:root {
  color-scheme: light dark;
  --bg: #050816;
  --bg-elevated: #0b1220;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.12);
  --accent-strong: rgba(56, 189, 248, 0.32);
  --text: #e5e7eb;
  --text-soft: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.35);
  --danger: #fb7185;
  --radius-lg: 18px;
  --radius-pill: 999px;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.75);
  --shadow-chip: 0 10px 25px rgba(15, 23, 42, 0.7);
  --transition-fast: 160ms ease-out;
  --transition-med: 220ms ease;
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-sans);
  background: radial-gradient(circle at top, #1d2a44 0, #050816 52%, #020617 100%);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
}

.app {
  min-height: 100vh;
  max-width: 720px;
  margin: 0 auto;
  padding: 12px 14px 22px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: relative;
}

@media (min-width: 768px) {
  .app {
    padding-top: 32px;
  }
}

.app-header {
  padding: 14px 14px 4px;
  border-radius: 26px;
  background: radial-gradient(circle at top left, #0f172a 0, #020617 55%);
  border: 1px solid rgba(148, 163, 184, 0.25);
  box-shadow: var(--shadow-soft);
}

.app-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.app-title {
  font-size: 1.4rem;
  letter-spacing: 0.04em;
  text-transform: lowercase;
  margin: 0;
  font-weight: 650;
}

.app-badge {
  font-size: 0.7rem;
  text-transform: uppercase;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: var(--text-soft);
}

.app-subtitle {
  margin: 6px 0 0;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.mode-switcher {
  display: none;
}

.mode-btn {
  flex: 1;
  border: none;
  border-radius: var(--radius-pill);
  padding: 8px 10px;
  font-size: 1.25rem;
  font-weight: 500;
  color: var(--text-soft);
  background: transparent;
  cursor: pointer;
  position: relative;
  transition:
    background-color var(--transition-med),
    color var(--transition-med),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.mode-btn.settings-btn {
  position: absolute;
  top: 12px;
  right: 14px;
  flex: 0 0 auto;
  padding: 6px 12px;
  font-size: 0.85rem;
  z-index: 20;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-soft);
  cursor: pointer;
  transition:
    background-color var(--transition-med),
    color var(--transition-med),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.mode-btn.settings-btn:hover {
  background: rgba(15, 23, 42, 1);
  transform: translateY(-0.5px);
}

.mode-btn.switch-btn {
  position: absolute;
  top: 12px;
  left: 14px;
  flex: 0 0 auto;
  min-width: 50px;
  font-size: 1.5rem;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-soft);
  cursor: pointer;
  transition:
    background-color var(--transition-med),
    color var(--transition-med),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.mode-btn.switch-btn:hover {
  background: rgba(15, 23, 42, 1);
  transform: translateY(-0.5px);
}

.mode-btn.show-all-btn {
  position: absolute;
  top: 12px;
  left: 72px;
  flex: 0 0 auto;
  min-width: 50px;
  font-size: 1.5rem;
  padding: 8px 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.3);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-soft);
  cursor: pointer;
  transition:
    background-color var(--transition-med),
    color var(--transition-med),
    transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.mode-btn.show-all-btn:hover {
  background: rgba(15, 23, 42, 1);
  transform: translateY(-0.5px);
}

.mode-btn.is-active {
  background: radial-gradient(circle at top, var(--accent) 0, #0ea5e9 55%);
  color: #0b1120;
  box-shadow: var(--shadow-chip);
  transform: translateY(-1px);
}

.mode-btn:active {
  transform: translateY(0);
}

.settings-panel {
  margin-top: 4px;
  border-radius: 18px;
  border: 1px solid rgba(148, 163, 184, 0.35);
  background: rgba(15, 23, 42, 0.96);
  padding: 8px 10px 10px;
  display: none;
}

.settings-panel.is-open {
  display: block;
}

.settings-inner {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.8rem;
}

.settings-title {
  margin: 0 0 4px;
  font-size: 0.78rem;
  color: var(--text-soft);
}

.settings-option {
  display: flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
}

.settings-option input[type="radio"] {
  accent-color: var(--accent);
}

.bottom-nav {
  position: sticky;
  bottom: 0;
  margin-top: auto;
  display: flex;
  gap: 6px;
  padding: 8px 4px 4px;
  background: linear-gradient(to top, rgba(15, 23, 42, 0.96), transparent);
}

.bottom-nav-btn {
  flex: 1;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(148, 163, 184, 0.5);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-soft);
  font-size: 0.78rem;
  padding: 6px 8px;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.bottom-nav-btn.is-active {
  background: radial-gradient(circle at top, var(--accent) 0, #0ea5e9 55%);
  color: #020617;
  box-shadow: var(--shadow-chip);
  border-color: transparent;
  transform: translateY(-1px);
}

.bottom-nav-btn[data-tab="ready"]::after {
  content: attr(data-count);
  margin-left: 6px;
  font-size: 0.7rem;
  color: inherit;
  opacity: 0.85;
}

.phrases {
  margin-top: 30px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  padding-bottom: 18px;
}

.phrase-card {
  border-radius: 20px;
  background: radial-gradient(circle at top left, #020617 0, #020617 55%);
  border: 1px solid rgba(148, 163, 184, 0.32);
  padding: 12px 14px 11px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  text-align: center;
  margin-top: 4px;
}

.phrase-card:nth-child(odd) {
  background: radial-gradient(circle at top right, #020617 0, #020617 60%);
}

.phrase-languages {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.phrase-row {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 6px;
}

