin-bottom: 1px; user-select: none;
}
.nav-item:hover { background: var(--bg3); color: var(--text); }
.nav-item.active { background: var(--teal-bg); color: var(--teal2); border: 1px solid var(--teal-bd); }
.nav-item .nav-icon { font-size: 14px; width: 18px; text-align: center; flex-shrink: 0; }
.nav-item .nav-label { flex: 1; }
.nav-badge {
  font-size: 10px; font-family: var(--mono); font-weight: 600;
  background: var(--teal); color: #0d1117; border-radius: 100px; padding: 1px 6px;
}

/* Streak */
.sidebar-streak {
  margin-top: auto;
  padding: 14px 18px;
  border-top: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px;
}
.streak-fire { font-size: 22px; }
.streak-info { display: flex; flex-direction: column; }
.streak-num { font-size: 18px; font-weight: 700; font-family: var(--mono); color: var(--yellow); line-height: 1; }
.streak-lbl { font-size: 11px; color: var(--text2); }

/* Main */
.main-content {
  margin-left: var(--sidebar);
  flex: 1;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Top Bar */
.topbar {
  height: var(--topbar);
  background: var(--bg2);
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center;
  padding: 0 28px;
  position: sticky; top: 0; z-index: 100;
  gap: 12px;
}
.topbar-title { font-size: 15px; font-weight: 600; flex: 1; }
.topbar-actions { display: flex; gap: 8px; align-items: center; }
.api-key-display {
  font-size: 11px; font-family: var(--mono);
  color: var(--text3); background: var(--bg3);
  border: 1px solid var(--border); border-radius: var(--r-sm);
  padding: 4px 10px; cursor: pointer; transition: all 0.15s;
}
.api-key-display:hover { border-color: var(--teal-bd); color: var(--teal2); }
.api-key-display.set { color: var(--green); border-color: rgba(63,185,80,0.3); }

/* Page Content */
.page-content { padding: 28px 32px; flex: 1; max-width: 1000px; }

/* ============================================================
   PAGES
   ============================================================ */
.page { display: none; }
.page.active { display: block; }

.page-header { margin-bottom: 24px; }
.page-header h1 { font-size: 24px; font-weight: 700; letter-spacing: -0.5px; }
.page-header p { font-size: 14px; color: var(--text2); margin-top: 4px; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--r-xl);
  padding: 20px 22px;
  margin-bottom: 14px;
}
.card-sm { border-radius: var(--r-lg); padding: 14px 16px; }
.card-title {
  font-size: 14px; font-weight: 600;
  margin-bottom: 14px; display: flex; align-items: center; gap: 8px;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 9px 18px; border-radius: var(--r-md);
  font-family: var(--font); font-size: 13px; font-weight: 600;
  cursor: pointer; border: none; transition: all 0.14s;
  text-decoration: none; white-space: nowrap;
}
.btn-teal { background: var(--teal); color: #0d1117; }
.btn-teal:hover { background: var(--teal2); transform: translateY(-1px); }
.btn-ghost {
  background: var(--bg3); color: var(--text2);
  border: 1px solid var(--border2);
}
.btn-ghost:hover { background: var(--bg4); color: var(--text); }
.btn-danger { background: rgba(248,81,73,0.15); color: var(--red); border: 1px solid rgba(248,81,73,0.25); }
.btn-sm { padding: 5px 13px; font-size: 12px; }
.btn-lg { padding: 13px 26px; font-size: 15px; border-radius: var(--r-lg); }
.btn-icon { padding: 8px; border-radius: var(--r-sm); }
.btn:disabled { opacity: 0.45; cursor: not-allowed; pointer-events: none; }

