body {
    font-family: Arial, sans-serif;
    margin: 0;
    background: #f3f4f6;
    color: #1f2937;
    line-height: 1.5;
}

a {
    color: #2563eb;
    transition: color 0.15s ease;
}

a:hover {
    color: #1d4ed8;
}

:root {
    --color-bg-soft: #f9fafb;
    --color-bg-subtle: #f8fafc;
    --color-border: #e5e7eb;
    --color-border-strong: #d1d5db;
    --color-text-muted: #6b7280;
    --color-text-strong: #111827;
    --color-primary: #2563eb;
    --color-primary-strong: #1d4ed8;
    --color-primary-soft: #dbeafe;
    --color-success-soft: #dcfce7;
    --color-success-strong: #166534;
    --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.06);
    --shadow-focus: 0 0 0 4px rgba(37, 99, 235, 0.15);
}

.app-shell {
    min-height: 100vh;
}

.site-header {
    background: linear-gradient(180deg, #111827 0%, #1f2937 100%);
    color: #fff;
    padding: 40px 0 20px;
    box-shadow: inset 0 -1px 0 rgba(255,255,255,0.08);
}

.top-nav {
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid rgba(255,255,255,0.12);
}

.top-nav__list {
    list-style: none;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 0;
    padding: 0;
}

.top-nav__link {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
    padding: 0 14px;
    border-radius: 999px;
    color: #e5e7eb;
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.top-nav__link:hover {
    color: #fff;
    background: rgba(255,255,255,0.08);
}

.top-nav__link.is-active {
    background: #fff;
    color: #111827;
}

.top-nav__link.is-active:hover {
    color: #111827;
}

.top-nav__link:focus-visible {
    outline: 2px solid #93c5fd;
    outline-offset: 2px;
}

.wrap {
    width: min(1040px, calc(100% - 32px));
    margin: 0 auto;
}

.shell-header {
    display: flex;
    align-items: flex-start;
    gap: 24px;
}

.shell-brand {
    display: grid;
    gap: 8px;
}

.shell-eyebrow {
    margin: 0;
    color: #cbd5e1;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.shell-brand h1 {
    margin: 0;
    font-size: clamp(1.75rem, 3vw, 2.4rem);
}

.shell-subtitle {
    margin: 0;
    color: #cbd5e1;
    max-width: 60ch;
}

.app-main {
    padding: 24px 0 48px;
}

.flash {
    margin: 0 0 16px;
    padding: 14px 16px;
    border-radius: 12px;
    border: 1px solid transparent;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.06);
}

.flash-error {
    background: #fef2f2;
    border-color: #fecaca;
    color: #991b1b;
}

.flash-success {
    background: #ecfdf5;
    border-color: #a7f3d0;
    color: #065f46;
}

.content-shell {
    display: grid;
    gap: 20px;
}

.panel {
    background: #fff;
    border-radius: 14px;
    padding: 24px;
    margin: 0;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-soft);
}

.panel > :last-child {
    margin-bottom: 0;
}

.surface-muted {
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    border-radius: 12px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 20px;
}

.page-header__content {
    display: grid;
    gap: 6px;
}

.page-header__eyebrow {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.page-header__title {
    margin: 0;
    color: var(--color-text-strong);
}

.page-header__meta {
    margin: 0;
    color: var(--color-text-muted);
}

.button,
button,
input[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 14px;
    border-radius: 10px;
    border: 1px solid transparent;
    background: var(--color-text-strong);
    color: #fff;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.button:hover,
button:hover,
input[type="submit"]:hover {
    background: #0f172a;
    color: #fff;
}

.button-secondary {
    background: #fff;
    color: var(--color-text-strong);
    border-color: var(--color-border-strong);
}

.button-secondary:hover {
    background: var(--color-bg-soft);
    color: var(--color-text-strong);
}

.button-link {
    background: transparent;
    color: var(--color-primary);
    padding: 0;
    min-height: auto;
    border: 0;
    border-radius: 0;
}

.button-link:hover {
    background: transparent;
    color: var(--color-primary-strong);
}

