/* ── Reset ─────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ── Base ──────────────────────────────────────── */
body {
  font-family: 'Nunito', sans-serif;
  background: #F0F2F5;
  color: #1C1E21;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

/* ── App shell ─────────────────────────────────── */
.app {
  width: 100%;
  max-width: 480px;
}

/* ── Header ────────────────────────────────────── */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

h1 {
  font-size: 24px;
  font-weight: 900;
  color: #1877F2;
  letter-spacing: -0.5px;
}

.session-score {
  font-size: 14px;
  font-weight: 700;
  color: #1877F2;
  background: #E7F3FF;
  padding: 6px 14px;
  border-radius: 20px;
}

/* ── Progress bar ──────────────────────────────── */
.progress-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 22px;
}

.progress-bar-wrap {
  flex: 1;
  height: 10px;
  background: #DAE0E8;
  border-radius: 99px;
  overflow: hidden;
}

.progress-bar {
  height: 100%;
  background: #1877F2;
  border-radius: 99px;
  width: 0%;
  transition: width 0.5s ease;
}

.progress-label {
  font-size: 12px;
  font-weight: 700;
  color: #65676B;
  white-space: nowrap;
}

/* ── Card ──────────────────────────────────────── */
.card {
  background: #fff;
  border-radius: 20px;
  padding: 36px 32px 32px;
  box-shadow: 0 2px 16px rgba(0, 0, 0, 0.09);
  text-align: center;
  min-height: 340px;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.direction-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1.2px;
  text-transform: uppercase;
  color: #1877F2;
  background: #E7F3FF;
  padding: 4px 12px;
  border-radius: 99px;
  margin-bottom: 22px;
  align-self: center;
}

.word {
  font-size: 38px;
  font-weight: 900;
  color: #1C1E21;
  line-height: 1.15;
  word-break: break-word;
}

/* ── Input phase ───────────────────────────────── */
#input-phase input {
  width: 100%;
  padding: 14px 16px;
  font-family: 'Nunito', sans-serif;
  font-size: 16px;
  font-weight: 600;
  border: 2.5px solid #E4E6EB;
  border-radius: 12px;
  outline: none;
  transition: border-color 0.18s;
  margin-bottom: 14px;
  color: #1C1E21;
}

#input-phase input:focus {
  border-color: #1877F2;
}

#input-phase input::placeholder {
  color: #BCC0C4;
  font-weight: 600;
}

/* ── Button row ────────────────────────────────── */
.btn-row {
  display: flex;
  gap: 10px;
}

/* Primary button */
.btn-primary {
  flex: 1;
  padding: 14px;
  background: #1877F2;
  color: #fff;
  border: none;
  border-radius: 12px;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s;
}

.btn-primary:hover {
  background: #1466D8;
}

.btn-primary:active {
  transform: scale(0.97);
}

/* Secondary button */
.btn-secondary {
  flex: 1;
  padding: 14px;
  background: #E7F3FF;
  color: #1877F2;
  border: none;
  border-radius: 12px;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s;
}

.btn-secondary:hover {
  background: #D2E4FF;
}

.btn-secondary:active {
  transform: scale(0.97);
}

/* ── Show-me phase ─────────────────────────────── */
#show-phase {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
}

.revealed-answer {
  font-size: 28px;
  font-weight: 900;
  color: #1877F2;
}

.self-rate-prompt {
  font-size: 14px;
  font-weight: 700;
  color: #65676B;
}

.btn-knew {
  flex: 1;
  padding: 14px;
  background: #E6F4EA;
  color: #1E7E34;
  border: none;
  border-radius: 12px;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s;
}

.btn-knew:hover {
  background: #C8E6C9;
}

.btn-knew:active {
  transform: scale(0.97);
}

.btn-didnt {
  flex: 1;
  padding: 14px;
  background: #FDECEA;
  color: #C62828;
  border: none;
  border-radius: 12px;
  font-family: 'Nunito', sans-serif;
  font-size: 15px;
  font-weight: 800;
  cursor: pointer;
  transition: background 0.18s, transform 0.1s;
}

.btn-didnt:hover {
  background: #FFCDD2;
}

.btn-didnt:active {
  transform: scale(0.97);
}

/* ── Result phase ──────────────────────────────── */
#result-phase {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}

.result-message {
  font-size: 26px;
  font-weight: 900;
}

.result-message.correct {
  color: #1E7E34;
}

.result-message.wrong {
  color: #C62828;
}

.result-answer {
  font-size: 17px;
  font-weight: 600;
  color: #65676B;
  margin-bottom: 14px;
}

#result-phase .btn-primary {
  width: 100%;
}

/* ── Stats footer ──────────────────────────────── */
.stats-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 16px;
  padding: 0 4px;
}

#stats-detail {
  font-size: 12px;
  font-weight: 600;
  color: #8A8D91;
}

.reset-btn {
  font-family: 'Nunito', sans-serif;
  font-size: 12px;
  font-weight: 700;
  color: #8A8D91;
  background: none;
  border: none;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

.reset-btn:hover {
  color: #C62828;
}

/* ── Auth bar ──────────────────────────────────── */
.auth-bar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 8px;
  margin-bottom: 10px;
  min-height: 28px;
}

.auth-status {
  font-size: 12px;
  font-weight: 600;
  color: #65676B;
  max-width: 160px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.auth-btn {
  font-family: 'Nunito', sans-serif;
  font-size: 12px;
  font-weight: 700;
  color: #1877F2;
  background: #E7F3FF;
  border: none;
  border-radius: 20px;
  padding: 5px 12px;
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.18s;
}

.auth-btn:hover {
  background: #D2E4FF;
}

/* ── Word row (word + speak button) ─────────────── */
.word-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  margin-bottom: 32px;
}

.word-row .word {
  margin-bottom: 0;
}

.speak-btn {
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  opacity: 0.55;
  transition: opacity 0.18s, transform 0.1s;
  padding: 4px;
  flex-shrink: 0;
  line-height: 1;
}

.speak-btn:hover {
  opacity: 1;
}

.speak-btn:active {
  transform: scale(0.9);
}

/* ── Utility ───────────────────────────────────── */
.hidden {
  display: none !important;
}