/* 
 * Home Initial Preloader for HDL2Chips
 * Premium interactive 3D segmented progress loader.
 */

#hdl-home-preloader {
    --color-primary: #3b82f6; /* Website default primary blue */
    --color-neutral: rgba(226, 232, 240, 0.45); /* Soft background segments */
    background: radial-gradient(circle at 50% 50%, #ffffff 0%, #f8fafc 100%);
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 2147483649 !important;
    perspective: 1000px;
    transition: opacity 0.5s ease, visibility 0.5s;
    overflow: hidden;
}

/* Premium Tech Dot Matrix Pattern */
#hdl-home-preloader::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: radial-gradient(rgba(59, 130, 246, 0.08) 1.5px, transparent 1.5px);
    background-size: 24px 24px;
    pointer-events: none;
    z-index: 1;
}

.dark-mode #hdl-home-preloader {
    --color-neutral: rgba(30, 41, 59, 0.5); /* Slate gray transparent segments */
    background: radial-gradient(circle at 50% 50%, #0f172a 0%, #020617 100%);
}

.dark-mode #hdl-home-preloader::before {
    background-image: radial-gradient(rgba(59, 130, 246, 0.12) 1.5px, transparent 1.5px);
}

/* The Centered 3D Card */
.loader {
    display: flex;
    position: absolute;
    top: 50%;
    left: 50%;
    transform-style: preserve-3d;
    transition: transform 0.15s linear;
    translate: -50% -50%;
    animation: idle-tilt 6s ease-in-out infinite;
    pointer-events: none; /* Let hovers pass through to grid */
    z-index: 2;
}

@keyframes idle-tilt {
    0% { transform: rotateX(-12deg) rotateY(-12deg); }
    25% { transform: rotateX(12deg) rotateY(-8deg); }
    50% { transform: rotateX(8deg) rotateY(12deg); }
    75% { transform: rotateX(-8deg) rotateY(8deg); }
    100% { transform: rotateX(-12deg) rotateY(-12deg); }
}

/* Brand Header */
.brand-header {
    position: absolute;
    bottom: calc(100% + 40px);
    left: 50%;
    transform: translateX(-50%) translateZ(60px);
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 280px;
    text-align: center;
}

.preloader-logo {
    width: 80px;
    height: auto;
    margin-bottom: 12px;
    filter: drop-shadow(0 4px 15px rgba(59, 130, 246, 0.2));
    animation: logo-pulse-glow 2.5s ease-in-out infinite;
}

@keyframes logo-pulse-glow {
    0%, 100% { filter: drop-shadow(0 4px 15px rgba(59, 130, 246, 0.2)); transform: scale(1); }
    50% { filter: drop-shadow(0 8px 25px rgba(59, 130, 246, 0.45)); transform: scale(1.05); }
}

.preloader-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.7rem;
    font-weight: 900;
    margin: 0;
    letter-spacing: 0.05em;
    background: linear-gradient(135deg, #3b82f6 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 4px 12px rgba(59, 130, 246, 0.05);
}

/* Loader Text style */
.text {
    position: absolute;
    top: -30px;
    left: 10px;
    color: var(--color-primary);
    font-family: 'JetBrains Mono', monospace;
    font-weight: 700;
    font-size: 0.72rem;
    letter-spacing: 0.15em;
    transform: translateZ(20px);
    margin: 0;
    opacity: 0.85;
}

/* Loader Segment Styling */
.loader span {
    position: relative;
    height: 32px;
    background-color: var(--color-neutral);
    border-top: 3px solid var(--color-primary);
    border-bottom: 3px solid var(--color-primary);
    box-shadow: 0 0 10px rgba(59, 130, 246, 0.1);
    transition: background-color 0.3s;
}

.loader span::before {
    content: "";
    position: absolute;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: var(--color-primary);
    box-shadow: 0 0 15px rgba(59, 130, 246, 0.5);
    clip-path: inset(0 100% 0 0);
    animation: progress calc(var(--i) * 2.75ms) linear calc(var(--d) * 2.75ms) forwards;
}

