/* ════════════════════════════════════════════════
   Chat with Lecture
   ════════════════════════════════════════════════ */

/* ═══════════════════════════════════════════════
   CHAT WITH LECTURE
   ═══════════════════════════════════════════════ */

/* Floating Action Button */
.chat-fab {
    position: fixed;
    bottom: 28px;
    right: 28px;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 14px 20px;
    border-radius: 50px;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 14px;
    font-weight: 600;
    font-family: inherit;
    box-shadow: 0 8px 32px rgba(139, 92, 246, 0.45);
    z-index: 300;
    transition: all 0.25s ease;
    white-space: nowrap;
}
.chat-fab:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(139, 92, 246, 0.6);
}
.chat-fab-icon { width: 20px; height: 20px; flex-shrink: 0; }
.chat-unread {
    position: absolute;
    top: -6px; right: -6px;
    width: 20px; height: 20px;
    border-radius: 50%;
    background: #ef4444;
    color: white;
    font-size: 11px;
    font-weight: 700;
    display: flex; align-items: center; justify-content: center;
}

/* Chat Panel */
.chat-panel {
    position: fixed;
    bottom: 90px;
    right: 28px;
    width: 380px;
    height: 560px;
    background: #0d0d20;
    border: 1px solid rgba(139, 92, 246, 0.25);
    border-radius: 20px;
    box-shadow: 0 24px 80px rgba(0,0,0,0.7);
    z-index: 299;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    animation: chatSlideUp 0.25s ease;
}
@keyframes chatSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* Panel header */
.chat-panel-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 18px;
    background: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(109,40,217,0.1));
    border-bottom: 1px solid rgba(139,92,246,0.15);
    flex-shrink: 0;
}
.chat-header-info {
    display: flex;
    align-items: center;
    gap: 10px;
}
.chat-avatar {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    display: flex; align-items: center; justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}
.chat-header-title { font-size: 14px; font-weight: 700; color: var(--text-primary); }
.chat-header-sub { font-size: 11px; color: var(--text-secondary); margin-top: 1px; }
.chat-close-btn {
    width: 30px; height: 30px;
    border-radius: 8px;
    border: none;
    background: rgba(255,255,255,0.06);
    color: var(--text-secondary);
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
}
.chat-close-btn:hover { background: rgba(255,255,255,0.12); color: var(--text-primary); }
.chat-close-btn svg { width: 16px; height: 16px; }

.chat-header-actions { display: flex; align-items: center; gap: 6px; }

.chat-clear-btn {
    width: 30px; height: 30px;
    border-radius: 8px;
    border: none;
    background: rgba(239,68,68,0.08);
    color: #f87171;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.15s;
}
.chat-clear-btn:hover { background: rgba(239,68,68,0.18); color: #ef4444; }
.chat-clear-btn svg { width: 15px; height: 15px; }

/* Messages area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    scroll-behavior: smooth;
}
.chat-messages::-webkit-scrollbar { width: 4px; }
.chat-messages::-webkit-scrollbar-track { background: transparent; }
.chat-messages::-webkit-scrollbar-thumb { background: rgba(139,92,246,0.3); border-radius: 2px; }

.chat-msg { display: flex; max-width: 88%; }
.chat-msg.user { align-self: flex-end; flex-direction: row-reverse; }
.chat-msg.assistant { align-self: flex-start; }

.chat-bubble {
    padding: 10px 14px;
    border-radius: 16px;
    font-size: 13px;
    line-height: 1.6;
    word-break: break-word;
}
.chat-msg.user .chat-bubble {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: white;
    border-bottom-right-radius: 4px;
}
.chat-msg.assistant .chat-bubble {
    background: rgba(255,255,255,0.06);
    color: var(--text-primary);
    border: 1px solid rgba(255,255,255,0.07);
    border-bottom-left-radius: 4px;
}

/* Typing indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    align-items: center;
    padding: 12px 16px !important;
}
.typing-indicator span {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--accent-light);
    animation: typingBounce 1.2s infinite;
}
.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typingBounce {
    0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
    30% { transform: translateY(-6px); opacity: 1; }
}

/* Timestamp links inside chat */
.chat-ts-link {
    display: inline-block;
    color: var(--accent-light);
    background: rgba(139,92,246,0.15);
    border-radius: 5px;
    padding: 0 5px;
    font-size: 12px;
    text-decoration: none;
    transition: background 0.15s;
    cursor: pointer;
}
.chat-ts-link:hover { background: rgba(139,92,246,0.3); }

/* Suggested questions */
.chat-suggestions {
    padding: 8px 14px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    border-top: 1px solid rgba(255,255,255,0.04);
    flex-shrink: 0;
}
.chat-suggestion-btn {
    font-size: 11px;
    padding: 5px 10px;
    border-radius: 20px;
    border: 1px solid rgba(139,92,246,0.3);
    background: rgba(139,92,246,0.08);
    color: var(--accent-light);
    cursor: pointer;
    font-family: inherit;
    transition: all 0.15s;
    white-space: nowrap;
}
.chat-suggestion-btn:hover {
    background: rgba(139,92,246,0.2);
    border-color: var(--accent);
}

/* Input area */
.chat-input-area {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 12px 14px;
    border-top: 1px solid rgba(255,255,255,0.06);
    flex-shrink: 0;
}
.chat-input {
    flex: 1;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.1);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 13px;
    font-family: inherit;
    padding: 10px 14px;
    resize: none;
    outline: none;
    line-height: 1.5;
    max-height: 120px;
    transition: border-color 0.2s;
    overflow-y: auto;
    scrollbar-width: none;        /* Firefox */
    -ms-overflow-style: none;     /* IE/Edge */
}
.chat-input::-webkit-scrollbar { display: none; }  /* Chrome/Safari */
.chat-input:focus { border-color: rgba(139,92,246,0.5); }
.chat-input::placeholder { color: var(--text-muted); }
.chat-send-btn {
    width: 38px; height: 38px;
    border-radius: 10px;
    background: var(--accent);
    border: none;
    color: white;
    cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
}
.chat-send-btn:hover:not(:disabled) { background: var(--accent-dark); transform: scale(1.05); }
.chat-send-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.chat-send-btn svg { width: 18px; height: 18px; }

/* Mobile: full-screen chat panel */
@media (max-width: 480px) {
    .chat-panel {
        bottom: 0; right: 0;
        width: 100%; height: 70vh;
        border-radius: 20px 20px 0 0;
    }
    .chat-fab { bottom: 16px; right: 16px; padding: 12px 16px; font-size: 13px; }
    .chat-fab-label { display: none; }
}