/* === Variables === */
    :root {
        --color-bg: #0a0a0a;
        --color-bg-section: #f7f7f7;
        --color-card-bg: rgba(122, 117, 77, 0.45);
        --color-card-bg-hover: rgba(122, 117, 77, 0.55);
        --color-card-text: #ffffff;
        --color-text: #2a2a2a;
        --color-text-light: #6e6e6e;
        --color-gold: #d4af37;
        --color-gold-dark: #a17f1a;
        --font-main: 'Poppins', 'Segoe UI', sans-serif;
        --content-max-width: 700px;
        --transition-fast: 0.3s ease-in-out;
        --header-height: 80px;
        --footer-height: 30px;
        --section-gap: 2rem;
    }

    /* === Reset & Base === */
    html { scroll-padding-top: var(--header-height); }
    * { margin: 0; padding: 0; box-sizing: border-box; }
    body {
        background-color: var(--color-bg-section);
        color: var(--color-text);
        font-family: var(--font-main), serif;
        line-height: 1.6;
        scroll-behavior: smooth;
        height: 100vh;
        overflow: hidden;
        position: relative;
    }
    body::before {
        content: '';
        position: fixed;
        inset: 0;
        background-image: url("../assets/logo_background.png");
        background-repeat: no-repeat;
        background-position: right center;
        background-size: contain;
        opacity: 0.5;
        z-index: 0;
        pointer-events: none;
        transition: background-position 0.3s ease;
    }
    body > * { position: relative; z-index: 1; }
    h1, h2, h3 {
        color: var(--color-gold);
        margin-bottom: 0.5em;
        text-shadow: 0 1px 2px rgba(0, 0, 0, 0.6);
    }
    p { text-shadow: 0 1px 1px rgba(0, 0, 0, 0.25); }
    a {
        color: var(--color-gold);
        text-decoration: none;
        transition: color var(--transition-fast);
    }
    a:hover { color: var(--color-gold-dark); }

    /* === Layout Containers === */
    .container {
        max-width: var(--content-max-width);
        margin: 0 auto;
        padding: 2rem;
    }
    .section {
        height: 100vh;
        padding: 0 var(--section-gap);
        display: flex;
        flex-direction: column;
        justify-content: center;
        overflow: hidden;
    }

    .section-inner {
        display: flex;
        flex-direction: row;
        align-items: center;
        justify-content: center;
        width: 100%;
        max-width: 100%;
        overflow: hidden;
        /* Remove gap if not needed */
    }

    .section-content {
        flex: 1 1 0%;
        max-width: var(--content-max-width);
        min-width: 0;
        width: 100%;
        overflow: visible;
    }

    /* === Section Variants === */
    .section.narrow .section-content { text-align: center; }
    .section.full .section-inner { justify-content: center; }
    .section.full .section-content {
        max-width: 100%;
        text-align: center;
    }

    /* === Snap Scroll === */
    .snap-container {
        scroll-snap-type: y mandatory;
        overflow-y: auto;
        height: 100vh;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    .snap-container::-webkit-scrollbar { display: none; }
    .snap-child { scroll-snap-align: start; }

    /* === Header === */
    .sticky-header {
        height: var(--header-height);
        position: sticky;
        top: 0;
        z-index: 100;
        background-color: var(--color-bg);
        border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
    }
    .sticky-header.scrolled { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3); }
    .nav-container {
        width: 80%;
        margin: 0 auto;
        display: flex;
        justify-content: space-between;
        align-items: center;
    }
    .logo { height: 80px; }
    .header-social-icons {
        display: flex;
        gap: 1rem;
        align-items: center;
    }
    .header-social-icons a {
        color: var(--color-gold);
        font-size: 1.25rem;
    }
    .header-social-icons a:hover { color: var(--color-gold-dark); }

.lang-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: 1rem;
}

#langToggleBtn {
    background: transparent;
    color: var(--color-gold);
    border: 2px solid var(--color-gold);
    padding: 0.5rem 1rem;
    font-weight: bold;
    text-transform: uppercase;
    font-family: var(--font-main);
    font-size: 0.9rem;
    letter-spacing: 0.05em;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-fast);
}

#langToggleBtn:hover {
    background-color: var(--color-gold);
    color: var(--color-bg);
    box-shadow: 0 0 8px var(--color-gold);
}