/* ============================================================
   BADGES / TAGS
   ============================================================ */
.tag {
  display: inline-flex; align-items: center;
  padding: 2px 9px; border-radius: 100px;
  font-size: 10px; font-weight: 700;
  font-family: var(--mono); letter-spacing: 0.5px; text-transform: uppercase;
}
.tag-a1 { background: rgba(63,185,80,0.15); color: #5cde5c; }
.tag-a2 { background: rgba(240,163,50,0.15); color: #f4b840; }
.tag-b1 { background: rgba(88,166,255,0.15); color: var(--blue); }
.tag-b2 { background: rgba(188,140,255,0.15); color: var(--purple); }
.tag-c1 { background: rgba(248,81,73,0.15); color: var(--red); }

/* ============================================================
   FORMS
   ============================================================ */
.input {
  width: 100%; padding: 9px 13px;
  background: var(--bg3); border: 1px solid var(--border2);
  border-radius: var(--r-md); color: var(--text);
  font-family: var(--font); font-size: 14px;
  outline: none; transition: border 0.15s;
}
.input:focus { border-color: var(--teal); }
.input::placeholder { color: var(--text3); }
textarea.input { resize: vertical; min-height: 80px; line-height: 1.5; }

/* ============================================================
   TABS
   ============================================================ */
.tabs {
  display: flex; gap: 2px; margin-bottom: 18px;
  border-bottom: 1px solid var(--border);
  overflow-x: auto; scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tab-btn {
  padding: 8px 15px; font-size: 13px; cursor: pointer;
  color: var(--text2); border-bottom: 2px solid transparent;
  margin-bottom: -1px; font-weight: 500; transition: all 0.14s;
  white-space: nowrap; background: none; border-top: none; border-left: none; border-right: none;
  font-family: var(--font);
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active { color: var(--teal2); border-bottom-color: var(--teal); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ============================================================
   GRIDS
   ============================================================ */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }

/* ============================================================
   STAT CARDS
   ============================================================ */
.stat-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 16px 18px;
  display: flex; flex-direction: column; gap: 3px;
}
.stat-val { font-size: 26px; font-weight: 700; font-family: var(--mono); line-height: 1.1; }
.stat-lbl { font-size: 12px; color: var(--text2); }
.stat-teal { color: var(--teal2); }
.stat-green { color: var(--green); }
.stat-yellow { color: var(--yellow); }
.stat-blue { color: var(--blue); }

/* ============================================================
   VOCABULARY FLIP CARDS
   ============================================================ */
.vocab-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(175px, 1fr)); gap: 10px; }
.vocab-card {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 14px;
  cursor: pointer; transition: all 0.15s;
  min-height: 95px; display: flex; flex-direction: column;
  position: relative; user-select: none;
}
.vocab-card:hover { border-color: var(--border2); background: var(--bg4); }
.vocab-card.flipped { border-color: var(--teal); background: rgba(45,212,191,0.06); }
.vocab-card.mastered { border-color: var(--green); background: rgba(63,185,80,0.06); }
.vc-level { position: absolute; top: 10px; right: 10px; }
.vc-en { font-size: 15px; font-weight: 600; line-height: 1.3; margin-top: 2px; }
.vc-ipa { font-size: 11px; font-family: var(--mono); color: var(--text3); margin: 2px 0; }
.vc-de { font-size: 13px; color: var(--teal2); margin-top: 4px; display: none; font-weight: 500; }
.vc-ex { font-size: 11px; color: var(--text2); margin-top: 5px; font-style: italic; display: none; line-height: 1.4; }
.vocab-card.flipped .vc-de,
.vocab-card.flipped .vc-ex,
.vocab-card.mastered .vc-de { display: block; }
.vc-actions { display: flex; gap: 6px; margin-top: 8px; display: none; }
.vocab-card.flipped .vc-actions { display: flex; }
.vc-btn {
  flex: 1; padding: 4px 6px; border-radius: var(--r-sm);
  border: 1px solid var(--border2); background: var(--bg4);
  font-size: 10px; cursor: pointer; color: var(--text2); font-family: var(--font);
  transition: all 0.12s; text-align: center;
}
.vc-btn:hover { color: var(--text); border-color: var(--border3); }
.vc-btn.good:hover { background: rgba(63,185,80,0.15); color: var(--green); border-color: rgba(63,185,80,0.3); }
.vc-btn.speak { color: var(--blue); border-color: rgba(88,166,255,0.25); }

