/* Cross-browser reset for pixel-perfect rendering */
*, *::before, *::after {
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    border: none;
    /* Keep background centered vertically and horizontally */
    background-position: center center;
    background-repeat: no-repeat;
    /* Use cover so the image fills the viewport while maintaining aspect ratio */
    -webkit-background-size: contain;
    -moz-background-size: contain;
    -o-background-size: contain;
    background-size: contain;
    /* Optional: uncomment to keep the background fixed during scroll
       background-attachment: fixed; */
}

/* Enhanced accessibility helpers */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: #fff;
    color: #000;
    padding: 8px 12px;
    z-index: 10000;
    transition: top 0.2s ease;
    text-decoration: none;
    border-radius: 0 0 4px 0;
    font-weight: 600;
}
.skip-link:focus { 
    top: 8px; 
    outline: 2px solid #0d6efd;
    outline-offset: 2px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.visually-hidden {
    position: absolute !important;
    height: 1px; width: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}

iframe {
    display: block;               /* avoid inline-gap issues */
    min-height: 100vh;
    width: 100%;
    border: none;
    background: transparent;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.bg-s {
    background: url('../../assets/images/bg-s.jpg') lightgray 50% / cover no-repeat;
    background-position: top left;
    -webkit-background-size: cover;
    -moz-background-size: cover;
    -o-background-size: cover;
}

/* Custom container widths */
.narrow-container {
    max-width: 800px; /* sensible default for narrow layout */
    margin-left: auto;
    margin-right: auto;
    padding-left: 1rem;
    padding-right: 1rem;
}

/* Extra narrow variant */
.narrow-container.extra-narrow {
    max-width: 540px;
}

/* Make the iframe inside respect the container width */
.narrow-container iframe {
    width: 100%;
}

/* Responsive breakpoints (match Bootstrap 5) */
@media (min-width: 300px) { /* sm */
    .narrow-container {
        max-width: 100%;
        margin-top: 0px !important;
        border-radius: 0px !important;
    }
    iframe {
        min-height: 1600px;
    }
}

@media (min-width: 576px) { /* sm */
    .narrow-container {
        max-width: 100%;
        margin-top: 0px !important;
        border-radius: 0px !important;
    }
    iframe {
        min-height: 1300px;
    }
}

@media (min-width: 768px) { /* md */
    iframe {
        min-height: 1600px;
    }
}

@media (min-width: 850px) { /* md */
    body {
        background-image: url('../../assets/images/bg-l.jpg');
    }
    .narrow-container {
        max-width: 550px;
        margin-right: 8%;
        margin-top: auto !important;
        border-radius: 32px !important;
    }
    .bg-s {
        display: none;
    }
    iframe {
        min-height: 1300px;
    }
}

@media (min-width: 1100px) { /* lg */
    .narrow-container {
        max-width: 600px;
        margin-right: 16%;
    }
    iframe {
        min-height: 1250px;
    }
}

@media (min-width: 1300px) { /* xl */
    .narrow-container {
        max-width: 700px;
        margin-right: 18%;
    }
    iframe {
        min-height: 1300px;
    }
}

@media (min-width: 1500px) { /* xxl */
    .narrow-container {
        max-width: 800px;
        margin-right: 18%;
    }
}

@media (min-width: 1600px) { /* xxl */
    .narrow-container {
        max-width: 800px;
        margin-right: 20%;
    }
}

@media (min-width: 1800px) { /* xxl */
    .narrow-container {
        max-width: 800px;
        margin-right: 25%;
    }
    body {
        /* Use cover so the image fills the viewport while maintaining aspect ratio */
        background-position: center left;
    }
}

/* Ensure the extra-narrow variant remains constrained */
@media (min-width: 576px) {
    .narrow-container.extra-narrow {
        max-width: 540px;
    }
}

/* Offset helpers to nudge narrow containers to the right */
/* Use transform for visual offset without affecting document flow */
.narrow-container {
    transition: transform 200ms ease, margin-right 300ms ease, margin-left 300ms ease, left 300ms ease, max-width 300ms ease;
    will-change: transform, margin-right, margin-left, left, max-width;
}

/* Helper to explicitly animate max-width changes when toggling classes */
.animate-max-width {
    transition: max-width 350ms cubic-bezier(.2,.8,.2,1);
}

