/* =========================================================================
   Vodegero Design System — Baseline tokens + primitives
   Phase 1: foundation only. No page-level visual changes.
   ========================================================================= */

:root {
    /* Color */
    --color-bg: #0b1220;
    --color-surface: #111827;
    --color-surface-raised: #1f2937;
    --color-border: #1e293b;
    --color-border-subtle: #334155;
    --color-text: #e5e7eb;
    --color-text-muted: #94a3b8;
    --color-primary: #1d4ed8;
    --color-primary-hover: #2563eb;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #0ea5e9;

    /* Spacing — 4px base scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-pill: 9999px;

    /* Shadow */
    --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.4);
    --shadow-raised: 0 22px 55px rgba(15, 23, 42, 0.6);

    /* Motion */
    --transition-fast: 120ms ease-out;
    --transition-normal: 220ms ease-out;
    --transition-slow: 360ms ease-out;

    /* Typography */
    --font-sans: ui-sans-serif, system-ui, "Public Sans", "Segoe UI", Roboto, sans-serif;
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;

    /* Z-index scale */
    --z-base: 1;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-modal: 1050;
    --z-toast: 1080;
}

/* -------------------------------------------------------------------------
   Page transition wrapper — applied to <main id="pageRoot">.
   The .page-transition--visible class is added by ui-interactions.js after
   first paint and re-applied on htmx:afterSwap.
   ------------------------------------------------------------------------- */
/* NOTE: do not use `transform` here. A non-none transform on <main> creates
   a containing block, which traps Bootstrap's position:fixed modals/offcanvas
   inside the main element and breaks them. Opacity-only fade is safe.

   The element stays visible by default (opacity 1). Fade-out is opt-in via the
   .is-fading class added by JS during htmx swaps. This avoids "white screen"
   states if afterSwap fails to re-reveal the element for any reason. */
.page-transition {
    transition: opacity var(--transition-normal);
}

.page-transition.is-fading {
    opacity: 0;
}

/* Legacy compat: old code used `--visible` to mean "show". Treat its absence
   as visible-by-default; no opacity rule needed. Kept as a no-op so nothing
   breaks while the codebase is migrated. */
.page-transition--visible {
    opacity: 1;
}

/* -------------------------------------------------------------------------
   Toast region — fixed, top-right, polite live region.
   Toast partials append into #toastRegion via hx-swap="beforeend".
   ------------------------------------------------------------------------- */
.toast-region {
    position: fixed;
    top: var(--space-4);
    right: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    z-index: var(--z-toast);
    pointer-events: none;
}

.toast-region > * {
    pointer-events: auto;
}

/* -------------------------------------------------------------------------
   HTMX request indicator helper — opt-in via hx-indicator="#mySpinner".
   ------------------------------------------------------------------------- */
.htmx-indicator {
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.htmx-request .htmx-indicator,
.htmx-request.htmx-indicator {
    opacity: 1;
}

[aria-busy="true"] {
    cursor: progress;
}

/* =========================================================================
   Components
   Class names are namespaced with `ds-` to avoid colliding with Bootstrap.
   ========================================================================= */

/* ----- Button ----- */
.ds-btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    border-radius: var(--radius-pill);
    border: 1px solid transparent;
    font-family: var(--font-sans);
    font-weight: 600;
    line-height: 1;
    cursor: pointer;
    text-decoration: none;
    transition: transform var(--transition-fast),
                box-shadow var(--transition-fast),
                background-color var(--transition-normal),
                border-color var(--transition-normal),
                color var(--transition-normal);
}

.ds-btn:focus-visible {
    outline: 2px solid var(--color-primary-hover);
    outline-offset: 2px;
}

.ds-btn:disabled,
.ds-btn[aria-disabled="true"] {
    opacity: 0.6;
    cursor: not-allowed;
}

.ds-btn:not(:disabled):hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-soft);
}

.ds-btn:not(:disabled):active {
    transform: translateY(0) scale(0.99);
}

/* sizes */
.ds-btn-sm { padding: var(--space-2) var(--space-3); font-size: var(--text-xs); }
.ds-btn-md { padding: var(--space-2) var(--space-4); font-size: var(--text-sm); }
.ds-btn-lg { padding: var(--space-3) var(--space-6); font-size: var(--text-base); }

/* variants */
.ds-btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}
.ds-btn-primary:not(:disabled):hover { background-color: var(--color-primary-hover); border-color: var(--color-primary-hover); }

.ds-btn-secondary {
    background-color: var(--color-surface-raised);
    color: var(--color-text);
    border-color: var(--color-border-subtle);
}
.ds-btn-secondary:not(:disabled):hover { background-color: var(--color-surface); }

.ds-btn-ghost {
    background-color: transparent;
    color: var(--color-text);
    border-color: transparent;
}
.ds-btn-ghost:not(:disabled):hover { background-color: rgba(148, 163, 184, 0.12); }

.ds-btn-danger {
    background-color: var(--color-danger);
    color: #fff;
    border-color: var(--color-danger);
}
.ds-btn-danger:not(:disabled):hover { filter: brightness(1.05); }

