:root {
    --primary: #007bff;
    --accent: #ff9800;
    --success: #28a745;
    --danger: #dc3545;
    --bg: #f4f4f9;
}

body {
    font-family: sans-serif;
    background: var(--bg);
    margin: 0;
    display: flex;
    flex-direction: column;
    height: 100vh;
}

.container {
    flex: 1;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    width: 100%;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

h1 { text-align: center; color: #333; }

/* SETUP SCREEN */
.section-title {
    font-weight: bold;
    margin: 20px 0 10px;
    color: #555;
    text-transform: uppercase;
    font-size: 0.9rem;
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

button {
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    background: white;
    font-size: 1rem;
    cursor: pointer;
    font-weight: 600;
    width: 100%;
    transition: all 0.2s;
}

button:hover { background: #f0f0f0; }

/* Active States */
button.active {
    border-color: var(--primary);
    background: #e3f2fd;
    color: var(--primary);
}

.special-btn.active {
    border-color: var(--accent);
    background: #fff3e0;
    color: #e65100;
}

/* Action Buttons */
.action-btn {
    border: none;
    color: white;
    margin-top: 10px;
}
.primary { background: var(--primary); }
.secondary { background: #6c757d; }
.danger { background: var(--danger); }
button:disabled { opacity: 0.5; cursor: not-allowed; }

/* QUIZ CARD */
.card {
    background: white;
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    text-align: center;
    margin-bottom: 20px;
}

.question { font-size: 1.8rem; font-weight: bold; margin: 15px 0; }
.hint { color: #888; font-style: italic; margin-bottom: 15px; }

input {
    width: 100%;
    padding: 12px;
    margin-bottom: 10px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 1.1rem;
    box-sizing: border-box;
    text-align: center;
}
input:focus { border-color: var(--primary); outline: none; }

#verb-inputs {
    display: flex;
    flex-direction: column;
    gap: 5px;
}

/* FEEDBACK */
.feedback { font-weight: bold; min-height: 20px; }
.correct { color: var(--success); }
.wrong { color: var(--danger); }
.typo { color: var(--accent); }

/* OVERLAY */
.overlay {
    display: none;
    position: fixed;
    top:0; left:0; right:0; bottom:0;
    background: rgba(0,0,0,0.5);
    z-index: 99;
    align-items: center;
    justify-content: center;
    padding: 20px;
}
.overlay-content {
    background: white;
    padding: 20px;
    border-radius: 10px;
    width: 100%;
    max-width: 400px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
}
.page-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 8px;
    overflow-y: auto;
    margin: 15px 0;
}
.page-item label {
    display: block;
    padding: 10px;
    background: #eee;
    text-align: center;
    border-radius: 5px;
    cursor: pointer;
}
.page-item input { display: none; }
.page-item input:checked + label {
    background: var(--primary);
    color: white;
}

/* PROGRESS */
.progress-bar-bg { height: 6px; background: #ddd; width: 100%; }
.progress-bar-fill { height: 100%; background: var(--success); width: 0%; transition: width 0.3s; }