.loader > span:nth-of-type(1) {
    width: 100px;
    border-left: 3px solid var(--color-primary);
    border-radius: 12px 0 0 12px;
}

.loader > span:nth-of-type(1)::before {
    left: 0;
    width: 100%;
    border-radius: 8px 0 0 8px;
}

.loader > span:nth-of-type(2) {
    width: 10px;
}

.loader > span:nth-of-type(2)::before {
    left: -1px;
    width: calc(100% + 2px);
}

.loader > span:nth-of-type(3) {
    width: 50px;
    transform: translateZ(40px);
}

.loader > span:nth-of-type(3)::before {
    left: -1px;
    width: calc(100% + 2px);
}

.loader > span:nth-of-type(4) {
    width: 40px;
    border-right: 3px solid var(--color-primary);
    border-radius: 0 12px 12px 0;
}

.loader > span:nth-of-type(4)::before {
    right: 0;
    width: 100%;
    border-radius: 0 8px 8px 0;
}

/* Grooves (Side/Internal walls for 3D shape) */
.groove {
    position: relative;
    transform-style: preserve-3d;
}

.groove > span {
    display: inline-block;
}

.groove > :first-child,
.groove > :last-child {
    position: absolute;
}

.groove:nth-of-type(1) > :nth-child(1) {
    width: 50px;
    transform: rotateY(90deg);
    transform-origin: left;
}

.groove:nth-of-type(1) > :nth-child(2) {
    width: 30px;
    transform: translateZ(-50px);
}

.groove:nth-of-type(1) > :nth-child(3) {
    width: 50px;
    transform: rotateY(-90deg) translateX(-50px);
    transform-origin: left;
}

.groove:nth-of-type(2) > :nth-child(1) {
    width: 100px;
    transform: rotateY(90deg);
    transform-origin: left;
}

.groove:nth-of-type(2) > :nth-child(2) {
    width: 15px;
    transform: translateZ(-100px);
}

.groove:nth-of-type(2) > :nth-child(3) {
    width: 140px;
    transform: rotateY(-90deg) translateX(-100px);
    transform-origin: left;
}

.groove:nth-of-type(3) > :nth-child(1) {
    width: 60px;
    transform: rotateY(90deg) translateX(-40px);
    transform-origin: left;
}

.groove:nth-of-type(3) > :nth-child(2) {
    width: 30px;
    transform: translateZ(-20px);
}

.groove:nth-of-type(3) > :nth-child(3) {
    width: 20px;
    transform: rotateY(-90deg) translateX(-20px);
    transform-origin: left;
}

@keyframes progress {
    to {
        clip-path: inset(0 0 0 0);
    }
}

/* Preloader is hidden via JS (opacity:0 → display:none) before page-ready is added */

body.page-ready main,
body.page-ready #footer-placeholder,
body.page-ready .course-app-layout {
    opacity: 1 !important;
    visibility: visible !important;
    transform: translateY(0) !important;
    transition: opacity 0.6s ease-out, transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

body.page-ready #navbar-placeholder,
body.page-ready #announcement-placeholder {
    opacity: 1 !important;
    visibility: visible !important;
    pointer-events: auto;
    transition: none;
}

/* Keep main content and layout containers completely hidden until page-ready */
body.is-home:not(.page-ready) main,
body.is-courses:not(.page-ready) main,
body.is-lesson:not(.page-ready) main,
body.is-certificate:not(.page-ready) main,
body.is-category:not(.page-ready) main,
body.is-profile:not(.page-ready) main,
body.is-blog:not(.page-ready) main,
body.is-interview-prep:not(.page-ready) main,
body.is-editor:not(.page-ready) main,
body.is-terms:not(.page-ready) main,
body.is-about:not(.page-ready) main,
body.is-privacy:not(.page-ready) main {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

body.is-home:not(.page-ready) #footer-placeholder,
body.is-courses:not(.page-ready) #footer-placeholder,
body.is-lesson:not(.page-ready) #footer-placeholder,
body.is-lesson:not(.page-ready) .course-app-layout,
body.is-certificate:not(.page-ready) #footer-placeholder,
body.is-category:not(.page-ready) #footer-placeholder,
body.is-profile:not(.page-ready) #footer-placeholder,
body.is-blog:not(.page-ready) #footer-placeholder,
body.is-interview-prep:not(.page-ready) #footer-placeholder,
body.is-editor:not(.page-ready) #footer-placeholder,
body.is-terms:not(.page-ready) #footer-placeholder,
body.is-about:not(.page-ready) #footer-placeholder,
body.is-privacy:not(.page-ready) #footer-placeholder {
    opacity: 0;
    transform: translateY(10px);
}

