/* English Progression Simulator — app styles.
   Dark-first design; honors Telegram theme vars when inside Mini App. */

:root {
  --bg: #0f1115;
  --bg2: #171a21;
  --card: #1e222c;
  --card2: #262b38;
  --text: #e8eaf0;
  --muted: #8d94a7;
  --accent: #1a73e8;
  --accent2: #4ea1ff;
  --ok: #2fbf71;
  --warn: #f2b134;
  --err: #e5534b;
  --bubble-user: #2b64c9;
  --bubble-char: #232836;
  --radius: 14px;
  --nav-h: 60px;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f2f4f9; --bg2: #ffffff; --card: #ffffff; --card2: #eef1f7;
    --text: #1b2130; --muted: #68718a; --bubble-char: #e9edf5;
  }
}

/* Telegram theme overrides */
body.tg {
  --bg: var(--tg-theme-bg-color, var(--bg));
  --bg2: var(--tg-theme-secondary-bg-color, var(--bg2));
  --card: var(--tg-theme-secondary-bg-color, var(--card));
  --text: var(--tg-theme-text-color, var(--text));
  --muted: var(--tg-theme-hint-color, var(--muted));
  --accent: var(--tg-theme-button-color, var(--accent));
  --bubble-user: var(--tg-theme-button-color, var(--bubble-user));
}

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html, body { margin: 0; padding: 0; height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 16px;
  overscroll-behavior: none;
}

.hidden { display: none !important; }
.muted { color: var(--muted); }
.error-text { color: var(--err); font-size: 14px; min-height: 20px; margin-top: 8px; }
.row { display: flex; align-items: center; }
.gap { gap: 8px; }
.flex1 { flex: 1; }
.badge { background: var(--err); color: #fff; border-radius: 10px; font-size: 12px; padding: 0 6px; margin-left: 4px; }
.section-title { margin: 20px 4px 10px; font-size: 15px; color: var(--muted); text-transform: uppercase; letter-spacing: .5px; }

/* ---------- views ---------- */
.view { display: none; padding: 14px 14px calc(var(--nav-h) + 24px); max-width: 720px; margin: 0 auto; }
.view.active { display: block; }

#view-auth { display: none; min-height: 100vh; align-items: center; justify-content: center; }
#view-auth.active { display: flex; }

/* ---------- auth ---------- */
.auth-box { width: 100%; max-width: 380px; text-align: center; padding: 20px; }
.auth-box .logo { font-size: 56px; margin-bottom: 8px; }
.auth-box h1 { font-size: 24px; margin: 0 0 4px; }
.auth-box input { width: 100%; margin-top: 10px; }

.tabs { display: flex; background: var(--card); border-radius: 12px; padding: 4px; margin-top: 22px; }
.tab { flex: 1; border: 0; background: transparent; color: var(--muted); padding: 10px; border-radius: 9px; font-size: 15px; cursor: pointer; }
.tab.active { background: var(--card2); color: var(--text); }

/* ---------- common ---------- */
input, textarea, select {
  background: var(--card);
  border: 1px solid var(--card2);
  color: var(--text);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 16px;
  outline: none;
}
input:focus, textarea:focus, select:focus { border-color: var(--accent); }

.btn {
  background: var(--card2);
  color: var(--text);
  border: 0;
  border-radius: 10px;
  padding: 12px 16px;
  font-size: 15px;
  cursor: pointer;
  transition: opacity .15s;
}
.btn:active { opacity: .75; }
.btn.primary { background: var(--accent); color: #fff; }
.btn.block { display: block; width: 100%; margin-top: 10px; }
.btn.link { background: transparent; color: var(--accent2); }
.btn.small { font-size: 13px; padding: 6px 10px; }
.btn.icon { padding: 12px 14px; font-size: 18px; }
.btn:disabled { opacity: .45; cursor: default; }

.card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px;
  margin-bottom: 12px;
}
.card.hero { background: linear-gradient(135deg, var(--accent) 0%, #7b5cff 120%); color: #fff; }
.card.hero .muted { color: rgba(255,255,255,.75); }
.card.hero h2 { margin: 0 0 4px; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 14px; }
.stat { background: rgba(255,255,255,.12); border-radius: 10px; padding: 10px; text-align: center; }
.stat .num { font-size: 20px; font-weight: 700; }
.stat .lbl { font-size: 11px; opacity: .8; }

.list { display: flex; flex-direction: column; gap: 10px; }

.list-item {
  background: var(--card);
  border-radius: var(--radius);
  padding: 14px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  cursor: pointer;
}
.list-item:active { opacity: .8; }
.list-item .grow { flex: 1; min-width: 0; }
.list-item .title { font-weight: 600; }
.list-item .sub { font-size: 13px; color: var(--muted); margin-top: 2px; }
.list-item .right { text-align: right; color: var(--muted); font-size: 12px; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.chip {
  background: var(--card);
  color: var(--text);
  border: 1px solid var(--card2);
  border-radius: 20px;
  padding: 8px 14px;
  font-size: 14px;
  cursor: pointer;
}
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.level-badge {
  background: var(--card2);
  padding: 4px 10px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 13px;
  color: var(--accent2);
}

