* {
    box-sizing: border-box;
}

:root {
    color-scheme: light dark;
    --page-text: #202124;
    --muted-text: #5f6368;
    --footer-text: #6b7280;
    --page-background: linear-gradient(180deg, #fffdf8 0%, #f4f7fb 100%);
    --image-shadow: rgba(0, 0, 0, 0.15);
}

:root[data-theme="light"] {
    color-scheme: light;
}

:root[data-theme="dark"] {
    color-scheme: dark;
    --page-text: #f1f3f4;
    --muted-text: #bdc1c6;
    --footer-text: #9aa0a6;
    --page-background: linear-gradient(180deg, #202124 0%, #111315 100%);
    --image-shadow: rgba(0, 0, 0, 0.45);
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 50px 20px 0;
    color: var(--page-text);
    background: var(--page-background);
    font-family: Arial, sans-serif;
    transition: color 180ms ease, background 180ms ease;
}

.theme-toggle {
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 2;
    display: grid;
    width: 42px;
    height: 42px;
    padding: 0;
    place-items: center;
    border: 1px solid color-mix(in srgb, var(--page-text) 22%, transparent);
    border-radius: 50%;
    color: var(--page-text);
    background: color-mix(in srgb, var(--page-text) 8%, transparent);
    cursor: pointer;
    font-size: 1.25rem;
    transition: transform 180ms ease, background 180ms ease;
}

.theme-toggle:hover {
    transform: rotate(12deg) scale(1.06);
}

.theme-toggle:focus-visible {
    outline: 3px solid #1f6feb;
    outline-offset: 3px;
}

.title-row,
.social-links,
.cat-image,
footer {
    position: relative;
    z-index: 1;
}

.title-row {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 14px;
    max-width: 90vw;
}

.title-decoration {
    width: 38px;
    height: 38px;
    object-fit: contain;
    flex: 0 0 auto;
}

.title-decoration-left {
    width: 30px;
    height: 30px;
    position: relative;
    left: -8px;
    top: 8px;
    animation: little-bounce-left 1.8s ease-in-out infinite;
}

.title-decoration-right {
    width: 30px;
    height: 30px;
    position: relative;
    right: -8px;
    top: -4px;
    animation: little-bounce-right 1.8s ease-in-out 0.15s infinite;
}

@keyframes little-bounce-left {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    40% { transform: translateY(-8px) rotate(-5deg); }
    70% { transform: translateY(0) rotate(0deg); }
}

@keyframes little-bounce-right {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    40% { transform: translateY(-8px) rotate(5deg); }
    70% { transform: translateY(0) rotate(0deg); }
}

h1 {
    margin: 0;
    font-size: clamp(2rem, 5vw, 3.2rem);
    line-height: 1.1;
    text-align: center;
}

.subtitle {
    margin: 14px 0 0;
    color: var(--muted-text);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1.5;
    text-align: center;
}

.section-divider {
    width: min(100%, 620px);
    margin: 28px auto;
    border: 0;
    border-top: 1px solid color-mix(in srgb, var(--page-text) 15%, transparent);
}

.profile-intro {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: min(100%, 760px);
    margin: 30px auto 0;
    padding: 18px 20px 8px;
    text-align: center;
}

.section-divider + .profile-intro {
    margin-top: 1px;
}

.profile-kicker,
.section-kicker {
    margin: 0 0 10px;
    color: var(--accent);
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.profile-intro h2 {
    margin: 0;
    color: var(--text-primary);
    font-size: clamp(1.7rem, 4vw, 2.45rem);
    line-height: 1.12;
}

.profile-description,
.profile-goal {
    max-width: 660px;
    margin-right: auto;
    margin-left: auto;
    color: var(--text-secondary);
    font-size: 0.98rem;
    line-height: 1.6;
}

.profile-description {
    margin-top: 18px;
    margin-bottom: 8px;
}

.profile-goal {
    margin: 0;
}

.contact-details {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
    margin-top: 22px;
    justify-content: center;
    color: var(--text-secondary);
    font-size: 0.86rem;
    font-style: normal;
}

.contact-details span,
.contact-details a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.contact-details span::before,
.contact-details a::before {
    color: var(--accent);
}

.contact-details span::before { content: "⌖"; }
.contact-details a[href^="tel"]::before { content: "⌕"; }
.contact-details a[href^="mailto"]::before { content: "@"; }

