:root {
    --brand-primary: #4f46e5;
    --brand-primary-dark: #3730a3;
    --brand-accent: #0ea5e9;
    --wa-green: #25D366;
    --wa-green-dark: #128C7E;
    --wa-teal: #075E54;
    --sidebar-width: 250px;
    --sidebar-bg: #111827;
    --sidebar-bg-active: #1f2a44;
    --bg-body: #f3f4f8;
    --panel-border: #e5e7eb;
    --panel-bg: #ffffff;
    --text-heading: #111827;
    --text-muted: #6b7280;
    --radius-lg: .85rem;
    --radius-md: .65rem;
    --shadow-card: 0 1px 3px rgba(16, 24, 40, .08), 0 1px 2px rgba(16, 24, 40, .04);
}

[data-bs-theme="dark"] {
    --bg-body: #0f1420;
    --panel-border: #26304a;
    --panel-bg: #161d2e;
    --text-heading: #e5e7eb;
    --text-muted: #9aa4bf;
    --shadow-card: 0 1px 3px rgba(0, 0, 0, .5);
}

* { box-sizing: border-box; }

body {
    background-color: var(--bg-body);
    color: var(--text-heading);
    font-family: "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    transition: background-color .2s ease, color .2s ease;
}

a { text-decoration: none; }

.app-wrapper { display: flex; min-height: 100vh; }

.auth-body { background: linear-gradient(135deg, var(--brand-primary-dark), var(--wa-teal)); min-height: 100vh; }
.auth-wrapper { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 1.5rem; }
.auth-card { background: #fff; border-radius: 1rem; padding: 2.25rem 2rem; width: 100%; max-width: 400px; box-shadow: 0 10px 40px rgba(0,0,0,.25); }
.auth-card-brand { display: flex; align-items: center; justify-content: center; gap: .5rem; font-weight: 700; font-size: 1.15rem; color: var(--brand-primary-dark); margin-bottom: .5rem; }
.auth-card-brand i { font-size: 1.6rem; color: var(--wa-green); }

.sidebar {
    width: var(--sidebar-width);
    background: var(--sidebar-bg);
    color: #fff;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 0;
    height: 100vh;
    z-index: 1040;
}

.sidebar-brand {
    display: flex; align-items: center; gap: .5rem;
    padding: 1.15rem 1.25rem;
    font-weight: 600; font-size: 1.1rem;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.sidebar-brand i { font-size: 1.4rem; color: var(--wa-green); }

.sidebar-nav { list-style: none; margin: 0; padding: .75rem; flex-grow: 1; overflow-y: auto; }
.sidebar-divider { border-top: 1px solid rgba(255,255,255,.1); margin: .5rem .25rem; }

.sidebar-nav li a {
    display: flex; align-items: center; gap: .65rem;
    color: rgba(255,255,255,.75);
    padding: .6rem .85rem;
    border-radius: .5rem;
    margin-bottom: .2rem;
    font-size: .9rem;
    transition: background .15s ease, color .15s ease;
}
.sidebar-nav li a i { width: 18px; text-align: center; }
.sidebar-nav li a:hover { background: rgba(255,255,255,.08); color: #fff; }
.sidebar-nav li a.active { background: var(--brand-primary); color: #fff; font-weight: 600; }

.main-panel { flex-grow: 1; min-width: 0; display: flex; flex-direction: column; }

.topbar {
    background: var(--panel-bg);
    border-bottom: 1px solid var(--panel-border);
    padding: .65rem 1.25rem;
    position: sticky;
    top: 0;
    z-index: 1030;
    gap: .75rem;
}

.topbar-title { font-weight: 600; font-size: 1.05rem; color: var(--text-heading); margin-left: .25rem; white-space: nowrap; }
.small-dot { font-size: .5rem; vertical-align: middle; }

.topbar-search { position: relative; flex-grow: 1; max-width: 360px; margin-left: 1rem; }
.topbar-search i { position: absolute; left: .65rem; top: 50%; transform: translateY(-50%); color: var(--text-muted); font-size: .85rem; }
.topbar-search input { padding-left: 2rem; }

.btn-icon { display: inline-flex; align-items: center; justify-content: center; width: 34px; height: 34px; border-radius: 50%; border: none; background: transparent; color: var(--text-heading); }
.btn-icon:hover { background: rgba(79,70,229,.1); }
.topbar-user { color: var(--text-heading) !important; }
.topbar-user i { font-size: 1.5rem; color: var(--brand-primary); }

.content-area { padding: 1.5rem; flex-grow: 1; }

.app-footer {
    padding: .65rem 1.5rem;
    font-size: .78rem;
    color: var(--text-muted);
    border-top: 1px solid var(--panel-border);
    background: var(--panel-bg);
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
}
.footer-sep { opacity: .5; }

.stat-card {
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    padding: 1.1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-card);
    height: 100%;
    transition: transform .15s ease, box-shadow .15s ease;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: 0 8px 20px rgba(16,24,40,.1); }

