/* ==========================================================================
   1B Task Tracker
   Mobile-first UI
   ========================================================================== */

:root {
    --bg: #f4f7fb;
    --surface: #ffffff;
    --surface-soft: #eef3f8;
    --text: #172033;
    --muted: #6d7787;
    --border: #dfe5ec;

    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-soft: #eaf1ff;

    --success: #15803d;
    --success-soft: #eaf8ef;

    --warning: #b45309;
    --warning-soft: #fff4df;

    --danger: #b91c1c;
    --danger-soft: #feecec;

    --neutral: #667085;
    --neutral-soft: #f1f3f5;

    --radius-sm: 10px;
    --radius: 16px;
    --shadow: 0 8px 24px rgba(23, 32, 51, 0.08);

    --container: 860px;
}

* {
    box-sizing: border-box;
}

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

body {
    margin: 0;
    min-height: 100vh;
    font-family:
        Inter,
        ui-sans-serif,
        system-ui,
        -apple-system,
        BlinkMacSystemFont,
        "Segoe UI",
        sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.5;
}

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

a:hover {
    text-decoration: underline;
}

button,
input,
textarea,
select {
    font: inherit;
}

button,
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-height: 44px;
    padding: 0.7rem 1rem;
    border: 0;
    border-radius: var(--radius-sm);
    background: var(--primary);
    color: #fff;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
}

button:hover,
.button:hover {
    background: var(--primary-hover);
    text-decoration: none;
}

.button-secondary {
    background: var(--surface-soft);
    color: var(--text);
}

.button-secondary:hover {
    background: #e4eaf1;
}

.button-danger {
    background: var(--danger);
}

.button-danger:hover {
    background: #991b1b;
}

.button-success {
    background: var(--success);
}

.button-success:hover {
    background: #166534;
}

.page-shell {
    width: min(100%, var(--container));
    margin: 0 auto;
    padding: 0 14px 36px;
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    margin: 0 -14px 20px;
    padding: 12px 14px;
    background: rgba(244, 247, 251, 0.94);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(223, 229, 236, 0.85);
}

.topbar-inner {
    width: min(100%, var(--container));
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    text-decoration: none;
    font-weight: 800;
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 42px;
    height: 42px;
    border-radius: 13px;
    background: var(--primary);
    color: #fff;
    font-weight: 900;
    letter-spacing: -0.03em;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-title {
    font-size: 1rem;
}

.brand-subtitle {
    margin-top: 3px;
    color: var(--muted);
    font-size: 0.75rem;
    font-weight: 600;
}

.user-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--muted);
    font-size: 0.9rem;
}

.user-chip strong {
    color: var(--text);
}

.page-heading {
    margin: 8px 0 18px;
}

.page-heading h1,
.page-heading h2 {
    margin: 0;
    letter-spacing: -0.03em;
}

.page-heading p {
    margin: 6px 0 0;
    color: var(--muted);
}

.toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0 0 18px;
}

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.task-card {
    padding: 16px;
    margin-bottom: 14px;
}

.task-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.task-title {
    margin: 0;
    font-size: 1.08rem;
    line-height: 1.3;
}

.task-description {
    margin: 10px 0 14px;
    color: #354052;
}

.task-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 8px 0 14px;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 0.35rem 0.6rem;
    border-radius: 999px;
    font-size: 0.82rem;
    font-weight: 800;
}

.badge-date {
    background: var(--primary-soft);
    color: var(--primary);
}

.badge-pending {
    background: var(--warning-soft);
    color: var(--warning);
}

.badge-done {
    background: var(--success-soft);
    color: var(--success);
}

.badge-na {
    background: var(--neutral-soft);
    color: var(--neutral);
}

.badge-overdue {
    background: var(--danger-soft);
    color: var(--danger);
}

.task-form {
    margin-top: 12px;
    padding-top: 14px;
    border-top: 1px solid var(--border);
}

.status-grid {
    display: grid;
    gap: 8px;
    margin-bottom: 14px;
}

.status-option {
    position: relative;
}

.status-option input {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.status-option label {
    display: block;
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    cursor: pointer;
    font-weight: 700;
}

.status-option input:checked + label {
    border-color: var(--primary);
    background: var(--primary-soft);
    color: var(--primary);
}

.form-card {
    padding: 18px;
}

.form-grid {
    display: grid;
    gap: 16px;
}

.form-row {
    display: grid;
    gap: 6px;
}

.form-row label {
    font-weight: 800;
}

.form-help {
    margin: 0;
    color: var(--muted);
    font-size: 0.85rem;
}

input[type="text"],
input[type="password"],
input[type="date"],
input[type="time"],
textarea,
select {
    width: 100%;
    min-height: 46px;
    padding: 0.72rem 0.8rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: #fff;
    color: var(--text);
    outline: none;
}

textarea {
    min-height: 100px;
    resize: vertical;
}

input:focus,
textarea:focus,
select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.notice {
    margin: 0 0 16px;
    padding: 12px 14px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    background: var(--surface);
}

.notice-success {
    border-color: #b7e2c5;
    background: var(--success-soft);
    color: var(--success);
}

.notice-error {
    border-color: #f4bcbc;
    background: var(--danger-soft);
    color: var(--danger);
}

.notice ul {
    margin: 8px 0 0 18px;
    padding: 0;
}

.section {
    margin: 26px 0;
}

.section-title {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 12px;
}

.section-title h2 {
    margin: 0;
    font-size: 1.12rem;
}

.admin-list {
    display: grid;
    gap: 12px;
}

.admin-item {
    padding: 15px;
}

.admin-item h3 {
    margin: 0 0 8px;
}

.admin-item p {
    margin: 5px 0;
    color: var(--muted);
}

.admin-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.empty-state {
    padding: 28px 20px;
    text-align: center;
    color: var(--muted);
}

.login-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 20px;
}

.login-card {
    width: min(100%, 420px);
    padding: 24px;
}

.login-card .brand {
    justify-content: center;
    margin-bottom: 24px;
}

.login-card h1 {
    margin: 0 0 6px;
    text-align: center;
    font-size: 1.4rem;
}

.login-card > p {
    margin: 0 0 20px;
    text-align: center;
    color: var(--muted);
}

.logout-form {
    margin: 0;
}

.logout-form button {
    min-height: 40px;
    padding: 0.55rem 0.8rem;
    background: transparent;
    color: var(--muted);
    border: 1px solid var(--border);
}

.logout-form button:hover {
    background: var(--surface);
    color: var(--text);
}

@media (min-width: 640px) {
    .page-shell {
        padding-left: 20px;
        padding-right: 20px;
    }

    .topbar {
        margin-left: -20px;
        margin-right: -20px;
        padding-left: 20px;
        padding-right: 20px;
    }

    .status-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .form-grid.two-cols {
        grid-template-columns: 1fr 1fr;
    }

    .task-card,
    .form-card {
        padding: 20px;
    }
}