.lang-label {
  display: none;
}

.lang-value {
  flex: 0 0 auto;
  width: 100%;
  text-align: center;
  font-size: 0.98rem;
  font-weight: 500;
  line-height: 1.35;
}

.lang-value small {
  font-size: 0.8rem;
  color: var(--text-soft);
}

.chip {
  display: none;
}

.chip-dot {
  display: none;
}

.section-label {
  margin-top: 14px;
  margin-bottom: 2px;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  opacity: 0.9;
}

.app-footer {
  margin-top: auto;
  padding: 6px 2px 0;
  font-size: 0.75rem;
  color: var(--text-soft);
}

.hint {
  margin: 0;
}

.memory-hook-container {
  margin-top: 8px;
  margin-bottom: 4px;
}

.memory-hook-display {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-soft);
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    color var(--transition-fast);
  min-height: 1.5em;
  display: flex;
  align-items: center;
  justify-content: center;
}

.memory-hook-display:hover {
  background: rgba(15, 23, 42, 0.6);
}

.memory-hook-text {
  position: relative;
  display: inline-block;
}

.memory-hook-text.placeholder {
  opacity: 0.6;
  font-style: italic;
}

.memory-hook-container.editing .memory-hook-display {
  display: none;
}

.memory-hook-input {
  width: 100%;
  padding: 6px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--accent);
  background: rgba(15, 23, 42, 0.95);
  color: var(--text);
  font-size: 0.85rem;
  font-family: var(--font-sans);
  text-align: center;
  outline: none;
}

.memory-hook-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}

.memory-hook-container.editing .memory-hook-input {
  display: block;
}

.progress-actions {
  margin-top: 8px;
  display: flex;
  justify-content: center;
  gap: 30px;
  align-items: center;
  opacity: 0.7;

}

.progress-btn {
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text-soft);
  font-size: 0.7rem;
  padding: 4px 8px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  cursor: pointer;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    transform var(--transition-fast);
}

.progress-btn span.count {
  font-size: 0.68rem;
  opacity: 0.8;
}

.progress-btn.known {
  border-color: rgba(45, 212, 191, 0.65);
}

.progress-btn.unknown {
  border-color: rgba(248, 113, 113, 0.8);
}

.progress-btn:hover {
  background: rgba(15, 23, 42, 1);
  transform: translateY(-0.5px);
}

.progress-btn:active {
  transform: translateY(0);
}

.pron-hint {
  font-size: 1rem;
  /* inherit color so it hides together with the main word */
  color: inherit;
  opacity: 0.7;
  margin-left: 6px;
}

.category-zone {
  margin-top: 16px;
}

.category-zone-title {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-soft);
  margin: 0 2px 4px;
  opacity: 0.9;
}

.countdown {
  margin-top: 4px;
  font-size: 0.7rem;
  color: var(--text-soft);
  display: flex;
  justify-content: center;
  gap: 4px;
  align-items: center;
}

.countdown-dot {
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--accent);
  opacity: 0.8;
  animation: countdown-pulse 1.8s ease-in-out infinite;
}

.countdown-label {
  opacity: 0.9;
}

@keyframes countdown-pulse {
  0% {
    transform: scale(0.9);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.1);
    opacity: 1;
  }
  100% {
    transform: scale(0.9);
    opacity: 0.6;
  }
}

.phrase-card {
  will-change: transform, opacity;
}

.card-moved {
  animation: card-move 0.5s cubic-bezier(0.18, 0.89, 0.32, 1.28);
}

@keyframes card-move {
  from {
    opacity: 0;
    transform: translateY(10px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/*
 * Hiding / reveal behavior
 */

.cover-target {
  position: relative;
  cursor: pointer;
  touch-action: manipulation;
  user-select: none;
  -webkit-user-select: none;
}

.cover-target::after {
  content: "";
  position: absolute;
  inset: -4px;
}

.is-covered .lang-text {
  color: transparent;
  text-shadow: none;
}

.is-covered .lang-text::before {
  content: "••••••••";
  letter-spacing: 0.14em;
  color: var(--accent-strong);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
}

.is-covered .lang-text {
  background: linear-gradient(120deg, #020617 0, #020617 50%, #020617 100%);
  border-radius: 999px;
  padding-inline: 8px;
}

.is-covered .memory-hook-text {
  color: transparent;
  text-shadow: none;
}

.is-covered .memory-hook-text::before {
  content: "••••••••";
  letter-spacing: 0.14em;
  color: var(--accent-strong);
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  white-space: nowrap;
}

.is-covered .memory-hook-text {
  background: linear-gradient(120deg, #020617 0, #020617 50%, #020617 100%);
  border-radius: 999px;
  padding-inline: 8px;
}

.cover-target.is-pressed .lang-text {
  color: var(--text);
}

.cover-target.is-pressed .lang-text::before {
  content: "";
}

.cover-target.is-pressed .memory-hook-text {
  color: var(--text);
}

.cover-target.is-pressed .memory-hook-text::before {
  content: "";
}

.cover-target.is-pressed {
  background: radial-gradient(circle at top, var(--accent-soft) 0, transparent 65%);
  border-radius: 999px;
}

.lang-text {
  display: inline-block;
  position: relative;
  min-height: 1.4em;
}

.memory-hook-text {
  position: relative;
  display: inline-block;
  min-height: 1.4em;
}

@media (min-width: 640px) {
  .phrase-card {
    padding-inline: 16px;
  }

  .lang-value {
    font-size: 1.02rem;
  }
}