.stat-icon { width: 52px; height: 52px; border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center; font-size: 1.4rem; flex-shrink: 0; }
.stat-value { font-size: 1.55rem; font-weight: 700; line-height: 1; color: var(--text-heading); }
.stat-label { color: var(--text-muted); font-size: .8rem; margin-top: .2rem; }

.kpi-section-title {
    font-size: .78rem;
    font-weight: 700;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--text-muted);
    margin: 1.5rem 0 .75rem;
}
.kpi-section-title:first-child { margin-top: 0; }

.dashboard-panel {
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    box-shadow: var(--shadow-card);
}

.panel-title { font-weight: 600; color: var(--text-heading); margin-bottom: 1rem; display: flex; align-items: center; gap: .5rem; }
.today-count { font-size: 2.5rem; font-weight: 700; color: var(--brand-primary); }

.avatar-lg { width: 84px; height: 84px; border-radius: 50%; background: #e5e7eb; display: flex; align-items: center; justify-content: center; font-size: 2.2rem; color: #6b7280; }
[data-bs-theme="dark"] .avatar-lg { background: #26304a; color: #9aa4bf; }

.filter-bar {
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 1rem 1.25rem;
    margin-bottom: 1.25rem;
}
.filter-bar label { font-size: .72rem; text-transform: uppercase; letter-spacing: .03em; color: var(--text-muted); font-weight: 600; margin-bottom: .25rem; }

.chart-card { background: var(--panel-bg); border-radius: var(--radius-lg); padding: 1.25rem; box-shadow: var(--shadow-card); height: 100%; }
.chart-card canvas { max-height: 280px; }
.chart-card-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; flex-wrap: wrap; gap: .5rem; }

.skeleton { position: relative; overflow: hidden; background: #e5e7eb; border-radius: .35rem; }
[data-bs-theme="dark"] .skeleton { background: #26304a; }
.skeleton::after {
    content: "";
    position: absolute; inset: 0;
    transform: translateX(-100%);
    background: linear-gradient(90deg, transparent, rgba(255,255,255,.5), transparent);
    animation: skeleton-shimmer 1.4s infinite;
}
[data-bs-theme="dark"] .skeleton::after { background: linear-gradient(90deg, transparent, rgba(255,255,255,.08), transparent); }
@keyframes skeleton-shimmer { 100% { transform: translateX(100%); } }
.skeleton-line { height: .85rem; margin-bottom: .5rem; }
.skeleton-row td { padding: .9rem .75rem; }

.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); }
.empty-state i { font-size: 3rem; color: #d1d5db; margin-bottom: .75rem; display: block; }
[data-bs-theme="dark"] .empty-state i { color: #374151; }

.table-pro thead th {
    font-size: .72rem; text-transform: uppercase; letter-spacing: .03em;
    color: var(--text-muted); border-bottom-width: 1px; white-space: nowrap;
}
.table-pro th.sortable { cursor: pointer; user-select: none; }
.table-pro th.sortable:hover { color: var(--brand-primary); }
.table-pro th.sortable i { font-size: .7rem; margin-left: .2rem; opacity: .6; }
.table-pro td { vertical-align: middle; }

.pagination-bar { display: flex; align-items: center; justify-content: space-between; margin-top: 1rem; flex-wrap: wrap; gap: .5rem; }

.chat-shell {
    display: flex;
    height: calc(100vh - 165px);
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.chat-list-panel { width: 340px; flex-shrink: 0; border-right: 1px solid var(--panel-border); display: flex; flex-direction: column; }
.chat-list-header { padding: .85rem; border-bottom: 1px solid var(--panel-border); position: sticky; top: 0; background: var(--panel-bg); z-index: 5; }
.search-form { position: relative; }
.search-form i { position: absolute; left: .65rem; top: 50%; transform: translateY(-50%); color: var(--text-muted); }
.search-form input { padding-left: 2rem; }

.chat-list { flex-grow: 1; overflow-y: auto; }
.chat-list-section-label { padding: .5rem 1rem; font-size: .68rem; text-transform: uppercase; letter-spacing: .04em; color: var(--text-muted); font-weight: 700; background: var(--bg-body); }

.chat-list-item {
    display: flex; align-items: center; gap: .75rem;
    padding: .75rem 1rem;
    cursor: pointer;
    border-bottom: 1px solid var(--panel-border);
    transition: background .1s ease;
    position: relative;
}
.chat-list-item:hover { background: rgba(79,70,229,.05); }
.chat-list-item:hover .pin-toggle-btn { opacity: 1; }
.chat-list-item.active { background: rgba(37,211,102,.1); }

.pin-toggle-btn { opacity: 0; flex-shrink: 0; width: 28px; height: 28px; font-size: .85rem; color: var(--text-muted); }
.pin-toggle-btn:hover { color: var(--wa-green-dark); background: rgba(37,211,102,.15); }

.avatar { width: 44px; height: 44px; border-radius: 50%; background: #e5e7eb; display: flex; align-items: center; justify-content: center; color: #6b7280; font-size: 1.2rem; flex-shrink: 0; }
[data-bs-theme="dark"] .avatar { background: #26304a; color: #9aa4bf; }

