/* Outil Permutation — complément au style main.css (single-lesson-container) */

/* Icônes inline Material Icons */
.icon-inline { vertical-align: middle; font-size: inherit; }
.icon-inline.icon-sm { font-size: 1rem; }

/* Inputs */
.input-section { margin-bottom: 1.5rem; }

.input-group { margin-bottom: 1.2rem; }

.input-group label {
    display: block;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 0.5rem;
}

.input-group textarea,
.input-group input[type="number"] {
    width: 100%;
    padding: 0.9rem 1rem;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(0, 255, 65, 0.3);
    color: #fff;
    font-family: var(--font-mono);
    font-size: 1rem;
    border-radius: 12px;
    transition: all 0.3s;
    box-sizing: border-box;
}

.input-group textarea { min-height: 90px; resize: vertical; }

.input-group input[type="number"] { max-width: 160px; }

.input-group textarea::placeholder,
.input-group input::placeholder { color: rgba(255, 255, 255, 0.3); }

.input-group textarea:focus,
.input-group input[type="number"]:focus {
    outline: none;
    border-color: #00ff41;
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.3);
}

/* Bouton principal */
.btn-generate {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    padding: 0.85rem 2rem;
    background: rgba(0, 255, 65, 0.1);
    border: 1px solid #00ff41;
    color: #00ff41;
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 12px;
}

.btn-generate:hover {
    background: rgba(0, 255, 65, 0.2);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.4);
    transform: translateY(-2px);
}

/* Grid Container */
.grid-container {
    display: none;
    margin-top: 2rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(0, 255, 65, 0.2);
    border-radius: 16px;
}

.grid-container.show { display: block; }

.perm-instruction {
    color: rgba(255, 255, 255, 0.5);
    text-align: center;
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

/* Colonnes draggables */
.columns-container {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.column {
    background: rgba(15, 20, 35, 0.9);
    border: 1px solid rgba(0, 255, 65, 0.3);
    border-radius: 10px;
    padding: 0.7rem 1rem;
    min-width: 56px;
    cursor: grab;
    transition: all 0.3s;
}

.column:hover {
    border-color: #00ff41;
    transform: translateY(-4px);
    box-shadow: 0 4px 15px rgba(0, 255, 65, 0.3);
}

.column:active { cursor: grabbing; }

.column.dragging { opacity: 0.4; transform: rotate(3deg); }

.column.drag-over {
    border-color: #00ff41;
    background: rgba(0, 255, 65, 0.1);
    box-shadow: 0 0 20px rgba(0, 255, 65, 0.4);
}

.column-header {
    font-family: var(--font-display);
    color: #00ff41;
    font-weight: 700;
    font-size: 0.8rem;
    text-align: center;
    margin-bottom: 0.5rem;
    padding-bottom: 0.4rem;
    border-bottom: 1px solid rgba(0, 255, 65, 0.2);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.column-content {
    font-family: var(--font-mono);
    color: #fff;
    font-size: 1rem;
    line-height: 1.8;
    text-align: center;
}

.column-letter { display: block; padding: 2px 0; }

/* Résultat */
.result-section {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background: rgba(0, 255, 65, 0.05);
    border-left: 4px solid #00ff41;
    border-radius: 0 12px 12px 0;
}

.result-section h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: #00ff41;
    margin-bottom: 0.8rem;
}

.result-text {
    font-family: var(--font-mono);
    color: #00ff41;
    font-size: 1.1rem;
    line-height: 1.6;
    word-break: break-word;
    padding: 1rem;
    background: rgba(0, 0, 0, 0.4);
    border-radius: 8px;
    text-shadow: 0 0 10px rgba(0, 255, 65, 0.3);
}

/* Boutons contrôle */
.controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
}

.btn-control {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.7rem 1.5rem;
    background: transparent;
    border: 1px solid rgba(0, 255, 65, 0.3);
    color: #00ff41;
    font-family: var(--font-display);
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border-radius: 10px;
}

.btn-control:hover {
    background: rgba(0, 255, 65, 0.1);
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.3);
    transform: translateY(-2px);
}

.btn-reset { border-color: rgba(255, 60, 60, 0.3); color: #ff3c3c; }

.btn-reset:hover {
    background: rgba(255, 60, 60, 0.1);
    box-shadow: 0 0 15px rgba(255, 60, 60, 0.3);
}

/* Responsive */
@media (max-width: 768px) {
    .columns-container { gap: 8px; padding: 1rem; }
    .column { min-width: 48px; padding: 0.5rem 0.7rem; }
    .controls { flex-direction: column; }
    .btn-control { width: 100%; justify-content: center; }
}