:root {
    --ct-bg: #f4f6f8;
    --ct-card-bg: #fff;
    --ct-border: #d6dce1;
    --ct-primary: #0a5fa3;
    --ct-primary-text: #fff;
    --ct-warning-bg: #fff7e6;
    --ct-warning-border: #f3c969;
    --ct-error-bg: #fde8e7;
    --ct-error-border: #c5392a;
    --ct-success-bg: #e6f7ed;
    --ct-success-border: #2c8a4b;
}
*, *::before, *::after { box-sizing: border-box; }
body { font-family: system-ui, sans-serif; background: var(--ct-bg); margin: 0; }
.ct-admin-header {
    background: var(--ct-primary); color: var(--ct-primary-text);
    padding: 0.75rem 1rem; display: flex; align-items: center; gap: 1.5rem;
    flex-wrap: wrap;
}
.ct-admin-header .ct-brand { color: var(--ct-primary-text); font-weight: 600; text-decoration: none; }
.ct-admin-nav { display: flex; flex-wrap: wrap; gap: 0.25rem 1rem; }
.ct-admin-nav a { color: var(--ct-primary-text); text-decoration: none; padding: 0.15rem 0.5rem; border-radius: 4px; }
.ct-admin-nav a:hover { text-decoration: underline; }

/* CSS-only hamburger toggle (mobile only). Hidden on desktop. */
.ct-nav-toggle { display: none; }
.ct-nav-burger { display: none; }
.ct-admin-main { padding: 1.5rem; max-width: 1100px; margin: 0 auto; }
.ct-admin-footer { padding: 1rem; text-align: center; color: #666; }
.ct-card {
    background: var(--ct-card-bg); border: 1px solid var(--ct-border);
    padding: 1rem; border-radius: 6px; min-width: 200px;
}
.ct-stats { display: grid; gap: 1rem; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.ct-stat { font-size: 2rem; margin: 0; font-weight: 600; color: var(--ct-primary); }
table.ct-table { width: 100%; border-collapse: collapse; background: var(--ct-card-bg); }
table.ct-table th, table.ct-table td {
    padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--ct-border);
    text-align: left; vertical-align: top;
}
table.ct-table th { background: #eef2f5; }
.ct-btn {
    background: var(--ct-primary); color: var(--ct-primary-text);
    border: 0; padding: 0.4rem 0.9rem; border-radius: 4px; cursor: pointer;
    text-decoration: none; display: inline-block;
}
.ct-btn--danger { background: #c5392a; }
.ct-btn--secondary { background: #6b7785; }
.ct-btn--ghost { background: transparent; color: var(--ct-primary); border: 1px solid var(--ct-primary); }
.ct-flashes { list-style: none; padding: 0; }
.ct-flash { padding: 0.6rem 1rem; border-radius: 4px; margin-bottom: 0.5rem; border: 1px solid var(--ct-border); }
.ct-flash--success { background: var(--ct-success-bg); border-color: var(--ct-success-border); }
.ct-flash--error, .ct-flash--danger { background: var(--ct-error-bg); border-color: var(--ct-error-border); }
.ct-flash--warning { background: var(--ct-warning-bg); border-color: var(--ct-warning-border); }
.ct-banner { padding: 1rem; border-radius: 4px; }
.ct-warning { background: var(--ct-warning-bg); border: 1px solid var(--ct-warning-border); }
.ct-form { display: grid; gap: 0.75rem; max-width: 600px; background: var(--ct-card-bg); padding: 1rem; border-radius: 6px; border: 1px solid var(--ct-border); }
.ct-form label { display: flex; flex-direction: column; gap: 0.25rem; font-weight: 500; }
.ct-form input[type=text], .ct-form input[type=url], .ct-form input[type=date], .ct-form input[type=number], .ct-form select, .ct-form textarea {
    padding: 0.4rem 0.6rem; border: 1px solid var(--ct-border); border-radius: 4px; font: inherit;
}
.ct-form textarea { min-height: 4rem; }
.ct-inline-form { display: inline-block; margin: 0; }
.ct-actions { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.ct-tag-pill { display: inline-block; padding: 0.15rem 0.5rem; background: #eef2f5; border-radius: 999px; margin-right: 0.25rem; font-size: 0.85rem; }
.ct-status { font-size: 1.05rem; line-height: 1; vertical-align: middle; }
.ct-status--active { color: #2c8a4b; }
.ct-status--inactive { color: #999; }
.ct-stat--date { font-size: 1.1rem; font-weight: 500; word-break: break-all; }
.ct-stat--unit { font-size: 1.1rem; font-weight: 500; color: var(--ct-primary); }
.ct-danger-zone { background: var(--ct-error-bg); border: 1px solid var(--ct-error-border); padding: 1rem; border-radius: 6px; }
.ct-error main { padding: 2rem; max-width: 600px; margin: 0 auto; text-align: center; }

