/* Bouton flottant */
#usc-chat-toggle {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border: none;
    cursor: pointer;
    box-shadow: 0 8px 25px rgba(99,102,241,0.45);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: transform .2s, box-shadow .2s;
}
#usc-chat-toggle:hover { transform: scale(1.1); box-shadow: 0 12px 32px rgba(99,102,241,0.55); }
#usc-chat-toggle i { color: #fff; font-size: 1.4rem; transition: transform .3s; }
#usc-chat-toggle.open i { transform: rotate(90deg); }

/* Badge notification */
#usc-chat-badge {
    position: absolute;
    top: -4px; right: -4px;
    background: #ef4444;
    color: #fff;
    font-size: .65rem;
    font-weight: 700;
    border-radius: 50%;
    width: 20px; height: 20px;
    display: flex; align-items: center; justify-content: center;
    border: 2px solid #fff;
    animation: badgePulse 2s infinite;
}
@keyframes badgePulse { 0%,100%{transform:scale(1)} 50%{transform:scale(1.15)} }

/* Fenêtre chat */
#usc-chatbot {
    position: fixed;
    bottom: 100px;
    right: 28px;
    width: 340px;
    max-width: calc(100vw - 40px);
    background: #fff;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,.18);
    z-index: 9998;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    transform: scale(.85) translateY(20px);
    opacity: 0;
    pointer-events: none;
    transition: transform .25s cubic-bezier(.34,1.56,.64,1), opacity .2s;
}
#usc-chatbot.open {
    transform: scale(1) translateY(0);
    opacity: 1;
    pointer-events: all;
}

/* Header */
.usc-cb-header {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    padding: 16px 18px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.usc-cb-avatar {
    width: 40px; height: 40px;
    background: rgba(255,255,255,.2);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.usc-cb-avatar i { color: #fff; font-size: 1.1rem; }
.usc-cb-info { flex: 1; }
.usc-cb-name { color: #fff; font-weight: 700; font-size: .95rem; margin: 0; }
.usc-cb-status { color: rgba(255,255,255,.8); font-size: .75rem; display: flex; align-items: center; gap: 5px; }
.usc-cb-dot { width: 7px; height: 7px; background: #4ade80; border-radius: 50%; animation: dotBlink 2s infinite; }
@keyframes dotBlink { 0%,100%{opacity:1} 50%{opacity:.4} }

/* Zone messages */
.usc-cb-messages {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    max-height: 320px;
    background: #f8fafc;
}
.usc-cb-messages::-webkit-scrollbar { width: 4px; }
.usc-cb-messages::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }

/* Bulles */
.usc-msg {
    display: flex;
    gap: 8px;
    align-items: flex-end;
    animation: msgIn .2s ease;
}
@keyframes msgIn { from{opacity:0;transform:translateY(8px)} to{opacity:1;transform:none} }
.usc-msg.user { flex-direction: row-reverse; }
.usc-msg-bubble {
    max-width: 82%;
    padding: 10px 14px;
    border-radius: 16px;
    font-size: .85rem;
    line-height: 1.5;
}
.usc-msg.bot .usc-msg-bubble {
    background: #fff;
    color: #1e293b;
    border-bottom-left-radius: 4px;
    box-shadow: 0 1px 4px rgba(0,0,0,.07);
}
.usc-msg.user .usc-msg-bubble {
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    color: #fff;
    border-bottom-right-radius: 4px;
}
.usc-msg-ico {
    width: 28px; height: 28px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}
.usc-msg-ico i { color: #fff; font-size: .7rem; }

/* Suggestions rapides */
.usc-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    padding: 0 16px 10px;
    background: #f8fafc;
}
.usc-sugg-btn {
    background: #fff;
    border: 1.5px solid #e2e8f0;
    border-radius: 20px;
    padding: 5px 12px;
    font-size: .75rem;
    color: #6366f1;
    cursor: pointer;
    transition: all .15s;
    font-weight: 500;
}
.usc-sugg-btn:hover { background: #6366f1; color: #fff; border-color: #6366f1; }

/* Input */
.usc-cb-input-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    background: #fff;
    border-top: 1px solid #e2e8f0;
}
#usc-cb-input {
    flex: 1;
    border: 1.5px solid #e2e8f0;
    border-radius: 20px;
    padding: 9px 14px;
    font-size: .85rem;
    outline: none;
    transition: border-color .15s;
    resize: none;
    font-family: inherit;
}
#usc-cb-input:focus { border-color: #6366f1; }
#usc-cb-send {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    border: none;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer;
    transition: transform .15s;
    flex-shrink: 0;
}
#usc-cb-send:hover { transform: scale(1.1); }
#usc-cb-send i { color: #fff; font-size: .85rem; }

/* Typing indicator */
.usc-typing .usc-msg-bubble {
    padding: 12px 16px;
    display: flex; gap: 4px; align-items: center;
}
.usc-typing-dot {
    width: 6px; height: 6px;
    background: #94a3b8;
    border-radius: 50%;
    animation: typDot .9s infinite;
}
.usc-typing-dot:nth-child(2) { animation-delay: .15s; }
.usc-typing-dot:nth-child(3) { animation-delay: .3s; }
@keyframes typDot { 0%,60%,100%{transform:translateY(0)} 30%{transform:translateY(-6px)} }

/* Dark mode */
[data-theme="dark"] #usc-chatbot { background: #1e293b; }
[data-theme="dark"] .usc-cb-messages { background: #0f172a; }
[data-theme="dark"] .usc-msg.bot .usc-msg-bubble { background: #1e293b; color: #e2e8f0; }
[data-theme="dark"] .usc-cb-input-wrap { background: #1e293b; border-color: #334155; }
[data-theme="dark"] #usc-cb-input { background: #0f172a; color: #e2e8f0; border-color: #334155; }
[data-theme="dark"] .usc-sugg-btn { background: #1e293b; border-color: #334155; color: #a5b4fc; }
[data-theme="dark"] .usc-suggestions { background: #0f172a; }

@media (max-width: 480px) {
    #usc-chatbot { right: 12px; bottom: 90px; width: calc(100vw - 24px); }
    #usc-chat-toggle { right: 16px; bottom: 20px; }
}