/* ============================================================
   QUIZ
   ============================================================ */
.quiz-progress { display: flex; gap: 4px; margin-bottom: 16px; }
.qp-dot { height: 3px; flex: 1; border-radius: 2px; background: var(--bg5); transition: background 0.3s; }
.qp-dot.done { background: var(--teal); }
.qp-dot.current { background: var(--blue); }
.quiz-q { font-size: 18px; font-weight: 600; line-height: 1.4; margin-bottom: 18px; }
.quiz-options { display: grid; gap: 9px; }
.quiz-opt {
  padding: 12px 16px; border-radius: var(--r-lg);
  border: 1px solid var(--border2); background: var(--bg3);
  cursor: pointer; font-family: var(--font); font-size: 14px;
  color: var(--text); text-align: left; transition: all 0.14s;
  display: flex; align-items: center; gap: 10px;
}
.quiz-opt::before {
  content: attr(data-letter);
  width: 24px; height: 24px;
  border-radius: 50%; border: 1px solid var(--border3);
  display: flex; align-items: center; justify-content: center;
  font-size: 11px; font-weight: 700; flex-shrink: 0;
  font-family: var(--mono); transition: all 0.14s;
}
.quiz-opt:hover:not(:disabled) { border-color: var(--teal-bd); background: var(--teal-bg); }
.quiz-opt:hover:not(:disabled)::before { background: var(--teal-bg); border-color: var(--teal); color: var(--teal2); }
.quiz-opt.correct { border-color: rgba(63,185,80,0.5); background: rgba(63,185,80,0.1); color: #5cde5c; }
.quiz-opt.correct::before { background: rgba(63,185,80,0.2); border-color: var(--green); color: var(--green); }
.quiz-opt.wrong { border-color: rgba(248,81,73,0.4); background: rgba(248,81,73,0.08); color: var(--red); }
.quiz-opt.wrong::before { background: rgba(248,81,73,0.15); border-color: var(--red); color: var(--red); }
.quiz-opt:disabled { cursor: default; }
.quiz-feedback {
  margin-top: 14px; padding: 12px 16px; border-radius: var(--r-lg);
  font-size: 13px; line-height: 1.5; display: none;
}
.quiz-feedback.ok { display: block; background: rgba(63,185,80,0.08); color: #5cde5c; border: 1px solid rgba(63,185,80,0.2); }
.quiz-feedback.no { display: block; background: rgba(248,81,73,0.07); color: var(--red); border: 1px solid rgba(248,81,73,0.2); }
.quiz-result-screen { text-align: center; padding: 40px 20px; }
.qr-emoji { font-size: 52px; margin-bottom: 14px; }
.qr-score { font-size: 42px; font-weight: 800; font-family: var(--mono); color: var(--teal2); }
.qr-label { font-size: 14px; color: var(--text2); margin-bottom: 24px; }

/* ============================================================
   FILL IN THE BLANK
   ============================================================ */
.fill-sentence { font-size: 18px; font-weight: 500; line-height: 1.8; margin-bottom: 16px; }
.fill-blank {
  display: inline-block;
  border-bottom: 2px solid var(--teal);
  min-width: 90px; padding: 0 6px;
  color: var(--teal2); font-weight: 600; text-align: center;
}
.fill-input-wrap { display: flex; gap: 8px; align-items: center; }