/* ---- Mobile (max-width: 720px) --------------------------------------- */
@media (max-width: 720px) {
    .ct-admin-header {
        gap: 0.75rem;
        padding: 0.6rem 0.75rem;
    }
    .ct-admin-header .ct-brand { font-size: 1.05rem; }

    /* Show the burger; brand on left, burger on right */
    .ct-nav-burger {
        display: inline-flex;
        flex-direction: column;
        justify-content: center;
        gap: 5px;
        width: 40px;
        height: 40px;
        padding: 8px;
        margin-left: auto;
        cursor: pointer;
        border-radius: 4px;
        background: transparent;
        border: 1px solid rgba(255, 255, 255, 0.5);
        -webkit-tap-highlight-color: transparent;
    }
    .ct-nav-burger:hover { background: rgba(255, 255, 255, 0.1); }
    .ct-nav-burger:focus-within { outline: 2px solid var(--ct-primary-text); outline-offset: 1px; }
    .ct-nav-burger span {
        display: block;
        width: 100%;
        height: 2px;
        background: var(--ct-primary-text);
        border-radius: 2px;
        transition: transform 0.15s ease, opacity 0.15s ease;
    }
    /* Animate into an X when the toggle is checked */
    .ct-nav-toggle:checked ~ .ct-nav-burger span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    .ct-nav-toggle:checked ~ .ct-nav-burger span:nth-child(2) { opacity: 0; }
    .ct-nav-toggle:checked ~ .ct-nav-burger span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    /* Nav becomes a collapsible drawer that spans the full width.
     * Hidden by default; revealed when the checkbox is checked. */
    .ct-admin-nav {
        display: none;
        order: 3;
        flex-basis: 100%;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding-top: 0.5rem;
        border-top: 1px solid rgba(255, 255, 255, 0.25);
    }
    .ct-nav-toggle:checked ~ .ct-admin-nav { display: flex; }
    .ct-admin-nav a {
        padding: 0.6rem 0.5rem;
        margin-right: 0;
        border-radius: 4px;
        min-height: 44px;
        display: flex;
        align-items: center;
    }
    .ct-admin-nav a:hover, .ct-admin-nav a:focus { background: rgba(255, 255, 255, 0.12); text-decoration: none; }

    /* Tighten the main gutter on phones */
    .ct-admin-main { padding: 1rem 0.75rem; }
    h1 { font-size: 1.4rem; }

    /* Tables scroll horizontally so columns stay aligned */
    .ct-table { display: block; overflow-x: auto; -webkit-overflow-scrolling: touch; }

    /* Forms stretch to the viewport */
    .ct-form { max-width: 100%; padding: 0.75rem; }
    .ct-form input[type=text], .ct-form input[type=url], .ct-form input[type=date],
    .ct-form input[type=number], .ct-form select, .ct-form textarea {
        font-size: 16px; /* prevent iOS zoom-on-focus */
    }

    /* Action buttons stack full-width for easier tapping */
    .ct-actions { flex-direction: column; align-items: stretch; }
    .ct-actions > * { width: 100%; text-align: center; }
    .ct-inline-form { display: block; }
    .ct-inline-form button { width: 100%; }

    /* Stat grid stays fluid but with smaller cards */
    .ct-card { min-width: 0; padding: 0.75rem; }
    .ct-stat { font-size: 1.5rem; }

    /* Pills wrap nicely */
    .ct-tag-pill { margin-bottom: 0.25rem; }
}

/* Tablets get a slightly wider gutter */
@media (min-width: 721px) and (max-width: 960px) {
    .ct-admin-main { padding: 1.25rem; }
    .ct-admin-header { gap: 1rem; }
}