/* ── Variables ─────────────────────────────────────────────────────────────── */
:root {
    --green:          #00a884;
    --green-dark:     #008069;
    --green-light:    #d9fdd3;
    --bg-app:         #111b21;
    --bg-sidebar:     #111b21;
    --bg-panel:       #0b141a;
    --bg-input:       #1f2c34;
    --bg-card:        #202c33;
    --bg-card-hover:  #2a3942;
    --bg-msg-out:     #005c4b;
    --bg-msg-in:      #202c33;
    --bg-topbar:      #202c33;
    --border:         #2a3942;
    --text-primary:   #e9edef;
    --text-secondary: #8696a0;
    --text-muted:     #667781;
    --radius-msg:     8px;
    --radius-card:    10px;
    --topbar-h:       56px;
    --session-bar-h:  96px;
    --sidebar-w:      360px;
    --font:           -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

/* ── Reset ─────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
    font-family: var(--font);
    font-size: 14px;
    color: var(--text-primary);
    background: var(--bg-app);
}
a { color: inherit; text-decoration: none; }
button { cursor: pointer; border: none; background: none; font: inherit; color: inherit; }
input { font: inherit; color: inherit; }

/* ── Scrollbar ─────────────────────────────────────────────────────────────── */
::-webkit-scrollbar              { width: 6px; }
::-webkit-scrollbar-track        { background: transparent; }
::-webkit-scrollbar-thumb        { background: #374045; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover  { background: #4a5860; }

/* ═══════════════════════════════════════════════════════════════════════════
   LOGIN PAGE
═══════════════════════════════════════════════════════════════════════════ */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: var(--bg-app);
    overflow: auto;
}

.login-container {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 40px 36px;
    width: 100%;
    max-width: 380px;
}

.login-logo {
    text-align: center;
    margin-bottom: 32px;
    color: var(--green);
}
.login-logo svg { display: block; margin: 0 auto 12px; }
.login-logo h1  { font-size: 1.5rem; font-weight: 600; color: var(--text-primary); }
.login-logo p   { font-size: .85rem; color: var(--text-secondary); margin-top: 4px; }

.alert {
    padding: 10px 14px;
    border-radius: 6px;
    margin-bottom: 16px;
    font-size: .875rem;
}
.alert-error {
    background: rgba(234, 67, 53, .15);
    border: 1px solid rgba(234, 67, 53, .3);
    color: #f28b82;
}

.form-group          { margin-bottom: 16px; }
.form-group label    { display: block; font-size: .8rem; color: var(--text-secondary); margin-bottom: 6px; text-transform: uppercase; letter-spacing: .05em; }
.form-group input    { width: 100%; padding: 10px 14px; background: var(--bg-input); border: 1px solid var(--border); border-radius: 8px; color: var(--text-primary); transition: border-color .2s; outline: none; }
.form-group input:focus { border-color: var(--green); }

.btn { display: inline-flex; align-items: center; justify-content: center; gap: 6px; padding: 10px 20px; border-radius: 8px; font-size: .875rem; font-weight: 500; transition: background .2s, opacity .2s; cursor: pointer; border: none; }
.btn-primary  { background: var(--green); color: #fff; }
.btn-primary:hover { background: var(--green-dark); }
.btn-block    { width: 100%; padding: 12px; font-size: .95rem; }

/* ═══════════════════════════════════════════════════════════════════════════
   APP LAYOUT
═══════════════════════════════════════════════════════════════════════════ */
.app-body {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ── Topbar ────────────────────────────────────────────────────────────────── */
.topbar {
    height: var(--topbar-h);
    background: var(--bg-topbar);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    flex-shrink: 0;
    z-index: 100;
}

.topbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--green);
    font-size: 1.05rem;
    font-weight: 600;
}
.topbar-brand span { color: var(--text-primary); }

.topbar-user {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--text-secondary);
    font-size: .85rem;
}

.btn-logout {
    display: flex;
    align-items: center;
    padding: 6px;
    border-radius: 6px;
    color: var(--text-secondary);
    transition: color .2s, background .2s;
}
.btn-logout:hover { color: var(--text-primary); background: var(--bg-card-hover); }

