/* --- Global Styles & Theme --- */
:root {
    --font-heading: "Poppins", sans-serif;
    --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
    --font-khmer: "Kantumruy Pro", sans-serif;
    /* Header Colors */
    --header-bg-fallback: #0a0f1f;
    --header-text: #ffffff;
    --header-accent: #00e5ff; /* Cyan accent for title animation glow */
    --header-overlay-color: rgba(0, 0, 0, 0.6);
    --facebook-color: #ffffff;
    --facebook-hover-color: #e3f2fd;
    --github-color: #ffffff;
    --github-hover-color: #e0e0e0;
    /* Body Colors (Light Theme) */
    --body-bg-color: #f8f9fa;
    --body-text-color: #495057;
    --body-heading-color: #212529;
    --body-link-color: #007bff;
    --body-link-hover-color: #0056b3;
    --body-border-color: #dee2e6;
    --body-card-bg: #ffffff;
    --body-card-border: #dee2e6;
    --body-card-shadow: rgba(0, 0, 0, 0.08);
    --body-card-hover-shadow: rgba(0, 0, 0, 0.12);
    --body-card-hover-border: #adb5bd;
    --footer-bg: #0d1b2a;
    --footer-text-color: #f8f9fa;
    /* Carousel Colors */
    --swiper-theme-color: var(--body-link-color);
    --carousel-title-color: #6c757d;
    --carousel-title-hover-color: var(--body-link-color);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    background-color: var(--body-bg-color);
    color: var(--body-text-color);
    min-height: 100vh;
    line-height: 1.6;
    font-weight: 400;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

div#scroll-progress-bar {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 5px;
    background: linear-gradient(
        90deg,
        rgba(42, 123, 155, 1) 0%,
        rgba(87, 199, 133, 1) 50%,
        rgba(237, 221, 83, 1) 100%
    );
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
    z-index: 500;
}

#warningPopover {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: rgba(255, 50, 50, 0.9); /* Red with some transparency */
    color: white;
    padding: 20px 30px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    z-index: 1000;
    opacity: 0; /* Start hidden */
    visibility: hidden; /* Start not interactive */
    transition: opacity 0.5s ease-in-out, visibility 0.5s ease-in-out;
    font-family: sans-serif;
    text-align: center;
    min-width: 250px;
}

#warningPopover.show {
    opacity: 1; /* Fade in */
    visibility: visible; /* Become interactive */
}

#warningPopover p {
    margin: 0;
    font-size: 1.2em;
    font-weight: bold;
}
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 25px;
}

/* --- Main Heading Area (Full Width, Image Background) --- */
.main-heading-area {
    padding: 20vh 0 18vh 0; /* Adjusted padding for more height */
    min-height: 500px; /* Minimum height */
    position: relative;
    /* overflow: hidden; */
    /* color: var(--header-text); */
    /* background-color: var(--header-bg-fallback); */
    /* ACTION REQUIRED: Ensure 'image_ce8183.png' is in the correct path or update this URL */
    /* background-image: url("images/main_header.jpg"); */
    /* background-size: cover; */
    /* background-position: center center; Default for larger screens */
    /* background-repeat: no-repeat; */
    /* z-index: 1; */
    display: flex;
    align-items: center;
    justify-content: center;
}

.main-heading-area::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: var(--header-overlay-color);
    /* z-index: 1; Behind content, above background image */
}

/* Inner container to constrain and center content */
.header-content-container {
    position: relative;
    z-index: 2; /* Above overlay */
    text-align: center; /* Center the title block */
}

/* Title block */
.header-title-block {
    display: inline-block; /* Allows centering */
    text-align: left; /* Align text inside this block left */
}

