:root {
    /* Brand chrome (topbar/sidebar) stays this navy in both themes --
     * only the page/content surface tokens below switch. */
    --navy: #1B2A4A;
    --navy-dark: #16233F;
    --navy-soft: #2A3B63;
    --violet: #4B3AA8;
    --violet-light: #6A54D6;
    --green: #3EA05A;
    --green-bg: #E7F6EB;
    --amber: #E0B65C;
    --danger: #D64545;

    /* Light theme (default) */
    --page-bg: #F2F3F6;
    --card-bg: #FFFFFF;
    --text: #1B2130;
    --text-muted: #6B7280;
    --border: #E4E6EC;
    --input-bg: #FAFBFC;
    --surface-muted: #EEF0F4;
    --shadow: rgba(16,24,48,0.08);
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --page-bg: #12151C;
        --card-bg: #1B2029;
        --text: #E7E9EE;
        --text-muted: #9098AA;
        --border: #2B313E;
        --input-bg: #232936;
        --surface-muted: #262C38;
        --shadow: rgba(0,0,0,0.35);
        --green-bg: #16321F;
        color-scheme: dark;
    }
}

:root[data-theme="dark"] {
    --page-bg: #12151C;
    --card-bg: #1B2029;
    --text: #E7E9EE;
    --text-muted: #9098AA;
    --border: #2B313E;
    --input-bg: #232936;
    --surface-muted: #262C38;
    --shadow: rgba(0,0,0,0.35);
    --green-bg: #16321F;
    color-scheme: dark;
}

* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--page-bg);
    color: var(--text);
    font-family: "Poppins", "Segoe UI", -apple-system, Roboto, sans-serif;
    /* Only individual containers (tables, charts) should ever scroll
     * sideways -- the page itself never should. */
    overflow-x: hidden;
    max-width: 100vw;
}

a { color: inherit; text-decoration: none; }

#topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
    padding: 0 20px;
    background: var(--navy);
    color: #fff;
}

#topbar-brand {
    font-weight: 700;
    font-size: 16px;
    letter-spacing: 0.01em;
    display: flex;
    align-items: center;
    gap: 14px;
}
#sidebarToggle {
    background: none;
    border: none;
    color: #C7CEE6;
    font-size: 18px;
    cursor: pointer;
    padding: 4px 6px;
    border-radius: 6px;
    line-height: 1;
}
#sidebarToggle:hover { background: rgba(255,255,255,0.1); }

.theme-toggle {
    background: none;
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: 6px;
    color: #C7CEE6;
    cursor: pointer;
    padding: 5px 9px;
    font-size: 13px;
    line-height: 1;
}
.theme-toggle:hover { background: rgba(255,255,255,0.1); }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: inline; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: none; }
    :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: inline; }
}
.brand-dashboard { color: #C7CEE6; }
.brand-krh { color: #6FE0A0; }
.brand-version {
    font-size: 11px;
    vertical-align: super;
    color: #9AA6C6;
    margin-left: 2px;
}

#topbar-actions {
    display: flex;
    align-items: center;
    gap: 18px;
}

.lang-toggle {
    font-size: 13px;
    color: #B9C2DE;
}
.lang-toggle a { padding: 4px 6px; border-radius: 4px; }
.lang-toggle a.active { color: #fff; background: rgba(255,255,255,0.12); }
.lang-toggle .sep { color: #56659A; margin: 0 2px; }

.user-chip {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
}
.user-name { color: #E4E8F5; }
.logout-link {
    color: #C7CEE6;
    border: 1px solid rgba(255,255,255,0.25);
    border-radius: 6px;
    padding: 5px 12px;
}
.logout-link:hover { background: rgba(255,255,255,0.1); }

#app-shell {
    display: flex;
    min-height: calc(100vh - 56px);
}

#sidebar {
    width: 250px;
    flex-shrink: 0;
    background: var(--navy-dark);
    padding: 16px 0;
    transition: width 0.15s ease;
    overflow: hidden;
}
#sidebar a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 11px 20px;
    color: #AEB8D6;
    font-size: 13.5px;
    border-left: 3px solid transparent;
}
#sidebar a:hover { background: rgba(255,255,255,0.04); color: #fff; }
#sidebar a.active {
    background: rgba(111,224,160,0.08);
    color: #fff;
    border-left-color: #6FE0A0;
    font-weight: 600;
}
.nav-label {
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    min-width: 0;
}
.nav-badge {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 6px;
    background: rgba(255,255,255,0.06);
    font-size: 10px;
    font-weight: 700;
    letter-spacing: 0.02em;
}
#sidebar a.active .nav-badge { background: rgba(111,224,160,0.18); }
.sidebar-divider {
    height: 1px;
    background: rgba(255,255,255,0.08);
    margin: 10px 20px;
}