.contact-details a {
    color: var(--text-primary);
    text-decoration: none;
}

.contact-details a:hover {
    color: var(--accent);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.cat-image {
    display: block;
    width: min(70vw, 620px);
    max-width: 100%;
    height: auto;
    margin-top: 42px;
    border-radius: 10px;
    box-shadow: 0 4px 16px var(--image-shadow);
    cursor: pointer;
}

.game-link {
    display: block;
    margin-top: 14px;
    color: inherit;
    font-size: 1.8rem;
    line-height: 1;
    text-decoration: none;
    transition: transform 180ms ease;
}

.resume-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    min-width: 260px;
    margin: 12px auto 0;
    padding: 0.8rem 1.6rem;
    border: 0;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease, gap 0.2s ease, transform 180ms ease;
}

.resume-button:hover,
.resume-button:focus-visible {
    color: #fff;
    background: var(--accent);
    transform: translateY(-3px);
}

.resume-button:hover span:last-child {
    transform: translateX(4px);
}

.resume-button span:last-child {
    display: inline-block;
    transition: transform 0.2s ease;
}

.resume-button:focus-visible {
    outline: 3px solid #1f6feb;
    outline-offset: 4px;
}

.game-link:hover,
.game-link:focus-visible {
    transform: scale(1.12);
}

.game-link:hover {
    animation: game-link-shake 320ms ease-in-out;
}

@keyframes game-link-shake {
    0%, 100% { transform: scale(1.12) rotate(0deg); }
    25% { transform: scale(1.12) rotate(-8deg); }
    75% { transform: scale(1.12) rotate(8deg); }
}

.game-link:focus-visible {
    outline: 3px solid #1f6feb;
    outline-offset: 4px;
}

footer {
    margin-top: 48px;
    margin-bottom: 30px;
    text-align: center;
}

footer p {
    margin: 10px 0 0;
    color: var(--footer-text);
    font-size: 0.9rem;
}

footer a {
    display: inline-block;
    color: var(--footer-text);
}

.back-link,
.legal-content a {
    color: var(--page-text);
}

.legal-page {
    align-items: stretch;
    padding-bottom: 50px;
}

.legal-content {
    width: min(100%, 720px);
    margin: 0 auto;
    padding: 28px 32px;
}

.legal-content h1 {
    margin: 28px 0 36px;
}

.legal-content h2 {
    margin: 28px 0 8px;
    font-size: 1.2rem;
}

.legal-content p {
    margin: 8px 0;
    color: var(--muted-text);
    line-height: 1.6;
}

.legal-note {
    margin-top: 36px !important;
    font-size: 0.9rem;
}

.site-logo {
    width: 120px;
    height: auto;
}

.social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    margin-top: 18px;
    margin-bottom: 24px;
}

.social-links img {
    display: block;
    width: auto;
    height: 55px;
    max-width: 42vw;
}

.social-links a {
    display: block;
    transition: transform 180ms ease, filter 180ms ease;
}

.social-links a:hover {
    transform: translateY(-4px) scale(1.04);
    filter: drop-shadow(0 5px 5px rgba(0,0,0,0.18));
}

.social-links a:focus-visible {
    outline: 3px solid #1f6feb;
    outline-offset: 4px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --page-text: #f1f3f4;
        --muted-text: #bdc1c6;
        --footer-text: #9aa0a6;
        --page-background: linear-gradient(180deg, #202124 0%, #111315 100%);
        --image-shadow: rgba(0, 0, 0, 0.45);
    }
}

@media (prefers-reduced-motion: reduce) {
    .theme-toggle {
        transition: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .social-links a,
    .title-decoration,
    .game-link {
        transition: none;
        animation: none;
    }
}

@media (max-width: 480px) {
    body {
        padding: 32px 16px 0;
    }

    .title-row {
        gap: 6px;
    }

    .title-decoration {
        width: 28px;
        height: 28px;
    }

    .title-decoration-left {
        left: -4px;
        top: 6px;
    }

    .title-decoration-right {
        right: -4px;
        top: -3px;
    }

    h1 {
        font-size: 1.8rem;
    }

    .subtitle {
        max-width: 290px;
        margin-top: 12px;
        font-size: 0.95rem;
    }

    .section-divider {
        width: calc(100% - 24px);
        margin: 22px auto;
    }