/* ============================================================
   SENTENCE BUILDER
   ============================================================ */
.builder-zone {
  min-height: 52px; display: flex; flex-wrap: wrap; gap: 7px;
  padding: 12px 14px; border-radius: var(--r-lg);
  border: 1px dashed var(--border2);
  background: var(--bg3); margin-bottom: 10px;
  align-items: center;
}
.builder-word {
  padding: 5px 13px; border-radius: 100px;
  border: 1px solid var(--border2); background: var(--bg4);
  font-size: 13px; cursor: pointer; transition: all 0.14s; color: var(--text);
}
.builder-word:hover { border-color: var(--teal-bd); background: var(--teal-bg); color: var(--teal2); }
.builder-word.placed { background: var(--teal-bg); border-color: var(--teal); color: var(--teal2); }
.builder-answer { min-height: 52px; display: flex; flex-wrap: wrap; gap: 7px; padding: 12px 14px; border-radius: var(--r-lg); border: 1px solid var(--border2); background: var(--bg); margin-bottom: 12px; align-items: center; }
.builder-answer-word { padding: 5px 13px; border-radius: 100px; background: var(--teal-bg); border: 1px solid var(--teal); color: var(--teal2); font-size: 13px; cursor: pointer; }
.builder-placeholder { font-size: 12px; color: var(--text3); }

/* ============================================================
   PHRASES
   ============================================================ */
.phrase-row {
  display: grid; grid-template-columns: 1fr 1fr auto;
  align-items: center; gap: 12px;
  padding: 11px 0; border-bottom: 1px solid var(--border);
}
.phrase-row:last-child { border-bottom: none; }
.phrase-en { font-weight: 600; font-size: 13px; }
.phrase-de { font-size: 12px; color: var(--text2); }
.phrase-formal { font-size: 10px; color: var(--text3); }
.speak-btn {
  padding: 4px 12px; border-radius: 100px;
  border: 1px solid var(--border2); background: var(--bg3);
  font-size: 11px; color: var(--blue); cursor: pointer;
  font-family: var(--font); transition: all 0.14s; white-space: nowrap;
}
.speak-btn:hover { background: rgba(88,166,255,0.1); border-color: rgba(88,166,255,0.3); }

/* ============================================================
   GRAMMAR
   ============================================================ */
.grammar-section { margin-bottom: 20px; }
.grammar-section .section-label {
  font-size: 11px; font-weight: 700; color: var(--teal2);
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px;
}
.grammar-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.grammar-table th {
  text-align: left; padding: 8px 12px;
  background: var(--bg3); color: var(--text2);
  font-size: 10px; font-weight: 700; letter-spacing: 0.8px;
  text-transform: uppercase; border-bottom: 1px solid var(--border);
}
.grammar-table td { padding: 9px 12px; border-bottom: 1px solid var(--border); vertical-align: top; }
.grammar-table tr:last-child td { border-bottom: none; }
.em { color: var(--teal2); font-family: var(--mono); font-size: 12px; }
.note { color: var(--text2); font-size: 12px; }
.grammar-example { font-style: italic; font-size: 13px; }

.hint-box {
  background: rgba(88,166,255,0.07); border: 1px solid rgba(88,166,255,0.18);
  border-radius: var(--r-md); padding: 10px 14px; font-size: 13px;
  color: #7bb6e8; margin-bottom: 12px; line-height: 1.6;
}
.hint-box strong { color: var(--blue); }
.tip-box {
  background: rgba(45,212,191,0.07); border: 1px solid var(--teal-bd);
  border-radius: var(--r-md); padding: 10px 14px; font-size: 13px;
  color: var(--teal3); margin-bottom: 12px; line-height: 1.6;
}
.tip-box strong { color: var(--teal2); }
.warn-box {
  background: rgba(240,163,50,0.08); border: 1px solid rgba(240,163,50,0.25);
  border-radius: var(--r-md); padding: 10px 14px; font-size: 13px;
  color: #f5c863; margin-bottom: 12px; line-height: 1.6;
}