.main-heading-area h1 {
    font-family: var(--font-heading);
    font-size: 4.5rem; /* Increased size for impact */
    color: var(--header-text);
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.1;
    text-shadow: 0 3px 8px rgba(0, 0, 0, 0.7); /* Stronger shadow */
    text-align: left; /* Keep text left-aligned within its block */
    display: inline-block; /* For letter animation */
}
/* Letter animation for main title */
.main-heading-area h1 .char {
    display: inline-block;
    opacity: 0;
    transform: translateY(-25px) scale(0.7); /* Adjusted initial transform */
    animation: revealChar 0.6s cubic-bezier(0.215, 0.61, 0.355, 1) forwards; /* Smoother easing */
    margin: 0 -0.02em; /* Adjust letter spacing if needed */
    text-shadow: 0px 0px 0 rgb(-32, 88, 157), 1px 1px 0 rgb(-64, 56, 125),
        2px 2px 0 rgb(-96, 24, 93), 3px 3px 0 rgb(-127, -7, 62),
        4px 4px 0 rgb(-159, -39, 30), 5px 5px 0 rgb(-191, -71, 0),
        6px 6px 0 rgb(-223, -103, 0), 7px 7px 0 rgb(-255, -135, 0),
        8px 8px 0 rgb(-287, -167, 0), 9px 9px 8px rgba(28, 227, 48, 0.6),
        9px 9px 1px rgba(28, 227, 48, 0.5), 0px 0px 8px rgba(28, 227, 48, 0.2);
}
@keyframes revealChar {
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

/* --- Social Icons --- */
.social-icons {
    margin-top: 15px;
    margin-bottom: 0;
    text-align: left; /* Aligned with title */
}
.social-icons a.social-link {
    margin: 0 18px 0 0;
    text-decoration: none;
    transition: transform 0.2s ease, opacity 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    vertical-align: middle;
    opacity: 0.9;
}
.social-icons a.social-link svg {
    width: 30px;
    height: 30px;
    display: block;
    transition: fill 0.2s ease;
}
.social-link.facebook svg {
    fill: var(--facebook-color);
}
.social-link.github svg {
    fill: var(--github-color);
}
.social-icons a.social-link:hover {
    transform: scale(1.15);
    opacity: 1;
}
.social-link.facebook:hover svg {
    fill: var(--facebook-hover-color);
}
.social-link.github:hover svg {
    fill: var(--github-hover-color);
}

/* --- About Section --- */
.about-section {
    margin-top: 40px;
    margin-bottom: 40px;
}
.about-section h2 {
    font-family: var(--font-heading);
    color: var(--body-heading-color);
    font-size: 2.1rem;
    margin-bottom: 30px;
    text-align: left;
    padding-bottom: 15px;
    font-weight: 600;
}
.about-section p {
    font-family: var(--font-khmer);
    color: var(--body-text-color);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 15px;
    text-align: left;
}
.about-section p:last-child {
    margin-bottom: 0;
}

/* --- Jump Navigation Section --- */
.jump-nav-section {
    margin-bottom: 50px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 10px;
}
.jump-nav-left {
    flex-grow: 1;
}
.jump-nav-section .nav-title {
    font-size: 0.95rem;
    color: #6c757d;
    margin-bottom: 15px;
}
.jump-nav-links a {
    color: var(--body-link-color);
    text-decoration: none;
    margin-right: 25px;
    font-weight: 500;
    font-size: 1rem;
    transition: color 0.2s ease, text-decoration 0.2s ease;
    display: inline-block;
    position: relative;
    margin-bottom: 5px;
}
.jump-nav-links a::after {
    content: "";
    position: absolute;
    width: 100%;
    transform: scaleX(0);
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: #0087ca;
    transition: transform 0.25s ease-out;
}
.jump-nav-links a:hover::after {
    transform: scaleX(1);
}
.jump-nav-links a:hover {
    color: var(--body-link-hover-color);
}
.last-updated {
    font-size: 0.85rem;
    color: #6c757d;
    text-align: right;
    white-space: nowrap;
    padding-top: 3px;
}

/* --- Main Content Area --- */
main {
    padding-bottom: 60px;
    flex-grow: 1;
}

/* --- Project Section --- */
.project-section {
    margin-bottom: 60px;
}
.project-section h2 {
    font-family: var(--font-heading);
    font-size: 2.1rem;
    color: var(--body-heading-color);
    margin-bottom: 30px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--body-border-color);
    font-weight: 600;
    text-align: left;
}
/* --- Projects Container --- */
.projects-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 30px;
    padding: 10px 0;
}

