/* study-select-category.css */
.study-selection-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 4rem 2rem;
}

.study-selection-header {
    text-align: center;
    margin-bottom: 4rem;
}

.study-selection-title {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--text-main);
    letter-spacing: -0.02em;
}

.study-selection-text {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto;
}

.study-topic-group-title {
    color: var(--text-main);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    text-align: right;
}

.study-selection-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

.study-card {
    flex: 1 1 280px;
    max-width: 310px;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 3rem 2rem;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.study-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-hover));
    opacity: 0;
    transition: var(--transition);
}

.study-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.study-card:hover::before {
    opacity: 1;
}

.study-card-icon {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: var(--primary-light);
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.study-card:hover .study-card-icon {
    transform: scale(1.1) rotate(5deg);
}

.study-card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.study-card-desc {
    color: var(--text-muted);
    margin-bottom: 2rem;
    flex: 1;
    line-height: 1.6;
}

.study-card-btn {
    width: 100%;
    margin-top: auto;
}

.study-modal {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 200;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
}

.study-modal.is-open { display: flex; }

.study-modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(17, 24, 39, 0.58);
    backdrop-filter: blur(3px);
}

.study-modal-content {
    position: relative;
    z-index: 1;
    width: min(100%, 450px);
    padding: 2.5rem;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.study-modal-kicker { color: var(--primary-color); font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.08em; }
.study-modal-content h2 { margin: 0.35rem 0 0.5rem; font-size: 1.8rem; }
.study-modal-content > p:not(.study-modal-kicker) { color: var(--text-muted); }
.study-modal-close { position: absolute; top: 0.8rem; right: 1rem; border: 0; background: none; color: var(--text-muted); font-size: 2rem; cursor: pointer; line-height: 1; }
.study-count-options { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 1.75rem; }
.study-count-button { border: 1px solid var(--border-color); background: var(--bg-color); border-radius: var(--radius-md); color: var(--text-main); padding: 0.9rem; font: inherit; font-weight: 600; cursor: pointer; transition: var(--transition); }
.study-count-button:hover { background: var(--primary-light); border-color: var(--primary-color); color: var(--primary-hover); }

@media (max-width: 768px) {
    .study-selection-container {
        padding: 3rem 1rem;
    }

    .study-selection-header {
        margin-bottom: 3rem;
    }

    .study-selection-title {
        font-size: 2.25rem;
    }

    .study-selection-grid {
        display: grid;
        grid-template-columns: 1fr;
    }

    .study-card {
        max-width: none;
    }

    .study-modal-content { padding: 2rem 1.5rem; }
}