.chat-list-info { min-width: 0; flex-grow: 1; }
.contact-name { font-weight: 600; font-size: .92rem; color: var(--text-heading); }
.contact-time { font-size: .75rem; color: var(--text-muted); }
.contact-last-message { font-size: .82rem; color: var(--text-muted); max-width: 190px; }
.contact-phone-small { font-size: .72rem; color: var(--text-muted); }
.unread-badge { font-size: .7rem; flex-shrink: 0; margin-left: .4rem; }

.chat-window-panel { flex-grow: 1; display: flex; flex-direction: column; min-width: 0; }
.chat-empty-state { flex-grow: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; color: var(--text-muted); }
.chat-empty-state i { font-size: 3.5rem; color: #d1d5db; margin-bottom: .5rem; }

.chat-window { flex-grow: 1; display: flex; flex-direction: column; min-height: 0; }
.chat-window-header { display: flex; align-items: center; gap: .75rem; padding: .75rem 1.1rem; border-bottom: 1px solid var(--panel-border); position: sticky; top: 0; background: var(--panel-bg); z-index: 5; }

.chat-messages { flex-grow: 1; overflow-y: auto; padding: 1.25rem; background: #efeae2; background-image: linear-gradient(180deg, #f7f4ef, #e9e4da); scroll-behavior: smooth; }
[data-bs-theme="dark"] .chat-messages { background: #0b0f19; background-image: linear-gradient(180deg, #0d1220, #0a0e18); }

.msg-bubble { max-width: 60%; padding: .5rem .75rem; border-radius: .65rem; margin-bottom: .6rem; font-size: .9rem; line-height: 1.35; position: relative; box-shadow: 0 1px 1px rgba(0,0,0,.08); word-wrap: break-word; animation: bubble-in .15s ease; }
@keyframes bubble-in { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.msg-incoming { background: #fff; margin-right: auto; border-top-left-radius: 0; }
.msg-outgoing { background: #d9fdd3; margin-left: auto; border-top-right-radius: 0; }
[data-bs-theme="dark"] .msg-incoming { background: #1c2333; color: #e5e7eb; }
[data-bs-theme="dark"] .msg-outgoing { background: #113b2c; color: #e5e7eb; }

.msg-meta { display: flex; gap: .35rem; justify-content: flex-end; margin-top: .25rem; font-size: .68rem; color: #6b7280; align-items: center; }
.chat-input-bar { display: flex; gap: .6rem; padding: .75rem 1rem; border-top: 1px solid var(--panel-border); background: var(--panel-bg); }

.peak-hour-bar-track { background: var(--bg-body); border-radius: .3rem; height: 8px; overflow: hidden; flex-grow: 1; }
.peak-hour-bar-fill { background: var(--brand-primary); height: 100%; border-radius: .3rem; }

.search-result-item { padding: .85rem 1rem; border-radius: var(--radius-md); transition: background .1s ease; display: block; color: inherit; }
.search-result-item:hover { background: rgba(79,70,229,.06); color: inherit; }

.bulk-steps {
    background: var(--panel-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: 0 1.25rem;
    display: flex;
    overflow-x: auto;
}
.bulk-step {
    display: flex; align-items: center; gap: .5rem;
    padding: .9rem 1.25rem .9rem 0;
    font-size: .82rem; font-weight: 600; color: var(--text-muted);
    white-space: nowrap;
}
.bulk-step + .bulk-step::before { content: '\203A'; margin-right: 1.25rem; color: var(--panel-border); font-size: 1rem; }
.bulk-step.active { color: var(--brand-primary); }
.bulk-step.done { color: var(--wa-green-dark); }
.bulk-step-num {
    width: 20px; height: 20px; border-radius: 50%;
    background: var(--bg-body);
    display: flex; align-items: center; justify-content: center;
    font-size: .68rem; font-weight: 700;
}
.bulk-step.active .bulk-step-num { background: var(--brand-primary); color: #fff; }
.bulk-step.done .bulk-step-num { background: var(--wa-green); color: #fff; }

.upload-zone {
    border: 2px dashed var(--panel-border);
    border-radius: var(--radius-lg);
    padding: 3rem 1.25rem;
    text-align: center;
    cursor: pointer;
    transition: border-color .2s ease, background .2s ease;
}
.upload-zone:hover, .upload-zone.over { border-color: var(--wa-green); background: rgba(37,211,102,.05); }
.upload-zone i { font-size: 2.75rem; color: var(--wa-green); margin-bottom: .5rem; display: block; }
.upload-zone h2 { font-size: 1rem; font-weight: 600; margin-bottom: .25rem; color: var(--text-heading); }

@media (max-width: 991.98px) {
    .sidebar { position: fixed; left: -260px; z-index: 1050; transition: left .2s ease; }
    .sidebar.show { left: 0; }
    .chat-list-panel { width: 260px; }
    .topbar-search { display: none !important; }
}