:root {
    --blue: #4f8cff;
    --purple: #7c5cff;
    --pink: #ff6b9d;
    --yellow: #ffd166;
    --green: #06d6a0;
    --orange: #ff9f5a;
    --red: #ff5d6c;
    --text: #2b2f4c;
    --card-bg: #ffffff;
    --shadow: 0 10px 30px rgba(79, 92, 255, 0.15);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    color: var(--text);
    font-family: "Nunito", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: linear-gradient(160deg, #eef3ff 0%, #f3ecff 45%, #ffeef5 100%);
    background-attachment: fixed;
}

h1, h2, .flashcard-term {
    font-family: "Baloo 2", "Nunito", sans-serif;
}

* { box-sizing: border-box; }

.app {
    max-width: 480px;
    margin: 0 auto;
    padding: 32px 16px 64px;
    min-height: 100vh;
}

.card {
    background: var(--card-bg);
    border-radius: 24px;
    padding: 28px 24px;
    box-shadow: var(--shadow);
}

h1 {
    font-size: 1.7rem;
    font-weight: 800;
    margin-top: 0;
    color: var(--purple);
}

.muted { color: #8a90b8; font-size: 0.9rem; }
.error {
    color: var(--red);
    font-weight: 800;
    background: rgba(255, 93, 108, 0.1);
    padding: 8px 12px;
    border-radius: 12px;
}

a { color: var(--blue); text-decoration: none; font-weight: 700; }

/* Kinderauswahl */
.kid-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: 14px;
    margin: 20px 0;
}
.kid-tile {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 18px 8px;
    border-radius: 20px;
    color: #fff;
    font-weight: 800;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.12);
    transition: transform 0.15s ease;
}
.kid-tile:active { transform: scale(0.95); }
.kid-tile:nth-of-type(5n+1) { background: linear-gradient(135deg, var(--blue), var(--purple)); }
.kid-tile:nth-of-type(5n+2) { background: linear-gradient(135deg, var(--pink), var(--orange)); }
.kid-tile:nth-of-type(5n+3) { background: linear-gradient(135deg, var(--green), var(--blue)); }
.kid-tile:nth-of-type(5n+4) { background: linear-gradient(135deg, var(--yellow), var(--orange)); }
.kid-tile:nth-of-type(5n+5) { background: linear-gradient(135deg, var(--purple), var(--pink)); }
.kid-tile .avatar {
    font-size: 2.4rem;
    background: rgba(255, 255, 255, 0.25);
    border-radius: 50%;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.kid-tile .name { color: #fff; }

/* PIN */
.pin-form { display: flex; gap: 10px; margin-top: 20px; }
.pin-form input {
    font-size: 1.8rem;
    text-align: center;
    letter-spacing: 8px;
    width: 140px;
    padding: 10px;
    border-radius: 14px;
    border: 2px solid #e2e6ff;
    font-weight: 800;
}
.pin-form input:focus { outline: none; border-color: var(--blue); }

/* Decks */
.deck-list { display: flex; flex-direction: column; gap: 12px; margin: 20px 0; }
.deck-tile {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px 18px;
    border-radius: 18px;
    color: #fff;
    box-shadow: 0 8px 18px rgba(0, 0, 0, 0.1);
    transition: transform 0.15s ease;
}
.deck-tile:active { transform: scale(0.97); }
.deck-tile:nth-of-type(4n+1) { background: linear-gradient(120deg, var(--blue), var(--purple)); }
.deck-tile:nth-of-type(4n+2) { background: linear-gradient(120deg, var(--green), #34c2c2); }
.deck-tile:nth-of-type(4n+3) { background: linear-gradient(120deg, var(--orange), var(--pink)); }
.deck-tile:nth-of-type(4n+4) { background: linear-gradient(120deg, var(--purple), var(--pink)); }
.deck-tile .flag { font-size: 1.8rem; }
.deck-tile strong { font-size: 1.1rem; }
.deck-tile .muted { color: rgba(255, 255, 255, 0.85); }

/* Fortschritt beim Lernen */
.progress-wrap { margin: 4px 0 20px; }
.progress-bar {
    background: #eef1ff;
    border-radius: 999px;
    height: 12px;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--green), var(--blue));
    border-radius: 999px;
    transition: width 0.4s ease;
}
.progress-label {
    text-align: center;
    font-weight: 800;
    color: var(--purple);
    margin-top: 6px;
    font-size: 0.9rem;
}

/* Flashcard mit Flip-Animation */
.flashcard { text-align: center; margin-top: 8px; }
.flip-card {
    perspective: 1200px;
    margin-bottom: 20px;
}
.flip-card-inner {
    position: relative;
    width: 100%;
    min-height: 180px;
    transform-style: preserve-3d;
    transition: transform 0.6s cubic-bezier(.34, 1.56, .64, 1);
}
.flip-card.flipped .flip-card-inner { transform: rotateY(180deg); }
.flip-card-front, .flip-card-back {
    position: absolute;
    inset: 0;
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    text-align: center;
    color: #fff;
}
.flip-card-front { background: linear-gradient(135deg, var(--blue), var(--purple)); }
.flip-card-back {
    background: linear-gradient(135deg, var(--orange), var(--pink));
    transform: rotateY(180deg);
}
.flashcard-term { font-size: 2rem; font-weight: 800; }
.flashcard-translation { font-size: 1.5rem; font-weight: 800; }
.flashcard-translation .example {
    display: block;
    font-family: "Nunito", sans-serif;
    font-size: 1rem;
    font-weight: 400;
    margin-top: 8px;
    opacity: 0.9;
}
.answer-buttons { display: flex; flex-direction: column; gap: 12px; margin-top: 16px; }

