/* Shared visual contracts. Page files retain geometry and gameplay states. */
:root {
    color-scheme: dark;
    --space-1: 4px;
    --space-2: 8px;
    --space-3: 12px;
    --space-4: 16px;
    --space-5: 24px;
    --space-6: 32px;
    --type-small: 0.8125rem;
    --type-body: 1rem;
    --type-section: 1.125rem;
    --type-title: clamp(1.25rem, 1.1rem + 0.5vw, 1.625rem);
    --radius-control: 3px;
    --radius-panel: 4px;
    --control-height: 44px;
    --content-reading: 980px;
    --content-standard: 1180px;
    --content-wide: 1600px;
    --shadow-panel: 0 8px 24px rgba(0, 0, 0, 0.28);
    --shadow-dialog: 0 20px 48px rgba(0, 0, 0, 0.52);
    --layer-content: 1;
    --layer-header: 2000;
    --layer-drawer: 2100;
    --layer-dialog: 10000;
    --layer-tutorial: 25000;
}

body {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
}

.ui-page-header.ui-page-header {
    display: flex;
    flex: 0 0 auto;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin: 0 0 var(--space-4);
    padding: 0 0 var(--space-3);
    border-bottom: 1px solid var(--border-muted);
    background: transparent;
    text-align: left;
}

.ui-page-title.ui-page-title {
    margin: 0;
    color: var(--text-heading);
    font: 700 var(--type-title)/1.2 var(--font-display);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    overflow-wrap: anywhere;
}

.ui-page-description.ui-page-description {
    margin: var(--space-1) 0 0;
    color: var(--text-muted);
    font: 400 var(--type-body)/1.45 var(--font-body);
    max-width: 75ch;
}

.ui-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.ui-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(100%, 260px), 1fr));
    gap: var(--space-4);
}

.ui-field {
    display: grid;
    gap: var(--space-2);
    min-width: 0;
}

.ui-table-scroll {
    min-width: 0;
    max-width: 100%;
    overflow-x: auto;
    scrollbar-color: var(--gold-soft) var(--bg-panel);
}

body :is(.tactical-panel, .tactical-frame, .tactical-popup) {
    border-color: var(--border-bright);
    border-radius: var(--radius-panel);
    background: var(--surface-panel);
    box-shadow: var(--shadow-panel);
}

body .tactical-popup {
    box-shadow: var(--shadow-dialog);
}

body .tactical-page:not(.is-placement-map-only) > .tactical-frame {
    background: var(--surface-workspace);
}

body :is(.tactical-frame, .tactical-popup)::before,
body :is(.tactical-frame, .tactical-popup)::after {
    opacity: 0.4;
}

/* Retain layout, disabled/invalid states and custom checkboxes from their owners. */
body :is(input:not([type='checkbox']):not([type='radio']):not([type='range']):not([type='color']):not([type='hidden']):not([type='button']):not([type='submit']), select, textarea) {
    box-sizing: border-box;
    max-width: 100%;
    min-width: 0;
    color: var(--text-main);
    background-color: var(--surface-input);
    border-color: var(--border-muted);
    border-radius: var(--radius-control);
    font-family: var(--font-body);
    accent-color: var(--gold);
}

body :is(input, textarea)::placeholder {
    color: var(--text-muted);
    opacity: 1;
}

body :is(button, a, input, select, textarea, summary, [tabindex]):focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: -3px;
}

.ui-skip-link {
    position: fixed;
    top: var(--space-2);
    left: var(--space-2);
    z-index: var(--layer-tutorial);
    padding: var(--space-3);
    background: var(--bg-panel);
    color: var(--text-heading);
    transform: translateY(-200%);
}

.ui-skip-link:focus {
    transform: none;
}

#buttons {
    gap: var(--space-1);
    scrollbar-width: thin;
    scrollbar-color: var(--gold-soft) var(--bg-panel);
}

#buttons::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

#buttons::-webkit-scrollbar-track {
    background: var(--bg-panel);
}

#buttons::-webkit-scrollbar-thumb {
    background: var(--gold-soft);
    border-radius: 3px;
}

#buttons .nav-group {
    flex: 0 0 auto;
    width: 100%;
    min-width: 0;
    border-top: 1px solid var(--border-dark);
}

#buttons .nav-group summary {
    padding: var(--space-2) var(--space-1);
    color: var(--text-muted);
    font: 700 var(--type-small)/1.4 var(--font-display);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    cursor: pointer;
}

#buttons .nav-group-items {
    display: grid;
    gap: 2px;
    padding-bottom: var(--space-2);
}

#buttons .main-button {
    flex-shrink: 0;
    justify-content: flex-start;
    min-height: 36px;
    height: auto;
    padding: 8px 10px;
    text-align: left;
    font-size: 14px;
    line-height: 1.2;
    white-space: normal;
    text-transform: none;
    letter-spacing: 0.02em;
    background: transparent;
    border-color: transparent;
    box-shadow: none;
    clip-path: none;
    color: var(--text-main);
}

#buttons .main-button::before {
    content: none;
}

#buttons .main-button:hover {
    background: var(--glass);
    transform: none;
}

#buttons .main-button.active {
    color: var(--text-heading);
    background: var(--surface-selected);
    border-color: var(--border-bright);
    border-left: 3px solid var(--gold);
}

#buttons .main-button:disabled {
    color: var(--text-muted);
    opacity: 0.55;
}

#buttons .main-button-status {
    align-items: flex-start;
}

#buttons .main-button-status-text {
    color: var(--text-muted);
    font-size: 11px;
}

#buttons .button-wrapper {
    width: 100%;
}

/* Native hidden remains authoritative even on flex/grid primitives. */
:is(.ui-page-header, .ui-actions, .ui-grid, .ui-field)[hidden] {
    display: none;
}

@media (max-width: 1279px) {
    #buttons {
        height: calc(100dvh - var(--shell-header-height));
        visibility: hidden;
    }

    body.nav-drawer-open #buttons {
        visibility: visible;
    }

    #buttons .main-button,
    #buttons summary {
        min-height: var(--control-height);
        box-sizing: border-box;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

.ui-visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

body .ui-control.ui-control {
    color: var(--text-main);
    background: var(--surface-input);
    border: 1px solid var(--border-muted);
    border-radius: var(--radius-control);
    box-shadow: none;
    min-height: var(--control-height);
    padding: var(--space-2) var(--space-3);
}

body .ui-control:disabled {
    color: var(--text-muted);
    opacity: 0.65;
}

body .ui-control[aria-invalid='true'] {
    border-color: var(--danger);
}

body .ui-control:focus-visible {
    border-color: var(--focus-ring);
}

@media (min-width: 1280px) {
    #buttons {
        padding-bottom: 90px;
    }
}

.ui-compact-table {
    border-collapse: collapse;
    color: var(--text-main);
    font-family: var(--font-body);
}

.ui-compact-table th {
    color: var(--text-heading);
    background: var(--bg-panel-strong);
}

.ui-compact-table :is(th, td) {
    border-bottom-color: var(--border-muted);
}

/* A common width contract, independent of each page's internal scroll owner. */
.ui-workspace.ui-workspace {
    box-sizing: border-box;
    min-width: 0;
    width: min(var(--content-wide), calc(100% - 24px));
    max-width: calc(100% - 24px);
}

/* Fit dense tabular workspaces to their columns while retaining the shared cap. */
.ui-workspace.ui-workspace--intrinsic {
    width: fit-content;
}

.arena-setup-background.ui-workspace {
    background: var(--surface-workspace);
    border: 1px solid var(--border-bright);
    border-radius: var(--radius-panel);
}