/* Position the container so its center sits at 75% of the viewport width on larger screens */
.narrow-container.at-75 {
    position: relative;
    left: 75%;
    transform: translateX(-50%); /* move the element so its center is at left:75% */
}

/* Make .at-75 behave responsively: on small screens (mobile), make it full width and reset offsets */
@media (max-width: 767.98px) {
    .narrow-container.at-75 {
        position: static;
        left: auto;
        transform: none;
        max-width: 100%;
        margin-left: 0.5rem;
        margin-right: 0.5rem;
        padding-left: 0.5rem;
        padding-right: 0.5rem;
    }
}

.narrow-container.shift-right-xs { transform: translateX(10px); }
.narrow-container.shift-right-sm { transform: translateX(20px); }
.narrow-container.shift-right-md { transform: translateX(40px); }
.narrow-container.shift-right-lg { transform: translateX(80px); }

/* Percent-based offsets (useful for proportional shifting) */
.narrow-container.shift-right-5p { transform: translateX(5%); }
.narrow-container.shift-right-10p { transform: translateX(10%); }

/* Responsive offsets: only apply on medium screens and up */
@media (min-width: 768px) {
    .narrow-container.shift-right-md-up { transform: translateX(48px); }
}

@media (min-width: 1200px) {
    .narrow-container.shift-right-xl-up { transform: translateX(96px); }
}

/* Align to the right edge (push container fully to the right) */
.narrow-container.align-right {
    margin-left: auto;
    margin-right: 0;
    transform: none; /* clear transforms when aligning */
}

/* If you want the container to visually overlap the right side, use negative right margin */
.narrow-container.overlap-right {
    margin-right: -40px;
}

/* Utility: animate margin-right between two values using CSS variables
   Usage: add class `animate-margin-right` and optionally set
     --mr-from: 0px; --mr-to: -40px; --anim-duration: 1s; --anim-iterations: infinite/1; */
.animate-margin-right {
    --mr-from: 0px;
    --mr-to: -40px;
    --anim-duration: 1s;
    --anim-iterations: infinite;
    animation: animate-margin-right var(--anim-duration) ease-in-out var(--anim-iterations) alternate;
}

@keyframes animate-margin-right {
    from { margin-right: var(--mr-from); }
    to   { margin-right: var(--mr-to); }
}

/* Iframe preloader styles */
.iframe-preloader {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    text-align: center;
    background: rgba(255,255,255,0.95);
    z-index: 9999;
    transition: opacity 0.45s ease, visibility 0.45s;
    pointer-events: auto;
    box-sizing: border-box;
    padding: 0;
}
.iframe-preloader.hidden {
    opacity: 0;
    visibility: hidden;
}
.iframe-preloader .spinner {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    box-sizing: border-box;
    border: 4px solid rgba(0,0,0,0.08);
    border-top: 4px solid #0d6efd; /* Bootstrap primary blue for visibility */
    animation: spin 1s linear infinite;
    margin: 0 0 8px 0;
    display: block;
    background: transparent;
    /* Fallback absolute centering (robust if flex is overridden) */
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}
.iframe-preloader .preloader-text {
    color: #111;
    font-size: 14px;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Ensure the narrow-container is positioned relative for absolute preloader */
.narrow-container { position: relative; }

/* Ensure iframe sits below the preloader overlay */
.narrow-container iframe { position: relative; z-index: 1; }

/* Enhanced focus indicators for better accessibility */
iframe:focus {
    outline: 3px solid #0d6efd;
    outline-offset: 2px;
}

button:focus,
.btn:focus {
    outline: 2px solid #0d6efd;
    outline-offset: 2px;
    box-shadow: 0 0 0 0.2rem rgba(13, 110, 253, 0.25);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .skip-link {
        background: #000;
        color: #fff;
        border: 2px solid #fff;
    }
    
    .iframe-preloader {
        background: #fff;
        border: 2px solid #000;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    .skip-link,
    .iframe-preloader,
    .narrow-container,
    .animate-margin-right {
        transition: none;
        animation: none;
    }
    
    .spinner {
        animation: none;
    }
}

/* Print styles */
@media print {
    .skip-link,
    .iframe-preloader,
    .bg-s {
        display: none !important;
    }
    
    .narrow-container {
        max-width: 100% !important;
        margin: 0 !important;
        padding: 0 !important;
    }
}