/* --- Project Card (Original Light theme card from user's code) --- */
main .project-card {
    background: var(--body-card-bg);
    border-radius: 5px;
    overflow: hidden;
    box-shadow: 0 4px 8px var(--body-card-shadow);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: var(--body-text-color);
    border: 1px solid var(--body-card-border);
    position: relative;
    width: 100%;
}
main .project-card img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
    border-bottom: 1px solid var(--body-card-border);
}
main .project-card .card-content {
    padding: 20px 15px;
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
}
main .project-card .card-content h3 {
    font-family: var(--font-body);
    font-size: 1.2rem;
    margin-bottom: 0;
    color: orange;
    font-weight: 700;
    line-height: 1.3;
}
main .project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px var(--body-card-hover-shadow);
    border-color: var(--body-card-hover-border);
}

/* --- Logo Carousel Section --- */
.logo-carousel-section {
    margin-top: 40px;
}
.logo-carousel-section h3 {
    font-family: var(--font-heading);
    font-size: 1.6rem;
    color: #343a40;
    margin-bottom: 35px;
    text-align: center;
}
.company-logo-swiper {
    width: 100%;
    padding: 10px 0 40px 0;
    overflow: hidden;
}

.company-logo-swiper .swiper-slide {
    text-align: center;
    background: transparent;
}
.company-logo-swiper .swiper-slide a {
    display: block;
    text-decoration: none;
    transition: transform 0.2s ease;
}
.company-logo-swiper .swiper-slide a:hover {
    transform: scale(1.03);
}
.company-logo-swiper .swiper-slide img {
    display: block;
    width: 100%;
    height: 120px;
    object-fit: cover;
    margin-bottom: 8px;
    border-radius: 4px;
    border: 1px solid #eee;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}
.company-logo-swiper .swiper-slide a:hover img {
    border-color: #ccc;
    box-shadow: 0 3px 8px rgba(0, 0, 0, 0.1);
}
.logo-title {
    display: block;
    text-align: center;
    font-size: 0.85rem;
    color: var(--carousel-title-color);
    padding: 5px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    transition: color 0.2s ease;
}
.company-logo-swiper .swiper-slide a:hover .logo-title {
    color: var(--carousel-title-hover-color);
}
.swiper-pagination-bullet-active {
    background-color: var(--swiper-theme-color);
}

/* --- Footer --- */
footer {
    text-align: center;
    padding-bottom: 25px;
    margin-top: 40px;
    font-size: 0.9rem;
    color: var(--footer-text-color);
    /* border-top: 1px solid var(--body-border-color); */
    background-color: var(--footer-bg);
}

.shape-fill {
    fill: #f8f9fa;
}
.shape-fill:nth-child(2) {
    fill: #f8f9fa;
}
.shape-fill:nth-child(1) {
    fill: white;
}
.scroll-to-top {
    display: none;
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 100;
    border: none;
    outline: none;
    background: linear-gradient(
        90deg,
        rgba(42, 123, 155, 1) 0%,
        rgba(87, 199, 133, 1) 50%,
        rgba(237, 221, 83, 1) 100%
    );
    color: white;
    cursor: pointer;
    border-radius: 5px;
    padding: 10px 20px;
    font-size: 16px;
    opacity: 0.8;
}
.scroll-to-top::after {
    content: "\25B2";
    margin-left: 5px;
}
.scroll-to-top:hover {
    opacity: 1;
    background-color: #333;
}
#site-view-count {
    display: block;
    margin-top: 5px;
    font-size: 0.85em;
    color: var(--footer-text-color);
}

