*, *::before, *::after { box-sizing: border-box; }

html { min-height: 100%; scroll-behavior: smooth; }

body {
    min-height: 100vh;
    margin: 0;
    background: var(--page-bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: var(--text-md);
    line-height: 1.5;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

::selection { background: var(--selection); }

button, input, select, textarea { font: inherit; }
button { color: inherit; }
button, a, input, select, textarea { -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
img { max-width: 100%; }

.skip-link {
    position: fixed;
    top: var(--space-3);
    left: var(--space-3);
    z-index: 1000;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    background: var(--brand-600);
    color: #fff;
    text-decoration: none;
    transform: translateY(-160%);
    transition: transform var(--motion-fast) var(--ease-standard);
}
.skip-link:focus { transform: translateY(0); }

.sr-only {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    padding: 0 !important;
    margin: -1px !important;
    overflow: hidden !important;
    clip: rect(0, 0, 0, 0) !important;
    white-space: nowrap !important;
    border: 0 !important;
}

:where(button, a, input, select, textarea, [tabindex]):focus { outline: none; }
:where(button, a, input, select, textarea, [tabindex]):focus-visible {
    outline: 2px solid var(--focus-ring);
    outline-offset: 2px;
}

.icon {
    width: 1em;
    height: 1em;
    flex: 0 0 auto;
    display: inline-block;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.8;
    stroke-linecap: round;
    stroke-linejoin: round;
    vertical-align: -0.14em;
}

.btn, .primary-btn, .ghost-btn, .copy-btn, .pill-btn, .chip-btn, .letter-btn, .picker-item, .icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-height: var(--control-md);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: background var(--motion-fast) var(--ease-standard), border-color var(--motion-fast) var(--ease-standard), color var(--motion-fast) var(--ease-standard), transform var(--motion-fast) var(--ease-standard), opacity var(--motion-fast) var(--ease-standard);
}

.btn, .primary-btn, .ghost-btn { padding: 0 var(--space-4); }
.btn:hover, .ghost-btn:hover, .copy-btn:hover, .icon-btn:hover { background: var(--surface-hover); border-color: var(--border-strong); }
.btn:active, .primary-btn:active, .ghost-btn:active, .copy-btn:active, .icon-btn:active { transform: translateY(1px); }
.btn:disabled, .primary-btn:disabled, .ghost-btn:disabled, .copy-btn:disabled, .icon-btn:disabled {
    opacity: .48;
    cursor: not-allowed;
    transform: none;
}

.btn-primary, .primary-btn {
    border-color: var(--brand-600);
    background: var(--brand-600);
    color: #fff;
    box-shadow: var(--shadow-sm);
}
.btn-primary:hover, .primary-btn:hover { background: var(--brand-700); border-color: var(--brand-700); }
.btn-ghost, .ghost-btn { background: transparent; }
.btn-danger { border-color: var(--danger-600); background: var(--danger-600); color: #fff; }
.btn-warning { border-color: #f1c98d; background: var(--warning-50); color: var(--warning-600); }
.btn-sm { min-height: var(--control-sm); padding-inline: var(--space-3); font-size: var(--text-sm); }

[data-busy="true"] { position: relative; cursor: wait; }
.ui-spinner {
    width: 16px;
    height: 16px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: ui-spin .7s linear infinite;
}
@keyframes ui-spin { to { transform: rotate(360deg); } }

.field { display: grid; gap: 6px; min-width: 0; }
.field label, .field-label { color: var(--text-secondary); font-size: var(--text-sm); font-weight: 600; }
.field-hint, .helper { color: var(--text-secondary); font-size: var(--text-xs); line-height: 1.6; }
.field-error { color: var(--danger-600); font-size: var(--text-xs); line-height: 1.5; }

input, select, textarea {
    width: 100%;
    min-width: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--surface);
    color: var(--text);
    transition: border-color var(--motion-fast) var(--ease-standard), box-shadow var(--motion-fast) var(--ease-standard), background var(--motion-fast) var(--ease-standard);
}
input, select { min-height: var(--control-lg); padding: 0 var(--space-3); }
textarea { min-height: 132px; padding: var(--space-3); resize: vertical; }
input::placeholder, textarea::placeholder { color: var(--text-tertiary); }
input:hover, select:hover, textarea:hover { border-color: var(--border-strong); }
input:focus, select:focus, textarea:focus { border-color: var(--focus-ring); box-shadow: 0 0 0 3px color-mix(in srgb, var(--focus-ring) 18%, transparent); }
input[aria-invalid="true"], select[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: var(--danger-600); }