/* ---------- topbar/nav ---------- */
#topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 16px calc(12px + env(safe-area-inset-top, 0px));
  background: var(--bg2);
  border-bottom: 1px solid var(--card2);
}
#topbar-title { font-weight: 700; font-size: 17px; }

#bottomnav {
  position: fixed; bottom: 0; left: 0; right: 0; z-index: 20;
  display: flex;
  height: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px));
  padding-bottom: env(safe-area-inset-bottom, 0px);
  background: var(--bg2);
  border-top: 1px solid var(--card2);
}
.navbtn {
  flex: 1; border: 0; background: transparent; color: var(--muted);
  font-size: 20px; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px;
}
.navbtn span { font-size: 11px; }
.navbtn.active { color: var(--accent2); }

/* ---------- chat ---------- */
.chat-view { padding-bottom: 10px; }
.stagebar {
  display: flex; gap: 6px; padding: 4px 0 12px; overflow-x: auto;
}
.stage-dot {
  min-width: 10px; height: 10px; border-radius: 50%;
  background: var(--card2);
}
.stage-dot.done { background: var(--ok); }
.stage-dot.current { background: var(--warn); }

.messages { display: flex; flex-direction: column; gap: 10px; padding: 4px 0 16px; }
.msg { max-width: 82%; padding: 12px 14px; border-radius: 16px; line-height: 1.4; animation: pop .15s ease-out; }
@keyframes pop { from { transform: scale(.96); opacity: 0; } }
.msg.user { align-self: flex-end; background: var(--bubble-user); color: #fff; border-bottom-right-radius: 4px; }
.msg.character { align-self: flex-start; background: var(--bubble-char); border-bottom-left-radius: 4px; }
.msg.system { align-self: center; background: transparent; color: var(--muted); font-size: 13px; text-align: center; }
.msg .ru { margin-top: 6px; font-size: 13px; opacity: .65; border-top: 1px dashed rgba(128,128,128,.3); padding-top: 6px; }
.msg .msg-actions { margin-top: 6px; display: flex; gap: 10px; }
.msg .msg-actions button { background: none; border: 0; color: var(--accent2); font-size: 13px; cursor: pointer; padding: 0; }

#composer {
  position: sticky; bottom: calc(var(--nav-h) + env(safe-area-inset-bottom, 0px));
  background: var(--bg);
  padding: 8px 0 4px;
}
#chat-input { flex: 1; }
.hint { font-size: 13px; color: var(--muted); padding: 6px 2px; }

/* phrase builder */
.builder-answer {
  min-height: 48px; background: var(--card); border: 1px dashed var(--card2);
  border-radius: 10px; padding: 8px; display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 8px;
}
.builder-bank { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }
.word-chip {
  background: var(--card2); border-radius: 8px; padding: 8px 12px;
  font-size: 15px; cursor: pointer; border: 1px solid transparent;
}
.word-chip.in-answer { background: var(--accent); color: #fff; }
.word-chip.wrong { border-color: var(--err); }
.builder-answer .word-chip { background: var(--accent); color: #fff; }
.feedback { min-height: 20px; font-size: 14px; margin-top: 6px; }
.feedback.ok { color: var(--ok); }
.feedback.err { color: var(--err); }

.recording { color: var(--err) !important; animation: pulse 1s infinite; }
@keyframes pulse { 50% { opacity: .5; } }

/* ---------- evaluation ---------- */
.score-ring {
  width: 120px; height: 120px; border-radius: 50%; margin: 10px auto;
  display: flex; align-items: center; justify-content: center;
  font-size: 30px; font-weight: 800;
  background: conic-gradient(var(--accent) calc(var(--p)*1%), var(--card2) 0);
}
.score-ring::before {
  content: ""; position: absolute; width: 92px; height: 92px; border-radius: 50%; background: var(--card);
}
.score-ring span { position: relative; }
.eval-section { margin-top: 16px; }
.eval-item { background: var(--card); border-radius: 10px; padding: 12px; margin-bottom: 8px; font-size: 14px; }
.eval-item .user-text { color: var(--err); text-decoration: line-through; }
.eval-item .fixed { color: var(--ok); }
.eval-item .expl { color: var(--muted); font-size: 13px; margin-top: 4px; }

/* ---------- toast/offline ---------- */
.toast {
  position: fixed; left: 50%; transform: translateX(-50%);
  bottom: calc(var(--nav-h) + 20px); z-index: 50;
  background: var(--card2); color: var(--text);
  padding: 12px 20px; border-radius: 12px; font-size: 14px;
  box-shadow: 0 6px 24px rgba(0,0,0,.35);
}
.offline {
  position: fixed; top: 0; left: 0; right: 0; z-index: 60;
  background: var(--err); color: #fff; text-align: center;
  font-size: 13px; padding: 4px;
}

/* flashcards */
.flashcard { text-align: center; padding: 40px 20px; }
.flashcard .word { font-size: 30px; font-weight: 700; }
.flashcard .translation { font-size: 20px; color: var(--muted); margin-top: 14px; }
.quality-btns { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin-top: 24px; }