/* ============================================
   AI Chat Assistant — Paradigma
   Использует design-tokens.css (data-theme)
   ============================================ */

/* === Toggle Button === */
.ai-chat-toggle {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    z-index: 9998;
    width: 52px;
    height: 52px;
    border-radius: var(--radius-full);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-blue);
    color: #fff;
    box-shadow: var(--shadow-md);
    transition: transform var(--duration-normal) var(--ease-default),
                box-shadow var(--duration-normal) var(--ease-default);
}
.ai-chat-toggle:hover {
    transform: scale(1.08);
    box-shadow: var(--shadow-lg);
}

/* === Overlay === */
.ai-chat-overlay {
    position: fixed;
    inset: 0;
    background: var(--bg-overlay);
    z-index: 9998;
}

/* === Panel === */
.ai-chat-panel {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 380px;
    max-width: 100vw;
    z-index: 9999;
    display: flex;
    flex-direction: column;
    background: var(--bg-surface);
    color: var(--text-primary);
    box-shadow: -4px 0 24px rgba(0, 0, 0, 0.2);
    animation: ai-chat-slide-in 0.25s var(--ease-out);
}

@keyframes ai-chat-slide-in {
    from { transform: translateX(100%); }
    to { transform: translateX(0); }
}

/* === Header === */
.ai-chat-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    flex-shrink: 0;
    border-bottom: 1px solid var(--border-default);
}
.ai-chat-header__title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-h3);
    font-weight: var(--weight-semibold);
    color: var(--text-primary);
}
.ai-chat-header__actions {
    display: flex;
    gap: var(--space-1);
}
.ai-chat-header__btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    color: var(--text-secondary);
    transition: background var(--duration-fast) var(--ease-default);
}
.ai-chat-header__btn:hover {
    background: var(--bg-elevated);
}

/* === Body === */
.ai-chat-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4) var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

/* === Empty state === */
.ai-chat-empty {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    text-align: center;
    color: var(--text-muted);
}
.ai-chat-empty p {
    margin: 0;
    font-size: var(--font-body);
}
.ai-chat-empty__hint {
    font-size: var(--font-caption) !important;
    opacity: 0.7;
}

/* === Messages === */
.ai-chat-msg {
    max-width: 85%;
    word-wrap: break-word;
}
.ai-chat-msg--user {
    align-self: flex-end;
}
.ai-chat-msg--assistant {
    align-self: flex-start;
}
.ai-chat-msg__content {
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-lg);
    font-size: var(--font-body);
    line-height: var(--lh-normal);
}

/* User message: accent blue */
.ai-chat-msg--user .ai-chat-msg__content {
    background: var(--accent-blue);
    color: #fff;
}

/* Assistant message: elevated surface */
.ai-chat-msg--assistant .ai-chat-msg__content {
    background: var(--bg-elevated);
    color: var(--text-primary);
}

/* === Loading dots === */
.ai-chat-msg__loading {
    display: flex;
    gap: var(--space-1);
    padding: var(--space-3) var(--space-5);
}
.ai-chat-dot {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--accent-blue);
    animation: ai-chat-bounce 1.2s infinite;
}
.ai-chat-dot:nth-child(2) { animation-delay: 0.15s; }
.ai-chat-dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes ai-chat-bounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* === Loading hint text === */
.ai-chat-loading-hint {
    font-size: var(--font-caption);
    color: var(--text-muted);
    text-align: center;
    padding: var(--space-1) 0;
}

/* === Footer / Input === */
.ai-chat-footer {
    padding: var(--space-3) var(--space-4);
    flex-shrink: 0;
    border-top: 1px solid var(--border-default);
}
.ai-chat-form {
    display: flex;
    gap: var(--space-2);
    align-items: center;
}
.ai-chat-input {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-default);
    border: 1px solid var(--border-default);
    background: var(--bg-deep);
    color: var(--text-primary);
    font-size: var(--font-body);
    font-family: var(--font-family);
    outline: none;
    transition: border-color var(--duration-fast) var(--ease-default);
}
.ai-chat-input:focus {
    border-color: var(--border-focus);
}
.ai-chat-input::placeholder {
    color: var(--text-muted);
}
.ai-chat-send {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-default);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: var(--accent-blue);
    color: #fff;
    transition: opacity var(--duration-fast) var(--ease-default);
}
.ai-chat-send:hover {
    background: var(--accent-blue-dark);
}
.ai-chat-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* === Scrollbar === */
.ai-chat-body::-webkit-scrollbar {
    width: 6px;
}
.ai-chat-body::-webkit-scrollbar-track {
    background: transparent;
}
.ai-chat-body::-webkit-scrollbar-thumb {
    background: var(--border-default);
    border-radius: 3px;
}
.ai-chat-body::-webkit-scrollbar-thumb:hover {
    background: var(--border-hover);
}