/* Keep navbar and announcement fully hidden (not just transparent)
   until the preloader completes — prevents them appearing above the
   preloader overlay due to their high z-index */
body.is-home:not(.page-ready) #navbar-placeholder,
body.is-home:not(.page-ready) #announcement-placeholder,
body.is-courses:not(.page-ready) #navbar-placeholder,
body.is-courses:not(.page-ready) #announcement-placeholder,
body.is-lesson:not(.page-ready) #navbar-placeholder,
body.is-lesson:not(.page-ready) #announcement-placeholder,
body.is-certificate:not(.page-ready) #navbar-placeholder,
body.is-certificate:not(.page-ready) #announcement-placeholder,
body.is-category:not(.page-ready) #navbar-placeholder,
body.is-category:not(.page-ready) #announcement-placeholder,
body.is-profile:not(.page-ready) #navbar-placeholder,
body.is-profile:not(.page-ready) #announcement-placeholder,
body.is-blog:not(.page-ready) #navbar-placeholder,
body.is-blog:not(.page-ready) #announcement-placeholder,
body.is-interview-prep:not(.page-ready) #navbar-placeholder,
body.is-interview-prep:not(.page-ready) #announcement-placeholder,
body.is-editor:not(.page-ready) #navbar-placeholder,
body.is-editor:not(.page-ready) #announcement-placeholder,
body.is-editor:not(.page-ready) #editor-header-placeholder,
body.is-editor:not(.page-ready) .problem-drawer,
body.is-terms:not(.page-ready) #navbar-placeholder,
body.is-terms:not(.page-ready) #announcement-placeholder,
body.is-about:not(.page-ready) #navbar-placeholder,
body.is-about:not(.page-ready) #announcement-placeholder,
body.is-privacy:not(.page-ready) #navbar-placeholder,
body.is-privacy:not(.page-ready) #announcement-placeholder {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}

/* Also hide any injected nav/announcement directly */
body.is-home:not(.page-ready) .navbar-premium,
body.is-home:not(.page-ready) .announcement-bar,
body.is-courses:not(.page-ready) .navbar-premium,
body.is-courses:not(.page-ready) .announcement-bar,
body.is-lesson:not(.page-ready) .navbar-premium,
body.is-lesson:not(.page-ready) .announcement-bar,
body.is-certificate:not(.page-ready) .navbar-premium,
body.is-certificate:not(.page-ready) .announcement-bar,
body.is-category:not(.page-ready) .navbar-premium,
body.is-category:not(.page-ready) .announcement-bar,
body.is-profile:not(.page-ready) .navbar-premium,
body.is-profile:not(.page-ready) .announcement-bar,
body.is-blog:not(.page-ready) .navbar-premium,
body.is-blog:not(.page-ready) .announcement-bar,
body.is-interview-prep:not(.page-ready) .navbar-premium,
body.is-interview-prep:not(.page-ready) .announcement-bar,
body.is-editor:not(.page-ready) .navbar-premium,
body.is-editor:not(.page-ready) .announcement-bar,
body.is-terms:not(.page-ready) .navbar-premium,
body.is-terms:not(.page-ready) .announcement-bar,
body.is-about:not(.page-ready) .navbar-premium,
body.is-about:not(.page-ready) .announcement-bar,
body.is-privacy:not(.page-ready) .navbar-premium,
body.is-privacy:not(.page-ready) .announcement-bar {
    opacity: 0 !important;
    visibility: hidden !important;
    pointer-events: none !important;
}