/**
 * BKTeach — cross-browser / cross-device baseline
 * Targets: Chrome, Safari, Firefox, Edge on Windows/macOS/Linux
 *           Chrome, Safari, Samsung Internet, Firefox on Android/iOS
 */

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

html {
    height: 100%;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
    scroll-behavior: smooth;
}

@supports (height: 100dvh) {
    html {
        height: 100dvh;
    }
}

body {
    margin: 0;
    min-height: 100%;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    min-height: 100dvh;
    max-width: 100%;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    touch-action: manipulation;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

button,
[type="button"],
[type="submit"],
[type="reset"],
a,
summary,
[role="button"] {
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

input,
select,
textarea,
button {
    font: inherit;
    color: inherit;
}

/* iOS Safari zooms inputs under 16px — keep readable controls on phones */
@media (max-width: 767.98px) {
    input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):not([type="color"]),
    select,
    textarea {
        font-size: 16px !important;
    }

    button,
    .ad-btn,
    .lp-btn,
    .sp-btn,
    .ad-icon-btn,
    .nav-link,
    .ad-dock__tab {
        min-height: 2.5rem;
    }
}

/* Notch / home-indicator safe areas (iPhone, Android gesture bars) */
.safe-top { padding-top: constant(safe-area-inset-top); padding-top: env(safe-area-inset-top, 0px); }
.safe-right { padding-right: constant(safe-area-inset-right); padding-right: env(safe-area-inset-right, 0px); }
.safe-bottom { padding-bottom: constant(safe-area-inset-bottom); padding-bottom: env(safe-area-inset-bottom, 0px); }
.safe-left { padding-left: constant(safe-area-inset-left); padding-left: env(safe-area-inset-left, 0px); }
.safe-x {
    padding-left: constant(safe-area-inset-left);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: constant(safe-area-inset-right);
    padding-right: env(safe-area-inset-right, 0px);
}
.safe-y {
    padding-top: constant(safe-area-inset-top);
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: constant(safe-area-inset-bottom);
    padding-bottom: env(safe-area-inset-bottom, 0px);
}

/* Momentum scrolling where overflow is intentional */
.scroll-touch {
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
}

/* Prefer dark browser chrome to match the app */
:root {
    color-scheme: dark;
    --app-safe-top: env(safe-area-inset-top, 0px);
    --app-safe-right: env(safe-area-inset-right, 0px);
    --app-safe-bottom: env(safe-area-inset-bottom, 0px);
    --app-safe-left: env(safe-area-inset-left, 0px);
    /* JS may refine --app-vh for older mobile browsers */
    --app-vh: 1vh;
}

.min-h-app {
    min-height: 100vh;
    min-height: calc(var(--app-vh, 1vh) * 100);
    min-height: 100dvh;
}

.h-app {
    height: 100vh;
    height: calc(var(--app-vh, 1vh) * 100);
    height: 100dvh;
}

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

/* Print: keep content readable */
@media print {
    body {
        background: #fff !important;
        color: #000 !important;
    }
    .public-mobile-nav,
    .ad-dock,
    .sp-bottom,
    .guest-header,
    .ad-rail,
    .ad-topbar {
        display: none !important;
    }
}