/**
 * Socratic Platform - Touch & Gesture Optimization Architecture
 * Provides fine-grained touch-action boundaries, overscroll protection,
 * hardware acceleration layers, and safe-area insets for MAUI Blazor Hybrid & Web.
 */

/* ─── 1. Global Viewport & Touch Protection ─────────────────── */
*, *::before, *::after {
    box-sizing: border-box;
}

html, body {
    /* Prevent rubber-banding / pull-to-refresh overscroll bounce */
    overscroll-behavior-x: none;
    overscroll-behavior-y: none;
    
    /* Eliminate default gray tap highlight on mobile WebKit/Blink */
    -webkit-tap-highlight-color: transparent;
    
    /* Disable accidental system callout on long press (iOS) */
    -webkit-touch-callout: none;
    
    /* Prevent unwanted text selection during gestures */
    -webkit-user-select: none;
    user-select: none;
}

/* Allow text selection specifically for editable inputs and reading containers */
input, textarea, [contenteditable="true"], .selectable-text {
    -webkit-user-select: text;
    user-select: text;
    -webkit-touch-callout: default;
}

/* ─── 2. Touch Action Primitives ────────────────────────────── */

/* 
 * touch-action: pan-y
 * Essential for horizontal swipers, tabs, and carousels.
 * Allows the user to freely scroll the page vertically without gesture hijacking,
 * while allowing horizontal swipes to be captured by component handlers.
 */
.touch-pan-y,
[data-gesture="swipe-horizontal"],
.swipe-container-x {
    touch-action: pan-y !important;
}

/* 
 * touch-action: pan-x
 * For vertical nested lists inside horizontally swipeable cards.
 */
.touch-pan-x,
[data-gesture="swipe-vertical"],
.swipe-container-y {
    touch-action: pan-x !important;
}

/* 
 * touch-action: none
 * For custom interactive canvases, drag-to-reorder, signature pads, and sliders.
 * Completely disables browser-level scrolling/pinch gesture handling.
 */
.touch-none,
[data-gesture="interactive-canvas"],
.drag-handle {
    touch-action: none !important;
}

/* 
 * touch-action: manipulation
 * Disables the 300ms double-tap-to-zoom delay on buttons and links.
 */
.touch-manipulation,
button,
a,
md-filled-button,
md-outlined-button,
md-text-button,
md-elevated-button,
md-icon-button,
.interactive-action {
    touch-action: manipulation;
}

/* ─── 3. Smooth Touch Scroll Containers ─────────────────────── */

.touch-scroll-x {
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-x: contain;
    touch-action: pan-y;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.touch-scroll-x::-webkit-scrollbar {
    display: none;
}

.touch-scroll-y {
    overflow-y: auto;
    overflow-x: hidden;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior-y: contain;
    touch-action: pan-x;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.touch-scroll-y::-webkit-scrollbar {
    display: none;
}

/* ─── 4. Hardware Acceleration & Compositor Layers ──────────── */

/* Promotes animated elements to a dedicated GPU layer (60/120 FPS) */
.gpu-layer,
.swipe-card,
.drawer-panel,
.md-drawer-backdrop {
    transform: translate3d(0, 0, 0);
    backface-visibility: hidden;
    -webkit-backface-visibility: hidden;
    perspective: 1000px;
    will-change: transform, opacity;
}

/* ─── 5. Safe Area Insets Protection (Notch, Home Pill) ─────── */

.safe-area-top {
    padding-top: env(safe-area-inset-top, 0px);
}

.safe-area-bottom {
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

.safe-area-left {
    padding-left: env(safe-area-inset-left, 0px);
}

.safe-area-right {
    padding-right: env(safe-area-inset-right, 0px);
}

.safe-area-all {
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
}

/* Edge swipe guard: 16px safe buffer to prevent triggering system back gestures */
.edge-swipe-guard-left {
    margin-left: max(16px, env(safe-area-inset-left, 0px));
}

