/**
 * Sovereign Budget - Common Responsive Design & Anti-Overlap Base
 * Base variables, safe-area insets, touch ergonomics, and modal containment rules.
 */

:root {
    /* Safe Area Inset Variables with fallbacks */
    --safe-area-top: env(safe-area-inset-top, 0px);
    --safe-area-bottom: env(safe-area-inset-bottom, 0px);
    --safe-area-left: env(safe-area-inset-left, 0px);
    --safe-area-right: env(safe-area-inset-right, 0px);

    /* Anti-Overlap Z-Index Hierarchy Scale */
    --z-base: 1;
    --z-sidebar: 20;
    --z-sticky-header: 50;
    --z-bottom-nav: 100;
    --z-modal-backdrop: 1000;
    --z-toast: 1200;

    /* Ergonomic Touch Dimensions */
    --touch-min-target: 44px;
    --input-touch-height: 46px;
    --bottom-nav-height: 60px;
}

/* Prevent unwanted rubber-band scrolling on touch containers */
html, body {
    overscroll-behavior-y: none;
    -webkit-tap-highlight-color: transparent;
}

/* Touch Ergonomics: Guaranteed minimum touch targets */
button,
a,
input,
select,
.nav-item,
.mobile-nav-item,
.toggle-btn {
    touch-action: manipulation;
}

/* Universal Anti-Overlap Containment for Modals */
.modal-backdrop {
    z-index: var(--z-modal-backdrop) !important;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    height: 100dvh;
    padding: calc(16px + var(--safe-area-top)) 16px calc(16px + var(--safe-area-bottom)) 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow-y: auto;
    overscroll-behavior: contain;
    box-sizing: border-box;
}

/* Modal Content Box: strictly fits within viewport and never overflows off-screen */
.modal-content {
    display: flex;
    flex-direction: column;
    max-height: calc(100dvh - 36px);
    overflow: hidden;
    position: relative;
    box-sizing: border-box;
}

.modal-header {
    flex-shrink: 0;
}

.modal-body {
    flex: 1 1 auto;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    min-height: 0; /* Critical flex child overflow fix */
    padding-right: 4px;
}

.modal-footer {
    flex-shrink: 0;
    margin-top: 12px;
    padding-top: 8px;
}

/* Universal Table Scroll Container with Touch Inertia */
.table-scroll-container {
    width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    position: relative;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

.table-scroll-container::-webkit-scrollbar {
    height: 5px;
}

.table-scroll-container::-webkit-scrollbar-track {
    background: transparent;
}

.table-scroll-container::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
}

.table-scroll-container::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.28);
}

/* Toast Container Elevated Z-Index */
.toast-container {
    z-index: var(--z-toast) !important;
}

/* Currency input wrappers prevent symbol-number overlap */
.input-currency-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    width: 100%;
}

.input-currency-wrapper .currency-symbol {
    position: absolute;
    left: 14px;
    pointer-events: none;
    color: var(--color-text-muted);
    font-weight: 600;
    z-index: 2;
}

.input-currency-wrapper input {
    padding-left: 32px !important;
    width: 100%;
}