:root {
    --color-bg: #f4f6f8;
    --color-surface: #ffffff;
    --color-border: #dde2e7;
    --color-text: #1f2933;
    --color-muted: #5f6b76;
    --color-primary: #1d6f8c;
    --color-primary-dark: #155267;
    --color-success-bg: #e6f6ec;
    --color-success-text: #1e7a3d;
    --color-error-bg: #fdecec;
    --color-error-text: #b42318;
    --color-warning-bg: #fff4e0;
    --color-warning-text: #92590a;
    --radius: 8px;
}

* {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    color: var(--color-primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Topbar — mobile first: wraps onto multiple lines on narrow screens */
.topbar {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

.topbar-inner {
    max-width: 1080px;
    margin: 0 auto;
    padding: 10px 16px;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 10px 16px;
}

.brand {
    font-weight: 700;
    font-size: 1.1rem;
    color: var(--color-primary-dark);
}

.topbar-inner nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
    flex: 1 1 100%;
    order: 3;
    font-size: 0.9rem;
}

.topbar-user {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--color-muted);
    font-size: 0.85rem;
    margin-left: auto;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    padding: 16px;
}

.auth-container {
    max-width: 360px;
    margin: 40px auto;
    padding: 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

h1 {
    font-size: 1.35rem;
    margin-bottom: 8px;
}

h2 {
    font-size: 1.1rem;
    margin-top: 28px;
    margin-bottom: 12px;
}

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 16px;
}

/* Tables scroll horizontally on narrow screens instead of squeezing columns */
.table-scroll {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    border-radius: var(--radius);
}

table {
    width: 100%;
    min-width: 560px;
    border-collapse: collapse;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
}

th, td {
    padding: 10px 12px;
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.92rem;
    white-space: nowrap;
}

thead th {
    background: #eef2f5;
    color: var(--color-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.72rem;
    letter-spacing: 0.03em;
}

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

form {
    display: flex;
    flex-direction: column;
    gap: 14px;
    width: 100%;
    max-width: 480px;
}

form.inline {
    flex-direction: row;
    flex-wrap: wrap;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    width: auto;
    max-width: none;
}

label {
    display: flex;
    flex-direction: column;
    gap: 4px;
    font-size: 0.9rem;
    color: var(--color-muted);
}

input, select, button {
    font-family: inherit;
    font-size: 1rem;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
    min-height: 42px;
}

input, select {
    width: 100%;
}

input:focus, select:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 1px;
}

button {
    background: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-weight: 600;
    align-self: flex-start;
    width: 100%;
}

button:hover {
    background: var(--color-primary-dark);
}

button.btn-danger {
    background: var(--color-error-text);
}

form.inline button,
form.inline input {
    width: auto;
}

table form.inline button {
    padding: 8px 12px;
    font-size: 0.85rem;
    min-height: 36px;
}

.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 16px;
    font-size: 0.92rem;
}

.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success-text);
}

.alert-error {
    background: var(--color-error-bg);
    color: var(--color-error-text);
}

.alert-warning {
    background: var(--color-warning-bg);
    color: var(--color-warning-text);
}

.muted {
    color: var(--color-muted);
}

.actions-cell {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    align-items: center;
    white-space: normal;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    background: #eef2f5;
    color: var(--color-muted);
    white-space: nowrap;
}

/* From here up, everything above is the mobile-first base. Progressive
   enhancement for larger screens only adds breathing room — no layout
   changes are required to stay usable at any width down to ~320px. */
@media (min-width: 640px) {
    .topbar-inner {
        padding: 14px 24px;
        gap: 24px;
    }

    .topbar-inner nav {
        flex: 1 1 auto;
        order: 0;
        font-size: 1rem;
    }

    .topbar-user {
        font-size: 0.9rem;
    }

    .container {
        padding: 32px 24px;
    }

    .auth-container {
        margin: 80px auto;
        padding: 32px;
    }

    h1 {
        font-size: 1.6rem;
    }

    h2 {
        font-size: 1.2rem;
    }

    .card {
        padding: 20px 24px;
    }

    button {
        width: auto;
    }
}