/* === Hamburger Menu === */
    .hamburger {
        width: 30px;
        height: 22px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        cursor: pointer;
    }
    .hamburger div {
        height: 4px;
        background-color: var(--color-gold);
        border-radius: 2px;
        transition: all var(--transition-fast);
    }
    .hamburger.open div:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .hamburger.open div:nth-child(2) { opacity: 0; }
    .hamburger.open div:nth-child(3) {
        transform: rotate(-45deg) translate(6px, -6px);
    }

    /* === Dropdown === */
    .dropdown-menu {
        position: fixed;
        top: var(--header-height);
        left: 0;
        width: 100%;
        z-index: 2000;
        display: flex;
        flex-direction: column;
        align-items: center;
        background-color: rgba(10, 10, 10, 0.95);
        overflow: hidden;
        max-height: 0;
        opacity: 0;
        pointer-events: none;
        transform: translateY(-10px);
        transition: max-height 0.4s, opacity 0.4s, transform 0.4s;
    }
    .dropdown-menu.active {
        max-height: 500px;
        opacity: 1;
        transform: translateY(0);
        pointer-events: auto;
    }
    .dropdown-menu a {
        padding: 1rem 2rem;
        color: var(--color-gold);
        font-size: 1.5rem;
        text-align: center;
        width: 100%;
    }
    .dropdown-menu a:hover {
        background-color: rgba(255, 255, 255, 0.05);
    }
    .dropdown-menu a.active {
        color: var(--color-gold-dark);
        text-decoration: underline;
    }

    /* === Buttons & Cards === */
    .btn {
        background: transparent;
        color: var(--color-gold);
        border: 2px solid var(--color-gold);
        padding: 0.75rem 1.5rem;
        font-weight: bold;
        text-transform: uppercase;
        cursor: pointer;
        transition: all var(--transition-fast);
    }
    .btn:hover {
        background: var(--color-gold);
        color: var(--color-bg);
        box-shadow: 0 0 10px var(--color-gold);
    }
    .card {
        background: var(--color-card-bg);
        color: var(--color-card-text);
        padding: 1.5rem;
        border-radius: 12px;
        border: 1px solid rgba(255, 255, 255, 0.1);
        backdrop-filter: blur(8px);
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
        width: 100%;
        transition: background 0.3s, box-shadow 0.3s;
    }
    .card:hover {
        background: var(--color-card-bg-hover);
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    }
    input, textarea {
        width: 100%;
        padding: 0.75rem;
        margin-bottom: 1rem;
        font-size: 1rem;
        border-radius: 6px;
        border: 1px solid rgba(255, 255, 255, 0.15);
        background: var(--color-card-bg);
        color: var(--color-card-text);
        backdrop-filter: blur(8px);
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }
    input::placeholder, textarea::placeholder {
        color: rgba(255, 255, 255, 0.75);
    }
    input:hover, textarea:hover {
        background: var(--color-card-bg-hover);
        box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
    }

    /* === Animations === */
    .fade-in {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.6s ease, transform 0.6s ease;
    }
    .fade-in.visible {
        opacity: 1;
        transform: translateY(0);
    }

    /* === Scroll Buttons === */
    .scroll-down-btn, .scroll-up-btn {
        position: fixed;
        left: 90%;
        transform: translateX(-50%);
        z-index: 50;
        background: var(--color-gold);
        color: var(--color-bg);
        border: none;
        border-radius: 50%;
        width: 48px;
        height: 48px;
        font-size: 1.5rem;
        cursor: pointer;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.4);
    }
    .scroll-down-btn { bottom: 80px; animation: bounce 2s infinite; }
    .scroll-up-btn { bottom: 160px; animation: bounce-up 2s infinite; }
    .scroll-down-btn.hidden, .scroll-up-btn.hidden {
        opacity: 0;
        pointer-events: none;
    }
    @keyframes bounce {
        0%, 100% { transform: translateX(-50%) translateY(0); }
        50% { transform: translateX(-50%) translateY(-10px); }
    }
    @keyframes bounce-up {
        0%, 100% { transform: translateX(-50%) translateY(0); }
        50% { transform: translateX(-50%) translateY(10px); }
    }

    /* === Footer === */
    .site-footer {
        position: fixed;
        bottom: 0;
        left: 0;
        width: 100%;
        height: var(--footer-height);
        background: var(--color-bg);
        color: var(--color-text);
        font-size: 0.85rem;
        padding: 0 1rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        z-index: 100;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        transition: transform 0.3s ease, box-shadow 0.3s ease;
        box-sizing: border-box;
    }
    .footer-social-icons {
        display: flex;
        gap: 1rem;
    }
    .footer-social-icons a {
        color: var(--color-gold);
        font-size: 1rem;
        transition: color 0.3s, transform 0.3s;
    }
    .footer-social-icons a:hover {
        color: var(--color-gold-dark);
        transform: scale(1.2);
    }