/* --- Responsiveness Adjustments --- */
@media (max-width: 992px) {
    .container {
        max-width: 960px;
        padding: 0 20px;
    }
    .header-content-container {
        flex-direction: column;
        align-items: center;
    } /* Stack title block */
    .header-title-block {
        text-align: center;
    } /* Center title block on mobile */
    .main-heading-area h1 {
        text-align: center;
        font-size: 3rem;
    }
    .social-icons {
        text-align: center;
    }
    .projects-container {
        grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
        gap: 30px;
    }
}
@media (min-width: 768px) and (max-width: 1199.98px) {
    .projects-container {
        grid-template-columns: repeat(3, 1fr);
    }
    main .project-card img {
        height: 170px;
    }
    main .card-content h3 {
        font-size: 1.15rem;
    }
}
@media (min-width: 1200px) {
    .projects-container {
        grid-template-columns: repeat(4, 1fr);
        gap: 25px;
    }
    main .project-card img {
        height: 160px;
    }
    main .card-content h3 {
        font-size: 1.1rem;
    }
}
@media (max-width: 767.98px) {
    .main-heading-area {
        background-position: 75% 50%; /* Focus on middle-right */
        padding: 15vh 0 12vh 0;
    }
    .main-heading-area h1 {
        font-size: 2.8rem;
    }
    .project-section h2,
    .about-section h2 {
        font-size: 1.9rem;
    }
    .about-section p {
        font-size: 0.95rem;
    }
    .jump-nav-links a {
        margin-right: 15px;
        font-size: 0.9rem;
    }
    .projects-container {
        grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
        gap: 25px;
    }
    main .project-card img {
        height: 170px;
    }
    main .card-content h3 {
        font-size: 1.1rem;
    }
    .logo-carousel-section h3 {
        font-size: 1.4rem;
    }
    .company-logo-swiper .swiper-slide img {
        height: 100px;
    }
    .logo-title {
        font-size: 0.8rem;
    }
}
@media (max-width: 576px) {
    .main-heading-area {
        background-position: right center; /* Focus on right */
        padding: 12vh 0 10vh 0;
    }
    .main-heading-area h1 {
        font-size: 2.2rem;
    }
    .social-icons a svg {
        width: 28px;
        height: 28px;
    }
    .project-section h2,
    .about-section h2 {
        font-size: 1.6rem;
    }
    .about-section {
        padding: 0;
    }
    .about-section p {
        font-size: 0.9rem;
        line-height: 1.7;
    }
    .jump-nav-section {
        flex-direction: column;
        align-items: flex-start;
    }
    .last-updated {
        text-align: left;
        margin-top: 10px;
    }
    .jump-nav-links {
        /* display: block;
        position: relative; */
        margin-bottom: 10px;
        margin-right: 0;
    }
    .projects-container {
        grid-template-columns: 1fr;
        gap: 25px;
    }
    main .project-card img {
        height: 180px;
    }
    main .card-content h3 {
        font-size: 1.2rem;
    }
    footer {
        font-size: 0.85rem;
    }
    .company-logo-swiper .swiper-slide img {
        height: 90px;
    }
}

.lines {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    margin: auto;
    width: 90vw;
    display: flex;
    justify-content: space-between; /* Distribute lines evenly */
}

.line {
    position: relative;
    width: 2px;
    height: 100%;
    /*background: #ffffff;  /* Line color */
    overflow: hidden;
}

.line::after {
    content: "";
    display: block;
    position: absolute;
    height: 15vh;
    width: 100%;
    top: -50%;
    left: 0;
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #ffffff 75%,
        #ffffff 100%
    );
    animation: drop 7s 0s infinite;
    animation-fill-mode: forwards;
    animation-timing-function: cubic-bezier(0.4, 0.26, 0, 0.97);
}

/* Different colors for each line's pseudo-element */
.line:nth-child(1)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #ff4500 75%,
        #ff4500 100%
    );
    animation-delay: 0.5s;
}

.line:nth-child(2)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #32cd32 75%,
        #32cd32 100%
    );
    animation-delay: 1s;
}

.line:nth-child(3)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #1e90ff 75%,
        #1e90ff 100%
    );
    animation-delay: 1.5s;
}

.line:nth-child(4)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #ffd700 75%,
        #ffd700 100%
    );
    animation-delay: 2s;
}

.line:nth-child(5)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #8a2be2 75%,
        #8a2be2 100%
    );
    animation-delay: 2.5s;
}

.line:nth-child(6)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #20b2aa 75%,
        #20b2aa 100%
    );
    animation-delay: 3s;
}

.line:nth-child(7)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #dc143c 75%,
        #dc143c 100%
    );
    animation-delay: 3.5s;
}

.line:nth-child(8)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #00fa9a 75%,
        #00fa9a 100%
    );
    animation-delay: 4s;
}

.line:nth-child(9)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #ff1493 75%,
        #ff1493 100%
    );
    animation-delay: 4.5s;
}

.line:nth-child(10)::after {
    background: linear-gradient(
        to bottom,
        rgba(255, 255, 255, 0) 0%,
        #00bfff 75%,
        #00bfff 100%
    );
    animation-delay: 5s;
}

@keyframes drop {
    0% {
        top: -50%;
    }
    100% {
        top: 110%;
    }
}