/* ============================================================
   PRONUNCIATION
   ============================================================ */
.phoneme-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(100px, 1fr)); gap: 8px; }
.phoneme-card {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 10px; text-align: center;
  cursor: pointer; transition: all 0.15s;
}
.phoneme-card:hover { border-color: var(--teal-bd); background: var(--teal-bg); }
.phoneme-card:active { transform: scale(0.97); }
.ph-sym { font-size: 20px; font-family: var(--mono); color: var(--teal2); display: block; }
.ph-word { font-size: 11px; font-weight: 600; margin: 2px 0; }
.ph-desc { font-size: 10px; color: var(--text2); }
.ph-examples { font-size: 10px; color: var(--text3); font-style: italic; }
.mistake-card {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r-lg); padding: 14px 16px; margin-bottom: 10px;
  display: flex; gap: 14px; align-items: flex-start;
}
.mistake-sym { font-size: 18px; font-family: var(--mono); color: var(--yellow); flex-shrink: 0; width: 60px; font-weight: 600; }
.mistake-tip { font-size: 13px; color: var(--text); line-height: 1.5; flex: 1; }
.mistake-tip .tip-note { font-size: 12px; color: var(--text2); margin-top: 4px; }

/* ============================================================
   CONVERSATION / AI CHAT
   ============================================================ */
.chat-container { display: flex; flex-direction: column; height: 480px; }
.chat-messages {
  flex: 1; overflow-y: auto; display: flex;
  flex-direction: column; gap: 12px; padding: 16px;
  background: var(--bg3); border-radius: var(--r-xl) var(--r-xl) 0 0;
  border: 1px solid var(--border); border-bottom: none;
}
.msg-row { display: flex; gap: 8px; align-items: flex-end; }
.msg-row.user { flex-direction: row-reverse; }
.msg-avatar {
  width: 28px; height: 28px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; flex-shrink: 0;
}
.msg-row.ai .msg-avatar { background: var(--teal-bg); color: var(--teal2); border: 1px solid var(--teal-bd); }
.msg-row.user .msg-avatar { background: rgba(88,166,255,0.15); color: var(--blue); border: 1px solid rgba(88,166,255,0.25); }
.msg-bubble {
  max-width: 78%; padding: 9px 13px;
  border-radius: 14px; font-size: 13px; line-height: 1.6;
}
.msg-row.ai .msg-bubble {
  background: var(--bg4); border: 1px solid var(--border);
  color: var(--text); border-bottom-left-radius: 4px;
}
.msg-row.user .msg-bubble {
  background: rgba(88,166,255,0.12); border: 1px solid rgba(88,166,255,0.22);
  color: #93c5fd; border-bottom-right-radius: 4px;
}
.correction-tag {
  margin-top: 7px; padding: 5px 10px;
  background: rgba(240,163,50,0.1); border: 1px solid rgba(240,163,50,0.25);
  border-radius: var(--r-sm); font-size: 11px; color: #f5c863;
  border-left: 2px solid var(--yellow);
}
.typing-indicator { display: flex; align-items: center; gap: 4px; padding: 6px 0; }
.typing-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--text3); animation: typing 1.2s infinite; }
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing { 0%,80%,100%{ transform:translateY(0); opacity:0.4; } 40%{ transform:translateY(-5px); opacity:1; } }
.chat-input-area {
  display: flex; gap: 8px; padding: 12px 14px;
  background: var(--bg4); border: 1px solid var(--border);
  border-radius: 0 0 var(--r-xl) var(--r-xl); align-items: flex-end;
}
.chat-input {
  flex: 1; background: var(--bg3); border: 1px solid var(--border2);
  border-radius: var(--r-lg); padding: 9px 13px; color: var(--text);
  font-family: var(--font); font-size: 13px; outline: none;
  resize: none; min-height: 40px; max-height: 100px;
  transition: border 0.15s; line-height: 1.5;
}
.chat-input:focus { border-color: var(--teal); }

/* Scenario Cards */
.scenario-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 10px; margin-bottom: 20px; }
.scenario-card {
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: var(--r-xl); padding: 16px 14px; cursor: pointer;
  transition: all 0.18s; text-align: center;
}
.scenario-card:hover { border-color: var(--teal-bd); transform: translateY(-2px); background: var(--teal-bg); }
.sc-emoji { font-size: 26px; margin-bottom: 8px; }
.sc-name { font-size: 13px; font-weight: 600; margin-bottom: 3px; }
.sc-desc { font-size: 11px; color: var(--text2); }

