/* Main Theory Screen Structure */
#theory-screen {
    /* Uses default .screen background */
}

.screen-content {
    padding-top: 20px;
}

.theory-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 20px;
    padding: 30px 24px 60px;
}

.theory-card {
    background: var(--bg-card);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.theory-card:hover {
    transform: translateY(-5px);
    background: var(--bg-card-hover);
    border-color: var(--primary);
}

.theory-card-icon {
    font-size: 32px;
    margin-bottom: 5px;
}

.theory-card-title {
    font-size: 15px;
    font-weight: 700;
    color: var(--text);
}

.theory-card-tag {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    padding: 3px 8px;
    border-radius: 10px;
    font-weight: 800;
}

.tag-basic { background: rgba(88, 204, 2, 0.2); color: #58CC02; }
.tag-intermediate { background: rgba(28, 176, 246, 0.2); color: #1CB0F6; }
.tag-advanced { background: rgba(206, 130, 255, 0.2); color: #CE82FF; }

/* Article View */
.theory-content-view {
    padding: 0 20px 40px;
    animation: fadeIn 0.3s ease;
}

.theory-back-to-list {
    background: none;
    border: none;
    color: var(--primary);
    font-weight: 700;
    cursor: pointer;
    padding: 15px 0;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
}

.theory-article {
    background: var(--bg-card);
    border-radius: 24px;
    padding: 30px;
    border: 1px solid var(--border);
    line-height: 1.6;
}

.theory-article h3 {
    color: var(--primary);
    margin: 25px 0 15px;
    font-size: 20px;
    border-left: 4px solid var(--primary);
    padding-left: 15px;
}

.theory-article p {
    margin-bottom: 15px;
    color: var(--text-secondary);
}

.theory-article ul {
    margin-left: 20px;
    margin-bottom: 20px;
}

.theory-article li {
    margin-bottom: 8px;
}

.example-box {
.example-box {
    background: var(--bg-elevated);
    border-radius: 12px;
    padding: 15px;
    margin: 15px 0;
    border-left: 4px solid var(--secondary);
}

.example-item {
    font-style: italic;
    color: var(--secondary);
    margin-bottom: 5px;
}

.example-translation {
    font-size: 14px;
    color: var(--text-muted);
}

.tip-box {
    background: var(--bg-elevated);
    border-left: 4px solid var(--primary);
    border-radius: 12px;
    padding: 15px;
    margin-top: 25px;
    display: flex;
    gap: 15px;
    align-items: flex-start;
}

.tip-icon {
    font-size: 24px;
}

.tip-text {
    font-size: 14px;
    color: var(--text);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Specialized Content Boxes */
.reading-box {
    background: var(--bg-elevated);
    border-radius: 16px;
    padding: 20px;
    margin: 20px 0;
    border: 1px dashed var(--secondary);
    position: relative;
}

.reading-box::before {
    content: "📖 Lectura";
    position: absolute;
    top: -12px;
    left: 20px;
    background: var(--secondary);
    color: var(--text);
    padding: 2px 10px;
    border-radius: 8px;
    font-size: 11px;
    font-weight: 800;
    text-transform: uppercase;
}

.tip-box-premium {
    background: var(--bg-elevated);
    border-left: 4px solid var(--accent);
    border-radius: 16px;
    padding: 20px;
    margin: 20px 0;
    border: 1px solid var(--border);
    position: relative;
    display: flex;
    gap: 15px;
    align-items: center;
}

.tip-box-premium .tip-icon {
    font-size: 24px;
    filter: drop-shadow(0 0 5px var(--accent));
}

.tip-box-premium .tip-text {
    flex: 1;
    color: var(--text);
    font-style: italic;
    font-size: 15px;
}

@media (max-width: 600px) {
    .theory-list {
        grid-template-columns: repeat(2, 1fr);
    }
    .theory-article {
        padding: 20px;
    }
}