:root {
    --bg-primary: #1a1d23;
    --bg-secondary: #21252b;
    --bg-card: #282c34;
    --bg-card-hover: #2f3440;
    --bg-sidebar: #181b20;
    --bg-input: #2a2e36;
    --text-primary: #e4e6eb;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    --accent: #6366f1;
    --accent-hover: #818cf8;
    --accent-subtle: rgba(99, 102, 241, 0.12);
    --success: #22c55e;
    --success-subtle: rgba(34, 197, 94, 0.12);
    --warning: #f59e0b;
    --warning-subtle: rgba(245, 158, 11, 0.12);
    --danger: #ef4444;
    --danger-subtle: rgba(239, 68, 68, 0.12);
    --info: #3b82f6;
    --info-subtle: rgba(59, 130, 246, 0.12);
    --border: #2d3139;
    --border-light: #383d47;
    --radius: 12px;
    --radius-sm: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.2);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.15);
    --transition: all 0.2s ease;
    --sidebar-width: 260px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    line-height: 1.6;
}

/* Scrollbar */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* ==================== SIDEBAR ==================== */
.sidebar {
    width: var(--sidebar-width);
    height: 100vh;
    position: fixed;
    left: 0;
    top: 0;
    background: var(--bg-sidebar);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: var(--transition);
}

.sidebar-brand {
    padding: 24px 20px;
    border-bottom: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
}

.brand-icon {
    width: 44px;
    height: 44px;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: #fff;
    margin-bottom: 6px;
}

.brand-text {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--text-primary);
}

.brand-sub {
    font-size: 10px;
    color: var(--text-muted);
    letter-spacing: 1px;
    text-transform: uppercase;
}

.sidebar-nav {
    flex: 1;
    padding: 16px 12px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: var(--transition);
    font-size: 14px;
    font-weight: 500;
}

.nav-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-item.active {
    background: var(--accent-subtle);
    color: var(--accent-hover);
}

.nav-item.active i {
    color: var(--accent);
}

.nav-item i {
    width: 20px;
    text-align: center;
    font-size: 16px;
}

.sidebar-footer {
    padding: 16px;
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 10px;
}

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    color: #fff;
}

.user-details strong {
    display: block;
    font-size: 13px;
    color: var(--text-primary);
}

.user-details small {
    font-size: 11px;
    color: var(--text-muted);
}

.logout-btn {
    width: 34px;
    height: 34px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.logout-btn:hover {
    background: var(--danger-subtle);
    color: var(--danger);
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    margin-left: var(--sidebar-width);
    flex: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.top-bar {
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid var(--border);
    background: var(--bg-secondary);
    position: sticky;
    top: 0;
    z-index: 50;
}

.top-bar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 18px;
    cursor: pointer;
    padding: 8px;
    border-radius: var(--radius-sm);
}

.sidebar-toggle:hover {
    background: var(--bg-card);
}

.page-title {
    font-size: 20px;
    font-weight: 600;
}

.date-display {
    font-size: 13px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.content-area {
    padding: 28px 32px;
    flex: 1;
}

/* ==================== CARDS ==================== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 20px;
    margin-bottom: 28px;
}

.stat-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.stat-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
}

.stat-card.accent::before { background: linear-gradient(90deg, var(--accent), var(--accent-hover)); }
.stat-card.success::before { background: linear-gradient(90deg, var(--success), #4ade80); }
.stat-card.warning::before { background: linear-gradient(90deg, var(--warning), #fbbf24); }
.stat-card.danger::before { background: linear-gradient(90deg, var(--danger), #f87171); }
.stat-card.info::before { background: linear-gradient(90deg, var(--info), #60a5fa); }

.stat-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.stat-card-header span {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-icon {
    width: 42px;
    height: 42px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.stat-icon.accent { background: var(--accent-subtle); color: var(--accent); }
.stat-icon.success { background: var(--success-subtle); color: var(--success); }
.stat-icon.warning { background: var(--warning-subtle); color: var(--warning); }
.stat-icon.danger { background: var(--danger-subtle); color: var(--danger); }
.stat-icon.info { background: var(--info-subtle); color: var(--info); }