    /* === About Section === */
    .about-grid {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        justify-content: center;
        gap: 2rem;
        max-width: 750px;
    }

    .about-text {
        flex: 1 1 350px;
        min-width: 280px;
    }

    /* Bullet-style text */
    .about-bullets {
        list-style: none;
        padding: 0;
        margin: 1rem 0 2rem;
    }

    .about-bullets li {
        position: relative;
        padding-left: 1.5rem;
        margin-bottom: 1rem;
        font-size: 1rem;
        line-height: 1.6;
    }

    .about-bullets li::before {
        content: "•";
        position: absolute;
        left: 0;
        color: var(--color-gold);
        font-size: 1.2rem;
        line-height: 1;
    }


    /* === Flip Card Carousel === */
    .flip-carousel {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
        width: 100%;
        height: 100%;
        perspective: 1000px;
        position: relative;
    }
    .flip-carousel, .flip-carousel * {
        user-select: none;
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        -webkit-user-drag: none;
    }
    .flip-card {
        width: 100%;
        max-width: 550px;
        min-width: 300px;
        aspect-ratio: 1 / 2;
        max-height: 650px;
        cursor: grab;
        position: relative;
    }
    .flip-hint-btn {
        position: absolute;
        top: -2.5rem;
        right: 0;
        z-index: 15;
        background: var(--color-gold);
        color: var(--color-bg);
        border: none;
        font-size: 1rem;
        padding: 0.4rem 0.6rem;
        border-radius: 6px;
        cursor: pointer;
        box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
        transition: background 0.3s, transform 0.2s;
    }
    .flip-hint-btn:hover {
        background: var(--color-gold-dark);
        transform: scale(1.05);
    }
    .flip-card-inner {
        width: 100%;
        height: 100%;
        position: relative;
        transform-style: preserve-3d;
        transition: transform 0.3s ease;
    }
    .flip-card-front,
    .flip-card-back {
        position: absolute;
        width: 100%;
        height: 100%;
        backface-visibility: hidden;
        background: var(--color-card-bg);
        color: var(--color-card-text);
        border-radius: 12px;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        padding: 1rem;
        box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
        text-align: center;
    }
    .flip-card-front img,
    .flip-card-back img,
    .project-logo {
        max-height: 150px;
        object-fit: contain;
        border-radius: 8px;
        margin-bottom: 1rem;
    }
    .flip-card-back { transform: rotateY(180deg); }
    .flip-overlay-hint {
        font-size: 0.9rem;
        color: var(--color-card-text);
        background: rgba(255, 255, 255, 0.15);
        padding: 0.3rem 0.8rem;
        border-radius: 6px;
        margin-top: 0.6rem;
        animation: pulse-hint 2.2s infinite ease-in-out;
        align-self: center;
        opacity: 0.85;
    }
    @keyframes pulse-hint {
        0%   { opacity: 0.3; transform: scale(1); }
        50%  { opacity: 1; transform: scale(1.05); }
        100% { opacity: 0.3; transform: scale(1); }
    }
    .flip-dots {
        display: flex;
        gap: 0.5rem;
    }
    .flip-dot {
        width: 10px;
        height: 10px;
        border-radius: 50%;
        background: var(--color-gold-dark);
        opacity: 0.4;
        transition: opacity 0.3s;
        cursor: pointer;
    }
    .flip-dot.active {
        opacity: 1;
        background: var(--color-gold);
    }
    .try-btn {
        background: var(--color-gold);
        color: var(--color-bg);
        padding: 0.5rem 1rem;
        border-radius: 6px;
        text-decoration: none;
        font-weight: bold;
        margin-top: 1rem;
        display: inline-block;
    }