.tag, .tag-chip, .meta-chip, .admin-chip, .recent-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 26px;
    padding: 3px 9px;
    border: 1px solid var(--border);
    border-radius: var(--radius-pill);
    background: var(--surface-subtle);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    line-height: 1.3;
}

.status-dot { width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.tone-success { color: var(--success-600); }
.tone-warning { color: var(--warning-600); }
.tone-danger { color: var(--danger-600); }
.tone-info { color: var(--info-600); }

.empty, .empty-state, .state-panel {
    display: grid;
    justify-items: center;
    gap: var(--space-2);
    min-height: 180px;
    padding: var(--space-8) var(--space-4);
    border: 1px dashed var(--border-strong);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-align: center;
}
.empty h3, .empty-state h3, .state-panel h3 { margin: 0; color: var(--text); font-size: var(--text-lg); }
.empty p, .empty-state p, .state-panel p { max-width: 520px; margin: 0; }
.state-icon { width: 40px; height: 40px; display: grid; place-items: center; border-radius: var(--radius-md); background: var(--surface-subtle); color: var(--text-secondary); font-size: var(--text-xl); }

.skeleton-list { display: grid; gap: var(--space-2); }
.skeleton-row {
    min-height: 70px;
    border-radius: var(--radius-md);
    background: linear-gradient(90deg, var(--surface-subtle) 25%, var(--surface-hover) 50%, var(--surface-subtle) 75%);
    background-size: 200% 100%;
    animation: skeleton-shift 1.4s ease-in-out infinite;
}
@keyframes skeleton-shift { to { background-position: -200% 0; } }

.toast, .admin-toast {
    position: fixed;
    right: var(--space-5);
    bottom: var(--space-5);
    z-index: 220;
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    max-width: min(380px, calc(100vw - 24px));
    padding: var(--space-3) var(--space-4);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--surface-raised);
    color: var(--text);
    box-shadow: var(--shadow-md);
    opacity: 0;
    transform: translateY(10px);
    pointer-events: none;
    transition: opacity var(--motion-medium) var(--ease-standard), transform var(--motion-medium) var(--ease-standard);
    white-space: pre-line;
}
.toast.active, .admin-toast.active { opacity: 1; transform: translateY(0); }
.toast[data-tone="success"], .admin-toast[data-tone="success"] { border-color: color-mix(in srgb, var(--success-600) 42%, var(--border)); }
.toast[data-tone="danger"], .admin-toast[data-tone="danger"] { border-color: color-mix(in srgb, var(--danger-600) 42%, var(--border)); }

.modal, .ui-confirm {
    position: fixed;
    inset: 0;
    z-index: 180;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    background: var(--overlay);
}
.modal.active, .ui-confirm.active { display: flex; }
.modal-card, .preview-modal-card, .ui-confirm-card {
    width: min(720px, 100%);
    max-height: calc(100vh - 48px);
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    background: var(--surface-raised);
    box-shadow: var(--shadow-overlay);
}
.modal-head, .modal-foot {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--border);
}
.modal-foot { justify-content: flex-end; border-top: 1px solid var(--border); border-bottom: 0; }
.modal-body { min-height: 0; max-height: calc(100vh - 180px); overflow: auto; padding: var(--space-5); }
.modal-close, .icon-btn {
    width: var(--control-md);
    height: var(--control-md);
    min-height: var(--control-md);
    padding: 0;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--text-secondary);
    cursor: pointer;
}

.ui-confirm { z-index: 240; }
.ui-confirm-card { width: min(460px, 100%); padding: var(--space-6); }
.ui-confirm-icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: var(--radius-md); background: var(--danger-50); color: var(--danger-600); font-size: var(--text-xl); }
.ui-confirm-card h2 { margin: var(--space-4) 0 var(--space-2); font-size: var(--text-xl); }
.ui-confirm-card p { margin: 0; color: var(--text-secondary); white-space: pre-line; }
.ui-confirm-actions { display: flex; justify-content: flex-end; gap: var(--space-2); margin-top: var(--space-6); }

@media (max-width: 768px) {
    .toast, .admin-toast { right: var(--space-3); bottom: calc(var(--space-3) + env(safe-area-inset-bottom)); }
    .empty-state .btn, .state-panel .btn { min-height: 44px; }
    .modal { padding: 0; align-items: flex-end; }
    .modal-card, .preview-modal-card { width: 100%; max-height: 100dvh; border-radius: var(--radius-lg) var(--radius-lg) 0 0; }
    .modal-body { max-height: calc(100dvh - 150px); }
    .ui-confirm { padding: var(--space-4); }
    .ui-confirm-card { padding: var(--space-5); }
}