/* ── Session bar ───────────────────────────────────────────────────────────── */
.session-bar {
    display: flex;
    gap: 12px;
    padding: 10px 16px;
    background: var(--bg-topbar);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    overflow-x: auto;
}

.session-card {
    flex: 1;
    min-width: 220px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius-card);
    padding: 10px 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
    transition: border-color .2s;
}
.session-card:has(.dot-green) { border-color: rgba(0, 168, 132, .35); }

.session-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.session-label {
    font-weight: 600;
    font-size: .9rem;
}

.session-status {
    display: flex;
    align-items: center;
    gap: 5px;
    font-size: .78rem;
    color: var(--text-secondary);
}

.session-actions { display: flex; gap: 6px; }

.btn-sm {
    padding: 4px 10px;
    font-size: .75rem;
    font-weight: 500;
    border-radius: 5px;
    transition: background .2s;
}
.btn-connect    { background: var(--green); color: #fff; }
.btn-connect:hover { background: var(--green-dark); }
.btn-disconnect { background: rgba(234, 67, 53, .2); color: #f28b82; border: 1px solid rgba(234,67,53,.3); }
.btn-disconnect:hover { background: rgba(234, 67, 53, .3); }

/* Status dots */
.dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; flex-shrink: 0; }
.dot-green  { background: var(--green); box-shadow: 0 0 6px var(--green); }
.dot-yellow { background: #f9c74f; box-shadow: 0 0 6px #f9c74f; }
.dot-grey   { background: var(--text-muted); }

/* QR container */
.qr-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 8px 0 2px;
}
.qr-container img {
    width: 160px;
    height: 160px;
    border-radius: 6px;
    background: #fff;
    padding: 4px;
}
.qr-hint {
    font-size: .75rem;
    color: var(--text-secondary);
}

/* ── Main layout ───────────────────────────────────────────────────────────── */
.main-layout {
    display: flex;
    flex: 1;
    overflow: hidden;
    min-height: 0;
}

/* ── Sidebar ───────────────────────────────────────────────────────────────── */
.sidebar {
    width: var(--sidebar-w);
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
    overflow: hidden;
}

/* Tabs */
.sidebar-tabs {
    display: flex;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.tab-btn {
    flex: 1;
    padding: 14px 0;
    font-size: .85rem;
    font-weight: 500;
    color: var(--text-secondary);
    border-bottom: 2px solid transparent;
    transition: color .2s, border-color .2s;
    text-align: center;
}
.tab-btn:hover  { color: var(--text-primary); background: var(--bg-card-hover); }
.tab-btn.active { color: var(--green); border-bottom-color: var(--green); }

/* Search */
.search-box {
    padding: 8px 12px;
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}
.search-box input {
    width: 100%;
    background: var(--bg-input);
    border: none;
    border-radius: 20px;
    padding: 8px 16px;
    font-size: .85rem;
    color: var(--text-primary);
    outline: none;
    transition: background .2s;
}
.search-box input::placeholder { color: var(--text-muted); }
.search-box input:focus { background: var(--bg-card-hover); }

/* Chat list */
.chat-list {
    flex: 1;
    overflow-y: auto;
}

.chat-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    cursor: pointer;
    border-bottom: 1px solid var(--border);
    transition: background .15s;
    position: relative;
}
.chat-item:hover  { background: var(--bg-card); }
.chat-item.active { background: var(--bg-card-hover); }

.chat-item-avatar {
    width: 46px;
    height: 46px;
    border-radius: 50%;
    background: var(--green-dark);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1.1rem;
    flex-shrink: 0;
}

.chat-item-body      { flex: 1; min-width: 0; }
.chat-item-header    { display: flex; justify-content: space-between; align-items: baseline; gap: 4px; margin-bottom: 3px; }
.chat-item-name      { font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-item-time      { font-size: .72rem; color: var(--text-muted); flex-shrink: 0; }
.chat-item-last      { font-size: .8rem; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.unread-badge {
    min-width: 18px;
    height: 18px;
    border-radius: 9px;
    background: var(--green);
    color: #fff;
    font-size: .7rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0 4px;
    flex-shrink: 0;
    align-self: flex-start;
    margin-top: 2px;
}