    /* === Skill Tree === */
    .skill-section { position: relative; overflow: visible; }
    .skill-tree-wrapper {
        position: relative;
        width: 100%;
        height: 100%;
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    #skill-tree {
        position: relative;
        min-width: 350px;
        width: 100%;
        height: 720px;
        overflow: hidden;
        touch-action: manipulation;
    }
    .skill-lines {
        position: absolute;
        width: 100%;
        height: 100%;
        pointer-events: none;
        z-index: 1;
        top: 0;
        left: 0;
    }
    .skill-card {
        position: absolute;
        aspect-ratio: 1 / 1;
        width: clamp(60px, 8vw, 100px);
        background: white;
        border-radius: 8px;
        box-shadow: 0 0 4px rgba(0, 0, 0, 0.2);
        display: flex;
        justify-content: center;
        align-items: center;
        font-size: clamp(18px, 2vw, 24px);
        cursor: pointer;
        z-index: 2;
        transition: transform 0.2s ease;
        user-select: none;
        -webkit-user-drag: none;
    }
    .skill-card:hover { transform: scale(1.05); }
    .skill-card i {
        font-size: 1.5em;
        color: #222;
    }
    .skill-group-label {
        position: absolute;
        left: 1rem;
        font-weight: bold;
        font-size: 1rem;
        color: #888;
        z-index: 3;
        background-color: rgba(255, 255, 255, 0.8);
        padding: 0.25rem 0.5rem;
        border-radius: 4px;
        pointer-events: none;
        white-space: nowrap;
    }
    .skill-zone {
        position: absolute;
        z-index: 0;
        opacity: 0.08;
        pointer-events: none;
        background: transparent;
        border-radius: 50%;
    }
    svg#skill-svg {
        width: 100%;
        height: 100%;
        overflow: visible;
        position: absolute;
        top: 0;
        left: 0;
        z-index: 1;
        pointer-events: auto;
    }

    /* === Skill Info Card === */
    .skill-info-card {
        position: absolute;
        z-index: 99;
        pointer-events: auto;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(4px);
        box-shadow: -4px 0 12px rgba(0, 0, 0, 0.15);
        transition: transform 0.4s ease;
        overflow-y: auto;
        display: flex;
        flex-direction: column;
        justify-content: flex-start;
        padding: 2rem 1.5rem;
        color: #333;
    }
    @media (min-width: 768px) {
        .skill-info-card {
            position: fixed;
            top: var(--header-height);
            right: -600px;
            width: 600px;
            max-width: 90vw;
            height: calc(100vh - var(--header-height) - var(--footer-height));
            border-top-left-radius: 16px;
            border-bottom-left-radius: 16px;
            box-shadow: -4px 0 12px rgba(0,0,0,0.15);
            transition: right 0.4s cubic-bezier(0.4,0,0.2,1);
            z-index: 200;
        }
        .skill-info-card.active {
            right: 0;
        }
    }
    @media (max-width: 767px) {
        .skill-tree-wrapper {
            position: relative;
        }
        .skill-info-card {
            position: absolute;
            left: 0;
            bottom: 0;
            width: 100%;
            height: 45vh;
            transform: translateY(100%);
            border-top-left-radius: 16px;
            border-top-right-radius: 16px;
            box-shadow: 0 -6px 12px rgba(0, 0, 0, 0.3);
            z-index: 10;
            pointer-events: auto;
        }
        .skill-info-card.active {
            transform: translateY(0%);
        }
    }
    .close-skill-card {
        position: absolute;
        top: 0.6rem;
        right: 0.8rem;
        background: none;
        border: none;
        font-size: 1.5rem;
        color: #666;
        cursor: pointer;
        z-index: 10;
        transition: color 0.2s ease;
    }
    .close-skill-card:hover { color: #222; }
    @media (max-width: 767px) {
        .close-skill-card {
            top: 0.4rem;
            right: 1rem;
            font-size: 1.8rem;
        }
    }

    /* === Responsive Adjustments === */
    @media (min-width: 1024px) {
        .section { padding-left: 5vw; }
        .section.narrow .section-inner {
            flex-direction: row;
            align-items: center;
            justify-content: flex-start;
            height: 100%;
        }
        .section.narrow .section-content { max-width: 40%; }
        body::before { background-position: right center; }
    }
    @media (max-width: 768px) {
        .skill-tree-wrapper {
            height: calc(100vh - var(--header-height) - var(--footer-height));
        }

        .section {
            padding-top: var(--header-height);
            justify-content: flex-start;
            align-items: center;
            text-align: center;
            margin: 0;
        }
        .section-inner {
            flex-direction: column;
            align-items: center;
        }
        .section-content { max-width: 100%; }
        body::before { background-position: center bottom; }
        .header-social-icons { display: none; }
        .flip-controls-wrapper .flip-overlay-hint { display: none; }
    }