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

.form-inline {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.form-control {
    width: 100%;
    min-height: 42px;
    padding: 10px 12px;
    border: 1px solid var(--color-border-strong);
    border-radius: 10px;
    background: #fff;
    color: var(--color-text-strong);
    box-sizing: border-box;
}

textarea.form-control {
    min-height: 110px;
    resize: vertical;
}

select.form-control {
    padding-right: 36px;
}

.form-label {
    display: grid;
    gap: 6px;
    font-weight: 600;
    color: var(--color-text-strong);
}

.form-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
}

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

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

.form-actions {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    padding-top: 8px;
}

.form-help {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 42px;
}

.checkbox-row input {
    width: 18px;
    height: 18px;
}

.action-row {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
}

.stack-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
}

.stack-list__item {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 16px;
    padding: 14px 16px;
}

.stack-list__content {
    display: grid;
    gap: 4px;
    min-width: 0;
}

.stack-list__title {
    margin: 0;
    font-weight: 700;
    color: var(--color-text-strong);
}

.stack-list__meta {
    margin: 0;
    color: var(--color-text-muted);
}

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 24px;
    padding: 0 10px;
    border-radius: 999px;
    background: var(--color-primary-soft);
    color: var(--color-primary-strong);
    font-size: 12px;
    font-weight: 700;
}

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

h1, h2, h3, h4 {
    margin-top: 0;
}

input,
select,
textarea {
    font: inherit;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible,
.button:focus-visible {
    outline: 2px solid #93c5fd;
    outline-offset: 2px;
    box-shadow: var(--shadow-focus);
}

p,
ul,
ol,
form {
    margin-top: 0;
}

.schedule-toolbar__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; margin-bottom: 0; }
.schedule-toolbar__form { display: flex; gap: 12px; align-items: end; flex-wrap: wrap; margin-top: 16px; }
.schedule-nav { display: flex; gap: 12px; flex-wrap: wrap; }
.schedule-nav__link { display: inline-flex; align-items: center; min-height: 40px; padding: 0 14px; border: 1px solid var(--color-border-strong); border-radius: 10px; background: #fff; text-decoration: none; color: var(--color-text-strong); font-weight: 600; transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease; }
.schedule-nav__link:hover { background: var(--color-bg-soft); color: var(--color-text-strong); }
.schedule-day-header { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: 20px; }
.schedule-day-header p { margin: 0; color: #6b7280; }
.schedule-empty { color: #6b7280; }
.schedule-groups { display: grid; gap: 18px; }
.schedule-group { border-top: 1px solid #e5e7eb; padding-top: 18px; }
.schedule-group:first-child { border-top: 0; padding-top: 0; }
.schedule-group__time { margin: 0 0 12px; color: #111827; }
.schedule-cards { display: grid; gap: 12px; }
.schedule-card { border: 1px solid #e5e7eb; border-radius: 10px; padding: 14px; background: var(--color-bg-subtle); transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease; }
.schedule-card:hover { border-color: var(--color-border-strong); box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08); transform: translateY(-1px); }
.schedule-card__title-row { display: flex; justify-content: space-between; gap: 12px; align-items: center; flex-wrap: wrap; margin-bottom: 10px; }
.schedule-card__title { font-weight: 700; color: #111827; text-decoration: none; }
.schedule-card__status { display: inline-block; padding: 4px 10px; border-radius: 999px; background: #dbeafe; color: #1d4ed8; font-size: 12px; font-weight: 700; text-transform: uppercase; }
.schedule-card__status--ok { background: var(--color-success-soft); color: var(--color-success-strong); }
.schedule-card__meta { margin: 0; display: grid; gap: 8px; }
.schedule-card__meta div { display: grid; grid-template-columns: 80px 1fr; gap: 8px; }
.schedule-card__meta dt { font-weight: 700; color: #6b7280; }
.schedule-card__meta dd { margin: 0; }

.dashboard-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 20px;
}

.dashboard-stack {
    display: grid;
    gap: 20px;
}

.dashboard-kpis {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.dashboard-kpi {
    padding: 18px;
}