.stat-value {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-change {
    font-size: 12px;
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* ==================== PANELS / SECTIONS ==================== */
.panel {
    background: var(--bg-card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    margin-bottom: 24px;
    overflow: hidden;
}

.panel-header {
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.panel-header h2 {
    font-size: 16px;
    font-weight: 600;
}

.panel-body {
    padding: 24px;
}

.panel-body.no-pad {
    padding: 0;
}

/* ==================== GRID LAYOUTS ==================== */
.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-bottom: 24px;
}

/* ==================== TABLE ==================== */
.table-wrapper {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
}

table thead th {
    padding: 14px 20px;
    text-align: left;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    white-space: nowrap;
}

table tbody td {
    padding: 14px 20px;
    font-size: 14px;
    border-bottom: 1px solid var(--border);
    color: var(--text-secondary);
}

table tbody tr:hover td {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

table tbody tr:last-child td {
    border-bottom: none;
}

/* ==================== BADGES ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
}

.badge.accent { background: var(--accent-subtle); color: var(--accent-hover); }
.badge.success { background: var(--success-subtle); color: var(--success); }
.badge.warning { background: var(--warning-subtle); color: var(--warning); }
.badge.danger { background: var(--danger-subtle); color: var(--danger); }
.badge.info { background: var(--info-subtle); color: var(--info); }
.badge.neutral { background: rgba(156,163,175,0.12); color: var(--text-secondary); }

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background: var(--accent-hover);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-secondary {
    background: var(--bg-input);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.btn-sm {
    padding: 6px 14px;
    font-size: 13px;
}

/* ==================== FORMS ==================== */
.form-group {
    margin-bottom: 18px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-control {
    width: 100%;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    padding-right: 36px;
}

.search-box {
    position: relative;
}

.search-box i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 14px;
}

.search-box input {
    padding-left: 40px;
}

.filters-row {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

/* ==================== LOGIN PAGE ==================== */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-primary);
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--bg-card);
    border-radius: 16px;
    border: 1px solid var(--border);
    padding: 48px 40px;
    box-shadow: var(--shadow);
}

.login-brand {
    text-align: center;
    margin-bottom: 36px;
}

.login-brand .brand-icon {
    margin: 0 auto 12px;
    width: 56px;
    height: 56px;
    font-size: 24px;
}

.login-brand h1 {
    font-size: 28px;
    letter-spacing: 4px;
    font-weight: 700;
    margin-bottom: 4px;
}

.login-brand p {
    font-size: 13px;
    color: var(--text-muted);
}

.login-card .form-group {
    margin-bottom: 20px;
}

.login-card .form-control {
    padding: 12px 16px;
    font-size: 15px;
}

.login-card .btn {
    width: 100%;
    padding: 13px;
    font-size: 15px;
    justify-content: center;
}

.login-error {
    background: var(--danger-subtle);
    color: var(--danger);
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* ==================== CHART CONTAINERS ==================== */
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

.chart-container-sm {
    position: relative;
    height: 220px;
    width: 100%;
}

/* ==================== PROGRESS BAR ==================== */
.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--bg-input);
    border-radius: 4px;
    overflow: hidden;
}

.progress-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 0.6s ease;
}

.progress-bar-fill.accent { background: var(--accent); }
.progress-bar-fill.success { background: var(--success); }
.progress-bar-fill.warning { background: var(--warning); }
.progress-bar-fill.danger { background: var(--danger); }

/* ==================== LIST ITEMS ==================== */
.list-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 14px 0;
    border-bottom: 1px solid var(--border);
}

.list-item:last-child {
    border-bottom: none;
}

.list-item-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.list-avatar {
    width: 40px;
    height: 40px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    color: #fff;
}

/* ==================== PAGINATION ==================== */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 20px;
}