.edge-swipe-guard-right {
    margin-right: max(16px, env(safe-area-inset-right, 0px));
}

/* ─── 5. Web Components Anti-Flicker & Hydration Isolation ─── */
md-dialog:not(:defined) {
    display: none !important;
}

/* ─── 6. M3 Expressive Grid Primitives & Z-Index Tokens ─────── */
:root {
    --m3-z-content: 1;
    --m3-z-sticky: 10;
    --m3-z-drawer: 50;
    --m3-z-dialog: 100;
    --m3-z-popover: 200;
}

/* Reusable Grid Primitives for Flexbox Elimination */
.grid-flow-col {
    display: grid;
    grid-auto-flow: column;
    grid-auto-columns: max-content;
    align-items: center;
}

.grid-stack {
    display: grid;
    grid-auto-flow: row;
}

.grid-split {
    display: grid;
    grid-template-columns: 1fr auto;
    align-items: center;
}

.grid-center {
    display: grid;
    place-items: center;
}

/* ─── 7. Universal Alignment & Defect Fixes ─────────────────── */

/* Prevent horizontal page blowouts causing unwanted scrollbars */
html, body {
    overflow-x: hidden;
    max-width: 100vw;
}

/* Universal font and alignment for md-icon (prevents delay and text morphing) */
md-icon {
    font-family: 'Material Symbols Outlined' !important;
    font-weight: normal;
    font-style: normal;
    font-size: var(--md-icon-size, 24px);
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-feature-settings: 'liga';
    font-feature-settings: 'liga';
    -webkit-font-smoothing: antialiased;
    width: var(--md-icon-size, 24px);
    height: var(--md-icon-size, 24px);
    vertical-align: middle;
    flex-shrink: 0;
}

/* Icons inside buttons in default slot (unslotted) - fix vertical misalignment */
md-filled-button md-icon:not([slot]),
md-outlined-button md-icon:not([slot]),
md-elevated-button md-icon:not([slot]),
md-text-button md-icon:not([slot]),
md-filled-tonal-button md-icon:not([slot]) {
    vertical-align: middle;
    margin-inline-end: 8px;
    font-size: var(--md-icon-size, 18px);
    width: var(--md-icon-size, 18px);
    height: var(--md-icon-size, 18px);
    line-height: 1;
}

/* Trailing unslotted icons in buttons */
md-filled-button > *:last-child:is(md-icon:not([slot])),
md-outlined-button > *:last-child:is(md-icon:not([slot])),
md-elevated-button > *:last-child:is(md-icon:not([slot])),
md-text-button > *:last-child:is(md-icon:not([slot])),
md-filled-tonal-button > *:last-child:is(md-icon:not([slot])) {
    margin-inline-end: 0;
    margin-inline-start: 8px;
}

/* Avatar button circular icon centering (no margin offsets) */
.avatar-button md-icon,
md-outlined-button.avatar-button md-icon {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    margin: 0 !important;
    margin-inline-end: 0 !important;
    margin-inline-start: 0 !important;
}

/* HTML button elements and button-like chips */
button,
.btn,
.delivery-preset-chip,
.date-preset-chip,
.map-toolbar-chip,
.map-toolbar-segment,
.showcase-card-btn,
.search-route-btn,
.search-clear-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
}

button md-icon,
.btn md-icon,
.delivery-preset-chip md-icon,
.date-preset-chip md-icon,
.map-toolbar-chip md-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    width: var(--md-icon-size, 1.25em);
    height: var(--md-icon-size, 1.25em);
    font-size: var(--md-icon-size, 1.25em);
    line-height: 1;
    flex-shrink: 0;
}

/* Dialog content formatting context: prevents collapsing margins and false horizontal scrollbars */
md-dialog [slot="content"] {
    display: flow-root;
    box-sizing: border-box;
    overflow-x: hidden;
    max-width: 100%;
    min-width: 0;
}

/* Dialog actions container: prevents action buttons from squishing or overflowing */
md-dialog [slot="actions"] {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 8px;
}