/* ============================================================
   CURRICULUM
   ============================================================ */
.curr-level { border: 1px solid var(--border); border-radius: var(--r-xl); overflow: hidden; margin-bottom: 12px; }
.curr-header {
  padding: 14px 18px; background: var(--bg3);
  display: flex; align-items: center; gap: 12px; cursor: pointer;
  transition: background 0.15s;
}
.curr-header:hover { background: var(--bg4); }
.curr-title { font-weight: 600; font-size: 14px; }
.curr-info { font-size: 12px; color: var(--text2); }
.curr-toggle { margin-left: auto; font-size: 11px; color: var(--text3); transition: transform 0.2s; }
.curr-toggle.open { transform: rotate(180deg); }
.curr-body { display: none; background: var(--bg2); }
.curr-body.open { display: block; }
.curr-topic {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 18px; border-bottom: 1px solid var(--border);
  font-size: 13px; color: var(--text2); cursor: pointer; transition: all 0.13s;
}
.curr-topic:last-child { border-bottom: none; }
.curr-topic:hover { color: var(--text); background: var(--bg3); }
.curr-topic.done { color: var(--green); }
.topic-check {
  width: 18px; height: 18px; border-radius: 50%;
  border: 1px solid var(--border2);
  display: flex; align-items: center; justify-content: center;
  font-size: 9px; flex-shrink: 0; transition: all 0.15s;
}
.curr-topic.done .topic-check { background: var(--green); border-color: var(--green); color: #fff; }

/* ============================================================
   WRITING
   ============================================================ */
.writing-prompt { font-size: 15px; font-weight: 500; line-height: 1.6; margin-bottom: 8px; }
.writing-meta { display: flex; gap: 8px; align-items: center; margin-bottom: 14px; }
.word-count { font-size: 12px; font-family: var(--mono); color: var(--text3); }
.writing-textarea {
  width: 100%; min-height: 180px; padding: 14px;
  background: var(--bg3); border: 1px solid var(--border2);
  border-radius: var(--r-lg); color: var(--text);
  font-family: var(--font); font-size: 14px; line-height: 1.7;
  outline: none; resize: vertical; transition: border 0.15s;
}
.writing-textarea:focus { border-color: var(--teal); }
.ai-feedback {
  margin-top: 14px; padding: 16px;
  background: rgba(45,212,191,0.06); border: 1px solid var(--teal-bd);
  border-radius: var(--r-lg); font-size: 13px; line-height: 1.7;
  display: none;
}
.ai-feedback.show { display: block; }
.feedback-loading { display: flex; align-items: center; gap: 10px; color: var(--teal2); font-size: 13px; }

/* ============================================================
   DAILY CHALLENGE BANNER
   ============================================================ */
.challenge-banner {
  background: linear-gradient(135deg, rgba(45,212,191,0.1), rgba(88,166,255,0.1));
  border: 1px solid rgba(45,212,191,0.2);
  border-radius: var(--r-xl); padding: 18px 22px;
  display: flex; align-items: center; gap: 16px; margin-bottom: 20px;
}
.cb-emoji { font-size: 30px; }
.cb-text h3 { font-size: 15px; font-weight: 600; margin-bottom: 2px; }
.cb-text p { font-size: 12px; color: var(--text2); max-width: 400px; }
.cb-action { margin-left: auto; flex-shrink: 0; }

/* ============================================================
   PROGRESS / STATS
   ============================================================ */
.progress-track {
  height: 8px; background: var(--bg5); border-radius: 4px; overflow: hidden;
}
.progress-fill {
  height: 100%; border-radius: 4px;
  background: linear-gradient(90deg, var(--teal), var(--blue));
  transition: width 0.6s ease;
}