.pagination a, .pagination span {
    padding: 8px 14px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    text-decoration: none;
    transition: var(--transition);
}

.pagination a {
    color: var(--text-secondary);
    background: var(--bg-input);
    border: 1px solid var(--border);
}

.pagination a:hover {
    background: var(--bg-card-hover);
    color: var(--text-primary);
}

.pagination .active {
    background: var(--accent);
    color: #fff;
    border: 1px solid var(--accent);
}

/* ==================== CUSTOMER DETAIL ==================== */
.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
}

.detail-item label {
    font-size: 12px;
    color: var(--text-muted);
    display: block;
    margin-bottom: 4px;
}

.detail-item span {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .grid-2, .grid-3 {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    body.sidebar-open .sidebar {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-toggle {
        display: block;
    }

    .content-area {
        padding: 20px 16px;
    }

    .top-bar {
        padding: 16px 20px;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
    }

    .filters-row {
        flex-direction: column;
        align-items: stretch;
    }
}

@media (max-width: 480px) {
    .stats-grid {
        grid-template-columns: 1fr;
    }

    .login-card {
        padding: 32px 24px;
    }
}

/* ==================== CHAT WIDGET ==================== */
#dasha-chat-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 56px;
    height: 56px;
    border-radius: 16px;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 6px 24px rgba(99, 102, 241, 0.4);
    transition: all 0.3s ease;
}

#dasha-chat-btn:hover {
    transform: scale(1.08);
    box-shadow: 0 8px 32px rgba(99, 102, 241, 0.55);
}

#dasha-chat-btn.hidden { display: none; }

#dasha-chat-panel {
    position: fixed;
    bottom: 28px;
    right: 28px;
    width: 400px;
    height: 540px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    z-index: 1001;
    display: none;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 12px 48px rgba(0, 0, 0, 0.4);
    animation: chatSlideUp 0.25s ease-out;
}

#dasha-chat-panel.open {
    display: flex;
}

@keyframes chatSlideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.chat-header {
    padding: 16px 20px;
    background: var(--bg-sidebar);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.chat-header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.chat-avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--accent), #a855f7);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 16px;
}

.chat-header strong {
    display: block;
    font-size: 14px;
    color: var(--text-primary);
}

.chat-header small {
    font-size: 11px;
    color: var(--text-muted);
}

#dasha-chat-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 16px;
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: var(--transition);
}

#dasha-chat-close:hover {
    background: var(--danger-subtle);
    color: var(--danger);
}

#dasha-chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.chat-msg {
    display: flex;
    max-width: 88%;
}

.chat-msg.bot { align-self: flex-start; }
.chat-msg.user { align-self: flex-end; }

.chat-msg-content {
    padding: 10px 14px;
    border-radius: 12px;
    font-size: 13.5px;
    line-height: 1.55;
    word-break: break-word;
    white-space: pre-wrap;
}

.chat-msg.bot .chat-msg-content {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.chat-msg.user .chat-msg-content {
    background: var(--accent);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.chat-msg.bot.typing .chat-msg-content {
    color: var(--text-muted);
    font-style: italic;
}

.chat-input-area {
    padding: 14px 16px;
    border-top: 1px solid var(--border);
    display: flex;
    gap: 10px;
    background: var(--bg-sidebar);
}

#dasha-chat-input {
    flex: 1;
    padding: 10px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
}

#dasha-chat-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}

#dasha-chat-send {
    width: 42px;
    height: 42px;
    border-radius: var(--radius-sm);
    background: var(--accent);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

#dasha-chat-send:hover {
    background: var(--accent-hover);
}

#dasha-chat-send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

@media (max-width: 480px) {
    #dasha-chat-panel {
        width: calc(100vw - 20px);
        height: calc(100vh - 80px);
        bottom: 10px;
        right: 10px;
        border-radius: 12px;
    }

    #dasha-chat-btn {
        bottom: 16px;
        right: 16px;
    }
}