/* ============================================================
   AI Tutor — Floating AI assistant across all studios.
   ============================================================ */

.ai-tutor-fab {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 48px;
    height: 48px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: #FFF;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    z-index: var(--z-overlay);
    transition: transform var(--transition-fast), background var(--transition-fast);
}
.ai-tutor-fab:hover { transform: scale(1.05); background: var(--color-primary-hover); }

.ai-tutor-panel {
    position: fixed;
    bottom: calc(var(--space-6) + 56px);
    right: var(--space-6);
    width: 380px;
    max-height: 500px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    z-index: var(--z-overlay);
    display: none;
    flex-direction: column;
    overflow: hidden;
}
.ai-tutor-panel.open { display: flex; }

.ai-tutor-panel__header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    border-bottom: 1px solid var(--color-border);
}
.ai-tutor-panel__title {
    font-weight: var(--font-semibold);
    font-size: var(--text-sm);
}
.ai-tutor-panel__close {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    color: var(--color-text-secondary);
}
.ai-tutor-panel__close:hover { background: var(--color-bg-tertiary); }
.ai-tutor-panel__close .material-symbols-outlined { font-size: 18px; }

.ai-tutor-panel__messages {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-3);
    min-height: 200px;
}
.ai-tutor-panel__input-wrap {
    display: flex;
    gap: var(--space-2);
    padding: var(--space-3);
    border-top: 1px solid var(--color-border);
}
.ai-tutor-panel__input {
    flex: 1;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    background: var(--color-bg);
    color: var(--color-text);
    resize: none;
    outline: none;
}
.ai-tutor-panel__input:focus { border-color: var(--color-primary); }
.ai-tutor-panel__send {
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-primary);
    color: #FFF;
    border-radius: var(--radius-md);
    flex-shrink: 0;
}
.ai-tutor-panel__send:hover { background: var(--color-primary-hover); }

@media (max-width: 768px) {
    .ai-tutor-panel {
        right: var(--space-3);
        left: var(--space-3);
        width: auto;
        bottom: calc(var(--space-6) + 56px + 52px);
        max-height: 60vh;
    }
    .ai-tutor-fab {
        bottom: calc(var(--space-3) + 52px);
        right: var(--space-3);
    }
}