:root {
    --azul: #136BA9;
    --azul-claro: #0A7ED0;
    --azul-fundo: #eef5fb;
    --azul-suave: #dcecf8;
    --texto: #16293b;
    --texto-fraco: #5f7285;
    --borda: #e3ebf2;
    --degrade: linear-gradient(135deg, #136BA9 0%, #0A7ED0 100%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background: #fff;
    min-height: 100vh;
    overflow: hidden;
    color: var(--texto);
}

/* ---------- Cartão principal ---------- */
.chat-container {
    height: 100vh;
    height: 100dvh;
    display: flex;
    flex-direction: column;
    background: #fff;
    overflow: hidden;
}

.header {
    background: #fff;
    padding: 0.9rem 1.5rem;
    border-bottom: 1px solid var(--borda);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header h1 {
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--texto);
}

.header .btn {
    border-radius: 10px;
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0 !important;
    border-color: var(--borda);
    color: var(--texto-fraco);
    transition: background 0.2s, color 0.2s, border-color 0.2s;
}

.header .btn:hover {
    background: var(--azul-fundo);
    border-color: var(--azul);
    color: var(--azul);
}

.main-content {
    flex: 1;
    display: flex;
    overflow: hidden;
}

/* ---------- Lista de conversas ---------- */
.sidebar {
    width: 340px;
    background: #fff;
    border-right: 1px solid var(--borda);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 1.25rem 1.5rem 1rem;
}

.sidebar-header h2 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--texto);
}

.conversations {
    flex: 1;
    overflow-y: auto;
    padding: 0 0.6rem 0.8rem;
}

.conversation {
    padding: 0.85rem 0.9rem;
    margin-bottom: 0.2rem;
    cursor: pointer;
    border-radius: 14px;
    display: flex;
    align-items: center;
    position: relative;
    transition: background 0.18s ease;
}

.conversation:hover { background: var(--azul-fundo); }

.conversation.active { background: var(--azul-suave); }

.conversation.active::before {
    content: '';
    position: absolute;
    left: 0;
    top: 22%;
    bottom: 22%;
    width: 3px;
    border-radius: 3px;
    background: var(--azul);
}

.conv-avatar {
    flex: 0 0 46px;
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--degrade);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.9rem;
    font-weight: 600;
    margin-right: 0.8rem;
    box-shadow: 0 3px 8px rgba(19, 107, 169, 0.3);
}

.conv-info { flex: 1; min-width: 0; }

.conv-name {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--texto);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-product {
    display: inline-block;
    max-width: 100%;
    margin: 0.15rem 0 0.2rem;
    padding: 0.08rem 0.5rem;
    border-radius: 999px;
    background: var(--azul-suave);
    color: var(--azul);
    font-size: 0.7rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conversation.active .conv-product { background: #fff; }

.conv-last-msg {
    font-size: 0.8rem;
    color: var(--texto-fraco);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.conv-time {
    font-size: 0.7rem;
    color: var(--texto-fraco);
    margin-top: 0.15rem;
}

.badge-novas {
    background: var(--azul);
    color: #fff;
    font-size: 0.7rem;
    font-weight: 700;
    min-width: 22px;
    height: 22px;
    padding: 0 6px;
    border-radius: 11px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 0.5rem;
}

/* ---------- Área do chat ---------- */
.chat-area {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.chat-header {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--borda);
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: #fff;
}

.chat-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--texto);
}

.chat-product {
    font-size: 0.78rem;
    color: var(--azul);
    font-weight: 500;
}

.back-btn {
    display: none;
    background: var(--azul-fundo);
    border: none;
    border-radius: 10px;
    width: 36px;
    height: 36px;
    color: var(--azul);
    font-size: 1rem;
    cursor: pointer;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    background: var(--azul-fundo);
    display: flex;
    flex-direction: column;
    gap: 0.55rem;
}

.empty-state {
    margin: auto;
    max-width: 260px;
    color: var(--texto-fraco);
    font-size: 0.9rem;
    line-height: 1.5;
    text-align: center;
}

.message {
    max-width: 68%;
    padding: 0.65rem 0.95rem 0.5rem;
    font-size: 0.92rem;
    line-height: 1.45;
    overflow-wrap: anywhere;
    animation: entrar 0.18s ease-out;
}

.message.enviada {
    align-self: flex-end;
    background: var(--degrade);
    color: #fff;
    border-radius: 18px 18px 4px 18px;
    box-shadow: 0 3px 10px rgba(19, 107, 169, 0.25);
}

.message.recebida {
    align-self: flex-start;
    background: #fff;
    color: var(--texto);
    border-radius: 18px 18px 18px 4px;
    box-shadow: 0 2px 6px rgba(22, 41, 59, 0.08);
}

.message-time {
    font-size: 0.66rem;
    opacity: 0.7;
    margin-top: 0.2rem;
    text-align: right;
}

@keyframes entrar {
    from { opacity: 0; transform: translateY(6px); }
    to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Campo de digitar ---------- */
.input-container {
    padding: 1rem 1.5rem;
    background: #fff;
    border-top: 1px solid var(--borda);
}

.input-wrapper {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.message-input {
    flex: 1;
    padding: 0.85rem 1.2rem;
    border: 1px solid var(--borda);
    border-radius: 999px;
    font-family: inherit;
    font-size: 0.92rem;
    color: var(--texto);
    outline: none;
    background: var(--azul-fundo);
    transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
}

.message-input::placeholder { color: #8a9bab; }

.message-input:focus {
    border-color: var(--azul);
    box-shadow: 0 0 0 4px rgba(19, 107, 169, 0.14);
    background: #fff;
}

.message-input:disabled { cursor: not-allowed; opacity: 0.7; }

.send-btn {
    width: 46px;
    height: 46px;
    border: none;
    border-radius: 50%;
    background: var(--degrade);
    color: #fff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform 0.18s ease, box-shadow 0.18s ease;
}

.send-btn:hover:not(:disabled) {
    transform: scale(1.06);
    box-shadow: 0 6px 16px rgba(19, 107, 169, 0.4);
}

.send-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
}

.send-btn:focus-visible,
.back-btn:focus-visible,
.conversation:focus-visible {
    outline: 3px solid rgba(19, 107, 169, 0.45);
    outline-offset: 2px;
}

/* ---------- Barras de rolagem ---------- */
.conversations::-webkit-scrollbar,
.messages::-webkit-scrollbar { width: 6px; }

.conversations::-webkit-scrollbar-track,
.messages::-webkit-scrollbar-track { background: transparent; }

.conversations::-webkit-scrollbar-thumb,
.messages::-webkit-scrollbar-thumb {
    background: #c3d3e0;
    border-radius: 3px;
}

.conversations::-webkit-scrollbar-thumb:hover,
.messages::-webkit-scrollbar-thumb:hover { background: #9fb5c7; }

/* ---------- Celular ---------- */
@media (max-width: 768px) {
    .chat-container {
        height: 100vh;
        height: 100dvh;
        margin: 0;
        border-radius: 0;
        box-shadow: none;
    }

    .header { padding: 0.8rem 1rem; }

    .sidebar { width: 100%; border-right: 0; }
    .chat-area { display: none; }

    .main-content.chat-open .sidebar { display: none; }
    .main-content.chat-open .chat-area { display: flex; }

    .back-btn { display: block; }
    .message { max-width: 85%; }
    .messages { padding: 1rem; }
    .chat-header, .input-container { padding: 0.8rem 1rem; }
}

@media (prefers-reduced-motion: reduce) {
    .message { animation: none; }
    .send-btn, .conversation, .message-input { transition: none; }
}