/* ── Chat panel ────────────────────────────────────────────────────────────── */
.chat-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    background: var(--bg-panel);
    overflow: hidden;
    min-width: 0;
    /* Fondo decorativo sutil */
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23182229' fill-opacity='0.4'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}

/* Chat header */
.chat-header {
    height: var(--topbar-h);
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 16px;
    gap: 12px;
    flex-shrink: 0;
    z-index: 10;
}
.chat-header-info {
    display: flex;
    align-items: center;
    gap: 12px;
}
.chat-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--green-dark);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: .95rem;
    flex-shrink: 0;
}
.chat-name  { font-weight: 500; font-size: .95rem; }
.chat-phone { font-size: .77rem; color: var(--text-secondary); }

/* Messages container */
.messages-container {
    flex: 1;
    overflow-y: auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-height: 0;
}

/* Messages */
.message {
    display: flex;
    margin-bottom: 2px;
}
.msg-out { justify-content: flex-end; }
.msg-in  { justify-content: flex-start; }

.msg-bubble {
    max-width: 65%;
    padding: 7px 10px 6px 10px;
    border-radius: var(--radius-msg);
    position: relative;
    word-break: break-word;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 4px 8px;
    line-height: 1.4;
}
.msg-out .msg-bubble {
    background: var(--bg-msg-out);
    border-bottom-right-radius: 2px;
}
.msg-in .msg-bubble {
    background: var(--bg-msg-in);
    border-bottom-left-radius: 2px;
}

.msg-text   { flex: 1; min-width: 0; font-size: .875rem; }
.msg-time   { font-size: .68rem; color: var(--text-muted); white-space: nowrap; flex-shrink: 0; align-self: flex-end; }
.msg-status { font-size: .72rem; color: var(--green); flex-shrink: 0; align-self: flex-end; }

/* Message input bar */
.message-input-bar {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 16px;
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    flex-shrink: 0;
}
.message-input-bar input {
    flex: 1;
    background: var(--bg-input);
    border: none;
    border-radius: 20px;
    padding: 10px 18px;
    font-size: .9rem;
    color: var(--text-primary);
    outline: none;
    transition: background .2s;
}
.message-input-bar input::placeholder { color: var(--text-muted); }
.message-input-bar input:focus        { background: var(--bg-card-hover); }

.btn-send {
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: var(--green);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background .2s, transform .1s;
}
.btn-send:hover  { background: var(--green-dark); }
.btn-send:active { transform: scale(.92); }

/* ── Load more ─────────────────────────────────────────────────────────────── */
.load-more-bar {
    display: flex;
    justify-content: center;
    padding: 10px 0 4px;
}
.load-more-bar button {
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-secondary);
    font-size: .78rem;
    padding: 5px 14px;
    border-radius: 12px;
    cursor: pointer;
    transition: background .2s, color .2s;
}
.load-more-bar button:hover:not(:disabled) { background: var(--bg-card-hover); color: var(--text-primary); }
.load-more-bar button:disabled { opacity: .5; cursor: default; }

/* ── Empty state ───────────────────────────────────────────────────────────── */
.empty-state {
    padding: 24px 16px;
    color: var(--text-muted);
    font-size: .85rem;
    text-align: center;
}
.empty-state.center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    flex: 1;
    height: 100%;
    gap: 12px;
    font-size: .9rem;
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
    :root { --sidebar-w: 100%; }

    .main-layout { position: relative; }

    .sidebar {
        position: absolute;
        left: 0; top: 0; bottom: 0;
        width: 100%;
        z-index: 10;
        transition: transform .25s ease;
    }
    .sidebar.hidden { transform: translateX(-100%); }

    .chat-panel {
        position: absolute;
        left: 0; top: 0; bottom: 0; right: 0;
    }

    .session-bar { flex-direction: column; height: auto; }
    .session-card { min-width: unset; }
}