/* Collapsed sidebar: icon-rail only, badge stays, label hides */
#app-shell.sidebar-collapsed #sidebar { width: 68px; }
#app-shell.sidebar-collapsed #sidebar a { padding: 11px 0; justify-content: center; }
#app-shell.sidebar-collapsed .nav-label { display: none; }
#app-shell.sidebar-collapsed .sidebar-divider { margin: 10px 14px; }

#content {
    flex: 1;
    padding: 28px 32px;
}

h1.page-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text);
    margin: 0 0 6px;
}
.page-title-rule {
    height: 1px;
    background: var(--border);
    margin: 0 0 24px;
}

.card {
    background: var(--card-bg);
    border-radius: 10px;
    box-shadow: 0 1px 3px var(--shadow);
    padding: 20px;
}

.kpi-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.kpi-card {
    background: var(--navy);
    color: #fff;
    border-radius: 10px;
    padding: 18px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.kpi-card .kpi-number {
    font-size: 30px;
    font-weight: 800;
    margin-right: 10px;
}
.kpi-card .kpi-label {
    font-size: 13px;
    color: #C7CEE6;
    line-height: 1.3;
}
.kpi-card.violet { background: linear-gradient(135deg, var(--violet), var(--violet-light)); }

.status-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}
.status-table th, .status-table td {
    padding: 10px 12px;
    text-align: center;
    border-bottom: 1px solid var(--border);
}
.status-table th { color: var(--text-muted); font-weight: 600; }
.status-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border-radius: 50%;
    background: var(--green-bg);
    color: var(--green);
    font-weight: 700;
}

.chart-wrap { position: relative; height: 380px; }

/* Login page */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, var(--navy) 0%, var(--navy-dark) 100%);
}
.login-card {
    background: #fff;
    border-radius: 14px;
    padding: 36px 34px;
    width: 100%;
    max-width: 360px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.35);
}
.login-brand {
    text-align: center;
    font-size: 20px;
    font-weight: 800;
    margin-bottom: 4px;
}
.login-brand .brand-dashboard { color: var(--navy); }
.login-brand .brand-krh { color: var(--green); }
.login-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 13px;
    margin-bottom: 24px;
}
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    font-size: 12.5px;
    color: var(--text-muted);
    margin-bottom: 6px;
}
.form-group input[type=text],
.form-group input[type=email],
.form-group input[type=password],
.form-group input[type=number],
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    font-size: 14px;
    background: var(--input-bg);
    color: var(--text);
}
.btn {
    display: inline-block;
    background: var(--navy);
    color: #fff;
    border: none;
    border-radius: 8px;
    padding: 11px 18px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
.btn:hover { background: var(--navy-soft); }
.btn-block { width: 100%; text-align: center; }
.alert {
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-bottom: 16px;
}
.alert-error { background: #FCEAEA; color: var(--danger); border: 1px solid #F3C6C6; }
.alert-success { background: var(--green-bg); color: var(--green); border: 1px solid #BEE7C9; }

/* Responsive: below this width the sidebar becomes an off-canvas
 * drawer (hidden by default, toggled by the same hamburger button)
 * instead of desktop's push/collapse layout -- and content, KPI/chart
 * grids, and the topbar itself all reflow to a single column so
 * nothing forces the page wider than the viewport. */
.nav-backdrop {
    display: none;
}
@media (max-width: 960px) {
    #sidebar {
        position: fixed;
        top: 56px;
        left: 0;
        bottom: 0;
        width: 250px;
        transform: translateX(-100%);
        transition: transform 0.2s ease;
        z-index: 60;
        box-shadow: 2px 0 20px rgba(0,0,0,0.35);
    }
    /* The desktop icon-rail "collapsed" state means nothing here --
     * mobile always starts fully hidden regardless of that cookie. */
    #app-shell.sidebar-collapsed #sidebar { width: 250px; }
    #app-shell.sidebar-collapsed .nav-label { display: inline; }
    #app-shell.mobile-nav-open #sidebar { transform: translateX(0); }

    .nav-backdrop {
        display: block;
        position: fixed;
        inset: 56px 0 0 0;
        background: rgba(0,0,0,0.4);
        z-index: 55;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.2s ease;
    }
    #app-shell.mobile-nav-open .nav-backdrop {
        opacity: 1;
        pointer-events: auto;
    }

    #content { padding: 18px 14px; }
    .dash-charts-grid, .bs-grid { grid-template-columns: 1fr !important; }
    h1.page-title { font-size: 21px; }

    #topbar { padding: 0 12px; }
    #topbar-actions { gap: 8px; }
    .brand-version { display: none; }
    .user-chip .user-name { display: none; }
    .lang-toggle { font-size: 12px; }
}

@media (max-width: 560px) {
    .kpi-card { flex-direction: column; align-items: flex-start; gap: 4px; }
    .kpi-card .kpi-number { font-size: 24px; }
}