/* ============================================================
   TOAST NOTIFICATION
   ============================================================ */
.toast {
  position: fixed; bottom: 24px; right: 24px;
  background: var(--bg4); border: 1px solid var(--border2);
  border-radius: var(--r-lg); padding: 11px 18px;
  font-size: 13px; color: var(--text); z-index: 999;
  transform: translateY(80px); opacity: 0; transition: all 0.3s;
  display: flex; align-items: center; gap: 10px; box-shadow: var(--shadow);
  max-width: 320px;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-icon { font-size: 16px; flex-shrink: 0; }
.toast-msg { flex: 1; }

/* ============================================================
   MODAL
   ============================================================ */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.6);
  display: flex; align-items: center; justify-content: center;
  z-index: 500; opacity: 0; pointer-events: none; transition: opacity 0.2s;
}
.modal-overlay.open { opacity: 1; pointer-events: all; }
.modal {
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--r-xl); padding: 24px; width: 460px; max-width: 95vw;
  transform: translateY(20px); transition: transform 0.2s;
}
.modal-overlay.open .modal { transform: translateY(0); }
.modal-title { font-size: 17px; font-weight: 700; margin-bottom: 16px; }

/* ============================================================
   WORD OF DAY
   ============================================================ */
.wod-word { font-size: 28px; font-weight: 800; letter-spacing: -1px; }
.wod-ipa { font-family: var(--mono); color: var(--teal2); font-size: 14px; }
.wod-de { font-size: 15px; color: var(--text2); margin: 6px 0; }
.wod-ex { font-size: 14px; color: var(--text3); font-style: italic; }

/* ============================================================
   FLASHCARD MODE
   ============================================================ */
.flashcard-single {
  background: var(--bg3); border: 1px solid var(--border2);
  border-radius: var(--r-xl); padding: 40px 30px; text-align: center;
  cursor: pointer; min-height: 220px; display: flex;
  flex-direction: column; align-items: center; justify-content: center;
  transition: all 0.2s; position: relative; margin-bottom: 14px;
}
.flashcard-single:hover { border-color: var(--teal-bd); }
.fc-count { position: absolute; top: 16px; right: 16px; font-size: 12px; font-family: var(--mono); color: var(--text3); }
.fc-tag { position: absolute; top: 16px; left: 16px; }
.fc-word { font-size: 30px; font-weight: 800; letter-spacing: -1px; margin-bottom: 6px; }
.fc-ipa { font-family: var(--mono); font-size: 14px; color: var(--text3); }
.fc-hint { font-size: 12px; color: var(--text3); margin-top: 10px; }
.fc-reveal { display: none; }
.flashcard-single.revealed .fc-reveal { display: block; }
.fc-de { font-size: 22px; font-weight: 600; color: var(--teal2); margin-top: 14px; }
.fc-ex { font-size: 13px; color: var(--text2); font-style: italic; margin-top: 8px; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 800px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .page-content { padding: 16px 16px; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
  .grid-3 { grid-template-columns: 1fr 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .hamburger { display: flex; }
}
.hamburger {
  display: none; flex-direction: column; gap: 4px; cursor: pointer; padding: 6px;
}
.hamburger span { width: 20px; height: 2px; background: var(--text); border-radius: 1px; }
.mobile-overlay {
  display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 150;
}
.mobile-overlay.open { display: block; }

/* ============================================================
   LOADING / SKELETON
   ============================================================ */
.skeleton { background: var(--bg4); border-radius: var(--r-sm); animation: skeleton 1.5s infinite; }
@keyframes skeleton { 0%,100%{ opacity:1; } 50%{ opacity:0.5; } }
.loading-spinner {
  width: 22px; height: 22px; border: 2px solid var(--bg5);
  border-top-color: var(--teal); border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   MISC
   ============================================================ */
.divider { height: 1px; background: var(--border); margin: 16px 0; }
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }
.text-muted { color: var(--text2); }
.text-teal { color: var(--teal2); }
.text-green { color: var(--green); }
.text-red { color: var(--red); }
.mono { font-family: var(--mono); }
strong { font-weight: 600; }