/* loading */
.ds-btn-spinner {
    width: 0.875rem;
    height: 0.875rem;
    border-radius: var(--radius-pill);
    border: 2px solid currentColor;
    border-top-color: transparent;
    opacity: 0;
    animation: ds-spin 700ms linear infinite;
}
.ds-btn[data-loading="true"] .ds-btn-label { opacity: 0.65; }
.ds-btn[data-loading="true"] .ds-btn-spinner { opacity: 1; }
@keyframes ds-spin { to { transform: rotate(360deg); } }

/* ----- Alert / Toast ----- */
.ds-alert {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border-subtle);
    background-color: var(--color-surface);
    color: var(--color-text);
    font-size: var(--text-sm);
}
.ds-alert-title { font-weight: 600; margin-bottom: var(--space-1); }
.ds-alert-body  { flex: 1; }
.ds-alert-close {
    background: transparent; border: none; color: inherit;
    cursor: pointer; opacity: 0.6; padding: 0;
}
.ds-alert-close:hover { opacity: 1; }

.ds-alert-success { border-color: var(--color-success); color: var(--color-success); }
.ds-alert-warning { border-color: var(--color-warning); color: var(--color-warning); }
.ds-alert-error   { border-color: var(--color-danger);  color: var(--color-danger);  }
.ds-alert-info    { border-color: var(--color-info);    color: var(--color-info);    }

.ds-toast {
    min-width: 280px;
    max-width: 420px;
    box-shadow: var(--shadow-soft);
    background-color: var(--color-surface-raised);
    transform: translateX(0);
    animation: ds-toast-in var(--transition-normal) ease-out;
}
@keyframes ds-toast-in {
    from { opacity: 0; transform: translateX(20px); }
    to   { opacity: 1; transform: translateX(0); }
}

/* ----- Card ----- */
.ds-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}
.ds-card-raised { box-shadow: var(--shadow-soft); }
.ds-card-header,
.ds-card-footer { padding: var(--space-4) var(--space-6); }
.ds-card-header { border-bottom: 1px solid var(--color-border); }
.ds-card-footer { border-top: 1px solid var(--color-border); background-color: var(--color-surface-raised); }
.ds-card-body   { padding: var(--space-6); color: var(--color-text); }
.ds-card-title    { font-size: var(--text-lg); font-weight: 600; margin: 0; }
.ds-card-subtitle { font-size: var(--text-sm); color: var(--color-text-muted); margin-top: var(--space-1); }

/* ----- Form field ----- */
.ds-field {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}
.ds-field-label {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
}
.ds-field-required { color: var(--color-danger); margin-left: var(--space-1); }
.ds-field-input {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font: inherit;
    font-size: var(--text-sm);
    color: var(--color-text);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border-subtle);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.ds-field-input:focus-visible {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.25);
}
.ds-field-input[aria-invalid="true"] {
    border-color: var(--color-danger);
}
.ds-field-help    { font-size: var(--text-xs); color: var(--color-text-muted); }
.ds-field-error   { font-size: var(--text-xs); color: var(--color-danger); }

/* ----- Modal ----- */
.ds-modal-backdrop {
    position: fixed; inset: 0;
    background-color: rgba(2, 6, 23, 0.6);
    backdrop-filter: blur(2px);
    z-index: var(--z-modal);
    display: flex; align-items: center; justify-content: center;
    padding: var(--space-4);
}
.ds-modal {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-raised);
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    animation: ds-modal-in var(--transition-normal) ease-out;
}
.ds-modal-sm { max-width: 360px; }
.ds-modal-md { max-width: 560px; }
.ds-modal-lg { max-width: 800px; }
.ds-modal-header,
.ds-modal-footer { padding: var(--space-4) var(--space-6); }
.ds-modal-header { border-bottom: 1px solid var(--color-border); display: flex; justify-content: space-between; align-items: center; }
.ds-modal-footer { border-top: 1px solid var(--color-border); display: flex; justify-content: flex-end; gap: var(--space-2); }
.ds-modal-body   { padding: var(--space-6); }
.ds-modal-title  { font-size: var(--text-lg); font-weight: 600; margin: 0; }
@keyframes ds-modal-in {
    from { opacity: 0; transform: scale(0.96) translateY(8px); }
    to   { opacity: 1; transform: scale(1) translateY(0); }
}

/* ----- Skeleton ----- */
.ds-skeleton {
    background: linear-gradient(90deg, var(--color-surface) 0%, var(--color-surface-raised) 50%, var(--color-surface) 100%);
    background-size: 200% 100%;
    border-radius: var(--radius-md);
    animation: ds-skeleton-shimmer 1.4s ease-in-out infinite;
}
.ds-skeleton-text {
    height: 0.875rem;
    margin-bottom: var(--space-2);
    border-radius: var(--radius-sm);
}
.ds-skeleton-text:last-child { width: 60%; margin-bottom: 0; }
.ds-skeleton-card {
    height: 12rem;
    border-radius: var(--radius-lg);
}
@keyframes ds-skeleton-shimmer {
    0%   { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* -------------------------------------------------------------------------
   Reduced motion — collapse all design-system transitions to instant.
   ------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    .page-transition,
    .page-transition--visible,
    .htmx-indicator,
    .ds-btn,
    .ds-toast,
    .ds-modal,
    .ds-skeleton,
    .ds-btn-spinner {
        transition: none !important;
        transform: none !important;
        animation: none !important;
    }
}