:root {
  --bg: #eef2fb;
  --card: #ffffff;
  --primary: #2e5aac;
  --primary-dark: #1f3f80;
  --text: #1b2233;
  --muted: #6b7385;
  --green: #2fae66;
  --orange: #e0a232;
  --red: #d9534f;
  color-scheme: light;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

#app {
  max-width: 480px;
  margin: 0 auto;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  padding: 16px 16px calc(16px + env(safe-area-inset-bottom));
}

.screen { display: none; flex: 1; flex-direction: column; }
.screen.active { display: flex; }

h1 { font-size: 22px; margin: 8px 0 20px; text-align: center; }

/* ---- логин ---- */
#login-screen { justify-content: center; gap: 14px; }
#login-screen input {
  padding: 14px 16px; font-size: 17px; border-radius: 12px; border: 1px solid #d3d9ea;
}
.error-msg { color: var(--red); font-size: 14px; min-height: 18px; text-align: center; }

/* ---- кнопки ---- */
button {
  font-size: 16px; font-weight: 600; border: none; border-radius: 14px;
  padding: 15px 18px; cursor: pointer; -webkit-tap-highlight-color: transparent;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:active { background: var(--primary-dark); }
.btn-secondary { background: #fff; color: var(--primary); border: 1px solid #d3d9ea; }
.btn-row { display: flex; gap: 10px; margin-top: 12px; }
.btn-row button { flex: 1; }

/* ---- главный экран ---- */
.progress-card {
  background: var(--card); border-radius: 18px; padding: 20px; text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06); margin-bottom: 14px;
}
.progress-big { font-size: 40px; font-weight: 700; color: var(--primary); }
.progress-sub { color: var(--muted); font-size: 14px; margin-top: 4px; }

.stats-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 20px; }
.stat-box { background: var(--card); border-radius: 14px; padding: 14px 8px; text-align: center; box-shadow: 0 1px 3px rgba(0,0,0,0.06); }
.stat-box .n { font-size: 22px; font-weight: 700; }
.stat-box .l { font-size: 12px; color: var(--muted); margin-top: 2px; }
.stat-box.known .n { color: var(--green); }
.stat-box.learning .n { color: var(--orange); }
.stat-box.new .n { color: var(--primary); }

.menu-buttons { display: flex; flex-direction: column; gap: 10px; margin-top: auto; }

/* ---- карточка повторения ---- */
#review-screen { justify-content: space-between; }
.review-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 12px; }
.progress-bar-track { flex: 1; height: 6px; background: #d9e0f2; border-radius: 3px; margin: 0 10px; overflow: hidden; }
.progress-bar-fill { height: 100%; background: var(--primary); width: 0%; transition: width .2s; }
.close-btn { font-size: 22px; color: var(--muted); background: none; border: none; padding: 4px 8px; }
.delete-btn { font-size: 18px; background: none; border: none; padding: 4px 8px; }

.card {
  background: var(--card); border-radius: 20px; padding: 32px 20px; flex: 1;
  display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center;
  box-shadow: 0 1px 3px rgba(0,0,0,0.06);
}
.card .word { font-size: 30px; font-weight: 700; margin-bottom: 14px; }
.card .translation { font-size: 20px; color: var(--primary); margin-bottom: 14px; display: none; }
.card .example { font-size: 15px; color: var(--muted); line-height: 1.5; display: none; white-space: pre-line; }
.card.revealed .translation, .card.revealed .example { display: block; }

.reveal-btn { margin-top: 20px; background: none; border: 1px solid #d3d9ea; color: var(--primary); }

.answer-row { display: flex; gap: 10px; margin-top: 16px; }
.answer-row button { flex: 1; font-size: 17px; }
.btn-dont-know { background: #fdecea; color: var(--red); }
.btn-know { background: #e6f7ed; color: var(--green); }

.empty-state { text-align: center; color: var(--muted); margin: auto; padding: 20px; }

/* ---- добавление слова ---- */
#add-screen textarea, #add-screen input {
  width: 100%; padding: 14px; font-size: 16px; border-radius: 12px; border: 1px solid #d3d9ea; margin-bottom: 10px;
}
.add-result { background: var(--card); border-radius: 14px; padding: 16px; margin-top: 14px; display: none; }
.add-result.show { display: block; }
.hint { color: var(--muted); font-size: 13px; margin: -4px 0 14px; }

.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: #1b2233; color: #fff; padding: 10px 18px; border-radius: 10px; font-size: 14px;
  opacity: 0; pointer-events: none; transition: opacity .2s;
}
.toast.show { opacity: 1; }