@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@400;500;700&family=JetBrains+Mono&display=swap');

:root {
    --color-noun: #3B82F6;
    --color-verb: #EF4444;
    --color-mod: #10B981;
    --color-comp: #F59E0B;
}

body {
    font-family: 'Noto Sans TC', sans-serif;
    background-color: #f8fafc;
}

.mono {
    font-family: 'JetBrains Mono', monospace;
}

/* Flashcard Styles */
.perspective-1000 {
    perspective: 1000px;
}

.card-inner {
    transition: transform 0.6s;
    transform-style: preserve-3d;
    cursor: pointer;
}

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

.card-front,
.card-back {
    backface-visibility: hidden;
    border-radius: 0.75rem;
}

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

/* Chart Container */
.chart-container {
    position: relative;
    width: 100%;
    height: 240px;
    margin: 0 auto;
}

/* Sentence Surgery */
.surgery-span {
    transition: all 0.3s ease;
    padding: 2px 4px;
    border-radius: 4px;
    display: inline-block;
}

.fade-modifier {
    opacity: 0.2;
    filter: grayscale(1);
}

.highlight-verb {
    background-color: rgba(239, 68, 68, 0.15);
    color: #B91C1C;
    font-weight: bold;
    border-bottom: 2px solid #EF4444;
}

.highlight-subject {
    background-color: rgba(59, 130, 246, 0.15);
    color: #1E40AF;
    font-weight: bold;
}

.highlight-complement {
    background-color: rgba(245, 158, 11, 0.15);
    color: #92400E;
    font-weight: bold;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

.nav-active {
    border-bottom: 3px solid #3B82F6;
    color: #1D4ED8;
    font-weight: bold;
}

/* Skeleton Pulse */
.skeleton-reveal {
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        opacity: 1;
    }

    50% {
        opacity: 0.6;
    }

    100% {
        opacity: 1;
    }
}

/* Sentence Builder Styles */
.word-bank {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 50px;
    padding: 16px;
    background: #f1f5f9;
    border-radius: 12px;
    border: 2px dashed #cbd5e1;
}

.word-block {
    padding: 8px 16px;
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 8px;
    cursor: grab;
    font-weight: 500;
    transition: all 0.2s ease;
    user-select: none;
}

.word-block:hover {
    border-color: #3B82F6;
    box-shadow: 0 2px 8px rgba(59, 130, 246, 0.2);
}

.word-block.dragging {
    opacity: 0.5;
    cursor: grabbing;
}

.word-block.placed {
    background: #dbeafe;
    border-color: #3B82F6;
}

.sentence-slots {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    min-height: 60px;
    padding: 16px;
    background: white;
    border-radius: 12px;
    border: 2px solid #e2e8f0;
}

.slot {
    min-width: 80px;
    padding: 8px 16px;
    background: #f8fafc;
    border: 2px dashed #cbd5e1;
    border-radius: 8px;
    text-align: center;
    color: #94a3b8;
    transition: all 0.2s ease;
}

.slot.drag-over {
    border-color: #3B82F6;
    background: #eff6ff;
}

.slot.filled {
    background: #dbeafe;
    border: 2px solid #3B82F6;
    color: #1e40af;
    font-weight: 600;
}

.slot.correct {
    background: #dcfce7;
    border-color: #22c55e;
    color: #166534;
}

.slot.incorrect {
    background: #fee2e2;
    border-color: #ef4444;
    color: #991b1b;
}

/* Flashcard Example Cycling */
.example-nav {
    display: flex;
    gap: 4px;
    margin-top: 8px;
}

.example-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: all 0.2s;
}

.example-dot.active {
    background: white;
    transform: scale(1.3);
}

.error-note {
    color: #fbbf24;
    font-size: 0.7rem;
    display: block;
    margin-top: 4px;
}

/* Object Type Toggle */
#logic-obj-type {
    transition: all 0.3s ease;
}

#logic-obj-type.hidden {
    opacity: 0;
    max-height: 0;
    overflow: hidden;
    margin: 0;
    padding: 0;
}