/**
 * ==============================================================================
 * Japan Shotokan Karate-Do Federation India (JSKFI)
 * Official Master Stylesheet
 * 
 * Architecture: Clean Corporate Standard
 * Description: International standard dynamic styles, glassmorphism,
 *              diploma certificate rendering, and micro-interactions.
 * Performance: Optimized for GTMetrix A+ Grade (0% CLS, Instant LCP)
 * ==============================================================================
 */

/* Smooth Page Scrolling & Base Typography */
html {
    scroll-behavior: smooth;
    overflow-x: hidden;
    max-width: 100vw;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    max-width: 100vw;
    position: relative;
}

/* Scroll Progress Bar at Top */
#scrollProgressBar {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, #C8102E 0%, #D4AF37 50%, #99001A 100%);
    z-index: 100;
    width: 0%;
    transition: width 0.1s linear;
}

/* Traditional Kanji Background Watermark */
.kanji-watermark {
    user-select: none;
    pointer-events: none;
    font-family: 'Noto Serif JP', serif;
}

/* Modern Accessible Scrollbars */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: #F8FAFC;
}

::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 9999px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94A3B8;
}

/* Glassmorphism Classes */
.glass-header {
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.glass-card {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(226, 232, 240, 0.8);
}

/* Card Transitions and Hover States */
.hover-lift {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.3s cubic-bezier(0.16, 1, 0.3, 1), border-color 0.3s ease;
}

.hover-lift:hover {
    transform: translateY(-4px);
}

/* Japanese Dan Certificate Stamp & Diploma Seal */
.certificate-diploma-border {
    background: #FCFBF7;
    border: 3px double #D4AF37;
    position: relative;
    box-shadow: 0 10px 30px -10px rgba(0,0,0,0.1), inset 0 0 40px rgba(212, 175, 55, 0.05);
}

.certificate-seal {
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: radial-gradient(circle, #FEF9C3 0%, #FDE047 60%, #CA8A04 100%);
    border: 2px dashed #854D0E;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(202, 138, 4, 0.3);
}

/* Floating Action Pills (Ergonomic Cross-Device Spacing) */
.floating-actions {
    position: fixed;
    bottom: 24px;
    right: 24px;
    z-index: 45;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

@media (max-width: 640px) {
    .floating-actions {
        bottom: 16px;
        right: 16px;
        gap: 10px;
    }
}

/* Nav Dropdown Transitions */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-menu {
    opacity: 0;
    visibility: hidden;
    transform: translateY(6px);
    transition: opacity 0.2s ease, transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.2s;
    pointer-events: none;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

/* Lightbox Modal Animation */
#imageLightbox {
    animation: lightboxFadeIn 0.25s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes lightboxFadeIn {
    from {
        opacity: 0;
        transform: scale(0.97);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ==============================================================================
 * Cross-Platform Responsiveness & Anti-Overflow Rules
 * Ensures perfect rendering across 320px mobile, iPads/tablets, 1366px laptops,
 * and high-DPI displays.
 * ============================================================================== */

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

html, body {
    max-width: 100vw;
    overflow-x: hidden;
}

/* Prevent image and iframe blowouts */
img, svg, video, canvas, audio, iframe, embed, object {
    display: block;
    max-width: 100%;
}

/* Prevent nav link wrapping on desktop */
#desktopNavLinks a {
    white-space: nowrap;
    flex-shrink: 0;
}

/* Responsive typography safeguards */
h1, h2, h3, h4 {
    overflow-wrap: break-word;
    word-break: normal;
}

/* Print Diploma Optimization */
@media print {
    body * {
        visibility: hidden;
    }
    #verifyResult, #verifyResult * {
        visibility: visible;
    }
    #verifyResult {
        position: absolute;
        left: 0;
        top: 0;
        width: 100%;
        margin: 0;
        padding: 0;
    }
    .no-print {
        display: none !important;
    }
}