.tool-fullwidth {
    width: 100%;
    max-width: 100%;
    margin: 0;
    padding: 0;
}

/* Tool shell */
.academic-tool {
    max-width: 100%;
    margin: 0 auto;
}

.academic-tool.editor-section,
.editor-section.academic-tool {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.academic-tool .card:not(.result-card) {
    border: 1px solid var(--color-border, #e5e7eb);
    box-shadow: var(--shadow-sm, 0 1px 3px rgba(0, 0, 0, 0.06));
    border-radius: var(--radius, 12px);
    background: var(--color-surface, #fff);
}

.academic-tool .card-body {
    padding: 1.25rem 1.35rem;
}

.academic-tool .card-title {
    color: var(--color-text, #1f2937);
    font-weight: 700;
    font-size: 1.05rem;
}

.academic-tool .form-control,
.academic-tool .form-select,
.academic-tool .select-input,
.academic-tool textarea {
    border-radius: 8px;
    border: 1px solid var(--color-border, #e5e7eb);
}

.academic-tool .form-control:focus,
.academic-tool .form-select:focus,
.academic-tool textarea:focus {
    border-color: var(--color-primary, #0d9488);
    box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.15);
}

.academic-tool .btn-primary {
    background: var(--color-primary, #0d9488);
    border-color: var(--color-primary, #0d9488);
}

.academic-tool .btn-primary:hover {
    background: var(--color-primary-hover, #0f766e);
    border-color: var(--color-primary-hover, #0f766e);
}

.academic-tool .alert {
    border-radius: 10px;
}

[data-theme="dark"] .academic-tool .card:not(.result-card) {
    background: var(--color-surface, #1f2937);
    border-color: var(--color-border, #374151);
}

[data-theme="dark"] .academic-tool .card-title,
[data-theme="dark"] .academic-tool .form-label,
[data-theme="dark"] .academic-tool {
    color: var(--color-text, #f9fafb);
}

[data-theme="dark"] .academic-tool .text-muted,
[data-theme="dark"] .academic-tool .form-text {
    color: var(--color-text-secondary, #9ca3af) !important;
}

[data-theme="dark"] .academic-tool .form-control,
[data-theme="dark"] .academic-tool .form-select,
[data-theme="dark"] .academic-tool textarea {
    background: #111827;
    color: var(--color-text, #f9fafb);
    border-color: var(--color-border, #374151);
}

/* --- tool: prime-factorization-calculator --- */
.prime-factorization { background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); min-height: auto; padding: 2rem 0; }
.calculator-container { background: rgba(255,255,255,.95); border-radius: 20px; box-shadow: 0 20px 40px rgba(0,0,0,.1); backdrop-filter: blur(10px); }
.preview { text-align:center; padding:2rem; background: linear-gradient(45deg,#f093fb 0%,#f5576c 100%); border-radius: 15px; color:white; margin-bottom:2rem; }
.icon-hero{ font-size:4rem; margin-bottom:1rem; display:block; }
.input-group-custom{ position:relative; margin-bottom:1.5rem; }
.input-group-custom .form-control{ border:2px solid #e9ecef; border-radius:10px; padding:12px 15px; font-size:1.1rem; transition:all .3s ease; }
.input-group-custom .form-control:focus{ border-color:#667eea; box-shadow:0 0 0 .2rem rgba(102,126,234,.25); }
.btn-calculate{ background: linear-gradient(45deg,#667eea,#764ba2); border:none; border-radius:10px; padding:12px 30px; font-size:1.1rem; font-weight:600; transition:all .3s ease; }
.btn-calculate:hover{ transform: translateY(-2px); box-shadow:0 10px 20px rgba(102,126,234,.3); }
.result-box{ background: linear-gradient(135deg,#667eea 0%,#764ba2 100%); border-radius:15px; padding:1.5rem; color:white; margin-top:1.5rem; }
.result-item{ background: rgba(255,255,255,.1); border-radius:10px; padding:1rem; margin-bottom:1rem; backdrop-filter: blur(10px); }
.result-value{ font-size:1.3rem; font-weight:700; }
.formula-card{ background: linear-gradient(135deg,#ffecd2 0%,#fcb69f 100%); border-radius:15px; border:none; }
.formula-item{ background: rgba(255,255,255,.7); border-radius:8px; padding:.8rem; margin-bottom:.5rem; font-size:.95rem; }
@media (max-width: 768px){ .prime-factorization{ padding:1rem 0; } .icon-hero{ font-size:3rem; } }