:root {
  --bg: #eee2dc;
  --ink: #123c69;
  --accent: #ac3b61;
  --accent-dark: #832d4a;
  --card-bg: #ffffff;
  --muted: #bab2b5;
  --error: #832d4a;
  --border: #edc7b7;
  --highlight: #edc7b7;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
}

.page {
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  padding: 20px 16px;
}

header.topbar {
  width: 100%;
  max-width: 480px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 8px 12px;
  margin-bottom: 20px;
}

header.topbar h1 {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  margin: 0;
}

header.topbar nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

header.topbar nav a,
header.topbar button {
  font-size: 0.85rem;
  margin: 0;
}

.card-form,
.panel {
  width: 100%;
  max-width: 420px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
}

.card-form h1 {
  margin-top: 0;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

label {
  display: block;
  font-size: 0.85rem;
  color: var(--ink);
  opacity: 0.7;
  margin: 14px 0 4px;
}

input[type='email'],
input[type='password'],
input[type='text'] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 16px;
  font-family: inherit;
  color: var(--ink);
}

button {
  cursor: pointer;
  border: none;
  border-radius: 8px;
  padding: 10px 16px;
  font-size: 0.9rem;
  font-family: inherit;
  font-weight: 600;
  background: var(--accent);
  color: #fff;
  min-height: 40px;
}

button:hover {
  background: var(--accent-dark);
}

button.secondary {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border);
}

button.danger {
  background: var(--error);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.submit-row {
  margin-top: 20px;
  display: flex;
  gap: 8px;
}

.error {
  color: var(--error);
  font-size: 0.9rem;
  min-height: 1.2em;
  margin-top: 10px;
}

a {
  color: var(--accent);
  font-weight: 600;
}

/* Flashcards */

.card-stage {
  width: 100%;
  max-width: 420px;
  min-height: 280px;
  height: clamp(280px, 60vh, 340px);
  position: relative;
  touch-action: pan-y;
}

.flashcard {
  position: absolute;
  inset: 0;
  touch-action: pan-y;
  user-select: none;
  cursor: grab;
  transition: transform 0.25s ease, opacity 0.25s ease;
  perspective: 1000px;
}

.flashcard:active {
  cursor: grabbing;
}

.flip-inner {
  position: relative;
  width: 100%;
  height: 100%;
  touch-action: pan-y;
  transition: transform 0.4s ease;
  transform-style: preserve-3d;
}

.flip-inner.flipped {
  transform: rotateY(180deg);
}

.flip-face,
.flip-face * {
  touch-action: pan-y;
}

.flip-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: clamp(20px, 6vw, 32px) clamp(16px, 5vw, 24px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  gap: 12px;
  box-shadow: 0 8px 24px rgba(18, 60, 105, 0.08);
  overflow-y: auto;
}

.flip-back {
  transform: rotateY(180deg);
}

.flashcard .favorite-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  z-index: 2;
  min-height: unset;
  background: none;
  border: none;
  padding: 6px;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--muted);
}

.flashcard .favorite-btn:hover {
  background: none;
  color: var(--accent);
}

.flashcard .favorite-btn.active {
  color: var(--accent);
}

header.topbar nav button.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.flashcard .word-type {
  font-size: 0.7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--highlight);
  padding: 4px 10px;
  border-radius: 999px;
}

.flashcard .word {
  font-size: clamp(1.4rem, 6vw, 1.9rem);
  font-weight: 700;
  color: var(--ink);
}

.flashcard .meaning {
  font-size: clamp(1rem, 4vw, 1.1rem);
  font-weight: 600;
  color: var(--accent);
}

.flashcard .example {
  font-size: 0.9rem;
  color: var(--ink);
  opacity: 0.65;
  font-style: italic;
  margin-top: 8px;
}

.card-controls {
  width: 100%;
  max-width: 420px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 16px;
  gap: 8px;
}

.card-progress {
  font-size: 0.85rem;
  color: var(--ink);
  opacity: 0.7;
}

.empty-state {
  color: var(--ink);
  opacity: 0.7;
  text-align: center;
}

/* Admin */

.panel {
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 320px;
  border-collapse: collapse;
  margin-top: 16px;
}

th,
td {
  text-align: left;
  padding: 8px 6px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  white-space: nowrap;
}

.add-user-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: flex-end;
  margin-top: 20px;
}

.add-user-form > div {
  flex: 1;
  min-width: 140px;
}

.success {
  color: #1e7a34;
  font-size: 0.9rem;
  margin-top: 10px;
}

/* Small phones */
@media (max-width: 380px) {
  .page {
    padding: 14px 10px;
  }

  .card-form,
  .panel {
    padding: 18px;
  }

  header.topbar h1 {
    font-size: 1rem;
  }

  header.topbar nav a,
  header.topbar button {
    font-size: 0.78rem;
    padding: 8px 10px;
  }
}