.dashboard-kpi__label {
    margin: 0 0 8px;
    color: var(--color-text-muted);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.dashboard-kpi__value {
    margin: 0;
    font-size: 1.9rem;
    font-weight: 700;
    color: var(--color-text-strong);
}

.dashboard-kpi__meta {
    margin: 8px 0 0;
    color: var(--color-text-muted);
}

.quick-links {
    display: grid;
    gap: 12px;
}

.quick-link {
    display: flex;
    justify-content: space-between;
    gap: 16px;
    align-items: center;
    padding: 16px 18px;
    text-decoration: none;
    color: inherit;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease, background-color 0.15s ease;
}

.quick-link:hover {
    border-color: var(--color-border-strong);
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.08);
    transform: translateY(-1px);
    background: #fff;
}

.quick-link__content {
    display: grid;
    gap: 4px;
}

.quick-link__title {
    margin: 0;
    font-weight: 700;
    color: var(--color-text-strong);
}

.quick-link__meta {
    margin: 0;
    color: var(--color-text-muted);
}

.quick-link__arrow {
    color: var(--color-primary);
    font-weight: 700;
}

.dashboard-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 12px;
}

.dashboard-list__item {
    display: grid;
    gap: 4px;
    padding: 14px 16px;
}

.section-gap-top {
    margin-top: 16px;
}

.appointment-customer-field {
    grid-column: 1 / -1;
}

.appointment-search-results {
    display: grid;
    gap: 8px;
    padding: 10px;
    min-height: 42px;
}

.appointment-search-results__item {
    display: grid;
    gap: 2px;
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--color-border);
    border-radius: 10px;
    background: #fff;
    color: var(--color-text-strong);
    text-align: left;
}

.appointment-search-results__item:hover,
.appointment-search-results__item.is-selected {
    border-color: var(--color-border-strong);
    background: var(--color-bg-subtle);
}

.appointment-search-results__title {
    font-weight: 700;
    color: var(--color-text-strong);
}

.appointment-search-results__meta {
    color: var(--color-text-muted);
    font-size: 0.92rem;
}

.appointment-form-row-item {
    align-content: start;
}

.appointment-form-row-help {
    min-height: 1.35rem;
}

.appointment-form-row-help--placeholder {
    visibility: hidden;
}

.dashboard-list__title {
    margin: 0;
    font-weight: 700;
    color: var(--color-text-strong);
}

.dashboard-list__meta {
    margin: 0;
    color: var(--color-text-muted);
}

.empty-state {
    display: grid;
    gap: 10px;
    padding: 24px;
    text-align: left;
}

.empty-state__title {
    margin: 0;
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--color-text-strong);
}

.empty-state__meta {
    margin: 0;
    color: var(--color-text-muted);
}

.empty-state__actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

@media (max-width: 900px) {
    .dashboard-grid,
    .dashboard-kpis {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .site-header {
        padding-top: 32px;
    }

    .wrap {
        width: min(100%, calc(100% - 24px));
    }

    .top-nav__list {
        gap: 8px;
    }

    .top-nav__link {
        min-height: 36px;
        padding: 0 12px;
    }

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

    .panel,
    .dashboard-kpi,
    .quick-link,
    .dashboard-list__item,
    .empty-state {
        padding: 18px;
    }
}

/* --- Responsive App Shell (Module D1) --- */
.table-responsive {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    margin-bottom: 1rem;
    /* Optional: ensures shadow or border doesn't clip badly */
    width: 100%;
}

.mobile-menu-toggle {
    display: none; /* hidden on desktop */
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    align-items: center;
    transition: background 0.15s ease;
}

.mobile-menu-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

@media (max-width: 767px) {
    .shell-header {
        align-items: center !important;
    }
    
    .mobile-menu-toggle {
        display: inline-flex;
    }
    
    .top-nav {
        display: none;
    }
    
    .top-nav.is-open {
        display: block;
    }
    
    .top-nav__list {
        flex-direction: column;
        gap: 4px;
    }
    
    .top-nav__link {
        width: 100%;
        box-sizing: border-box;
        justify-content: flex-start;
        padding: 10px 14px;
    }
}