button {
    font-family: "Baloo 2", "Nunito", sans-serif;
    font-size: 1.15rem;
    font-weight: 700;
    padding: 16px;
    border: none;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--blue), var(--purple));
    color: #fff;
    cursor: pointer;
    width: 100%;
    box-shadow: 0 8px 16px rgba(79, 140, 255, 0.35);
    transition: transform 0.12s ease;
}
button:active { transform: scale(0.96); }
button.btn-right { background: linear-gradient(135deg, var(--green), #34c2c2); box-shadow: 0 8px 16px rgba(6, 214, 160, 0.35); }
button.btn-wrong { background: linear-gradient(135deg, var(--orange), var(--red)); box-shadow: 0 8px 16px rgba(255, 93, 108, 0.35); }
button.btn-danger { background: var(--red); width: auto; padding: 8px 16px; font-size: 0.9rem; box-shadow: none; }
button.btn-secondary {
    background: #f3f5ff;
    color: var(--text);
    box-shadow: none;
    border: 2px solid #e2e6ff;
}
button.btn-secondary:disabled { opacity: 0.6; }

form input[type="text"],
form input[type="password"],
form select,
form textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 14px;
    border: 2px solid #e2e6ff;
    margin: 4px 0 14px;
    font-size: 1rem;
    font-family: inherit;
    background: #fff;
}
form textarea { border-radius: 14px; resize: vertical; }
form input[type="text"]:focus,
form input[type="password"]:focus,
form select:focus,
form textarea:focus { outline: none; border-color: var(--blue); }

.import-summary {
    background: #f3f5ff;
    border-radius: 14px;
    padding: 14px 16px;
    margin: 12px 0 18px;
    font-size: 0.95rem;
}

/* Erfolge / Statistik */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 20px 0;
}
.stat-tile {
    border-radius: 18px;
    padding: 18px 12px;
    text-align: center;
    color: #fff;
}
.stat-tile.stat-streak { background: linear-gradient(135deg, var(--orange), var(--red)); }
.stat-tile.stat-stars { background: linear-gradient(135deg, var(--yellow), var(--orange)); }
.stat-emoji { font-size: 1.8rem; }
.stat-number { font-family: "Baloo 2", sans-serif; font-size: 2.2rem; font-weight: 800; line-height: 1.1; }
.stat-label { font-size: 0.85rem; opacity: 0.9; }

.badge-row {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(84px, 1fr));
    gap: 10px;
    margin: 12px 0 24px;
}
.badge {
    text-align: center;
    padding: 12px 6px;
    border-radius: 14px;
    background: #f3f5ff;
}
.badge.locked { opacity: 0.35; filter: grayscale(1); }
.badge-emoji { font-size: 1.6rem; }
.badge-label { font-size: 0.7rem; font-weight: 700; color: var(--text); margin-top: 4px; }

.deck-progress-list { display: flex; flex-direction: column; gap: 14px; margin: 12px 0 20px; }
.deck-progress-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 4px;
}
.deck-progress-bar {
    background: #eef1ff;
    border-radius: 999px;
    height: 10px;
    overflow: hidden;
}
.deck-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--green), var(--blue));
    border-radius: 999px;
}
.import-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; margin-bottom: 16px; }
.import-table th { text-align: left; padding: 6px 8px; border-bottom: 2px solid #eee; }
.import-table td { padding: 6px 8px; border-bottom: 1px solid #f0f1fa; }
.import-table tr.needs-review { background: #fff6e0; }
.review-tag { color: var(--orange); font-weight: 700; font-size: 0.8rem; white-space: nowrap; }

.admin-nav { list-style: none; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.admin-nav a {
    display: block;
    padding: 14px 16px;
    background: #f3f5ff;
    border-radius: 14px;
}
.admin-table { width: 100%; border-collapse: collapse; margin: 16px 0; }
.admin-table td { padding: 10px 0; border-bottom: 1px solid #f0f1fa; vertical-align: middle; }

.done { text-align: center; margin-top: 12px; }
.done-emoji {
    font-size: 4rem;
    animation: pop-in 0.5s cubic-bezier(.34, 1.56, .64, 1);
}
.btn-link {
    display: inline-block;
    margin-top: 16px;
    padding: 14px 24px;
    background: linear-gradient(135deg, var(--blue), var(--purple));
    color: #fff;
    border-radius: 999px;
    font-family: "Baloo 2", sans-serif;
    font-weight: 700;
}

@keyframes pop-in {
    0% { transform: scale(0); opacity: 0; }
    70% { transform: scale(1.2); opacity: 1; }
    100% { transform: scale(1); }
}

/* Konfetti bei richtiger Antwort */
.confetti-piece {
    position: fixed;
    top: -10px;
    font-size: 1.6rem;
    pointer-events: none;
    z-index: 999;
    animation: confetti-fall linear forwards;
}
@keyframes confetti-fall {
    to {
        transform: translateY(100vh) rotate(360deg);
        opacity: 0.3;
    }
}