    .profile-intro {
        margin-top: 28px;
        padding: 14px 8px 4px;
    }

    .section-divider + .profile-intro {
        margin-top: 6px;
    }

    .profile-intro h2 {
        font-size: 1.7rem;
    }

    .contact-details {
        flex-direction: column;
        gap: 9px;
    }

    .social-links {
        width: 100%;
        gap: 10px;
        margin-top: 16px;
        margin-bottom: 20px;
    }

    .social-links img {
        height: 42px;
        max-width: calc(50vw - 13px);
    }

    .cat-image {
        width: 90vw;
        margin-top: 22px;
    }

    .resume-button {
        width: min(100%, 290px);
    }

    footer {
        margin-top: 36px;
    }

    .legal-page {
        padding: 20px 16px 32px;
    }

    .legal-content {
        padding: 22px 20px;
    }

    .legal-content h1 {
        margin: 24px 0 30px;
        font-size: 2rem;
    }
}

:root {
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: rgba(0, 0, 0, 0.08);
    --card-shadow: rgba(0, 0, 0, 0.08);
    --text-primary: #1a1a2e;
    --text-secondary: #555;
    --accent: #2563eb;
    --accent-soft: rgba(37, 99, 235, 0.12);
    --tag-lang-bg: #dbeafe;
    --tag-lang-fg: #1d4ed8;
    --tag-tool-bg: #dcfce7;
    --tag-tool-fg: #15803d;
    --tag-kernel-bg: #ffedd5;
    --tag-kernel-fg: #c2410c;
    --tag-distributed-bg: #cffafe;
    --tag-distributed-fg: #0e7490;
    --tag-algo-bg: #fef9c3;
    --tag-algo-fg: #a16207;
    --tag-robotics-bg: #ffe4e6;
    --tag-robotics-fg: #be123c;
}

[data-theme="dark"] {
    --card-bg: rgba(30, 30, 45, 0.85);
    --card-border: rgba(255, 255, 255, 0.1);
    --card-shadow: rgba(0, 0, 0, 0.4);
    --text-primary: #eee;
    --text-secondary: #aaa;
    --accent-soft: rgba(37, 99, 235, 0.25);
    --tag-lang-bg: #1e3a8a;
    --tag-lang-fg: #c7d2fe;
    --tag-tool-bg: #14532d;
    --tag-tool-fg: #bbf7d0;
    --tag-kernel-bg: #7c2d12;
    --tag-kernel-fg: #fed7aa;
    --tag-distributed-bg: #164e63;
    --tag-distributed-fg: #a5f3fc;
    --tag-algo-bg: #713f12;
    --tag-algo-fg: #fef08a;
    --tag-robotics-bg: #881337;
    --tag-robotics-fg: #fecdd3;
}

.portfolio {
    max-width: 900px;
    margin: 4rem auto;
    padding: 0 1.5rem;
}

.portfolio h2 {
    text-align: center;
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
}

.portfolio .section-kicker {
    margin-bottom: 8px;
    text-align: center;
}

.portfolio-intro {
    margin: 0 auto;
    color: var(--text-secondary);
    text-align: center;
}

.portfolio h2::after {
    content: "";
    display: block;
    width: 64px;
    height: 4px;
    margin: 0.75rem auto 0;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--accent), transparent);
}

.project-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.project {
    position: relative;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: 0 2px 8px var(--card-shadow);
    backdrop-filter: blur(8px);
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.project:hover {
    transform: translateY(-6px);
    box-shadow: 0 12px 24px var(--card-shadow);
}

.project::before {
    content: "";
    position: absolute;
    inset: 0;
    border-radius: 16px;
    padding: 1px;
    background: linear-gradient(135deg, var(--accent), transparent 40%);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.25s ease;
    pointer-events: none;
}

.project:hover::before {
    opacity: 1;
}

.project-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--accent-soft);
    font-size: 1.4rem;
    margin-bottom: 0.75rem;
}

.project h3 {
    margin: 0 0 0.5rem;
    font-size: 1.05rem;
    color: var(--text-primary);
}

.project p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
    margin: 0.5rem 0 0.75rem;
}

.tag {
    font-size: 0.72rem;
    font-weight: 600;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    white-space: nowrap;
}

.tag-lang     { background: var(--tag-lang-bg); color: var(--tag-lang-fg); }
.tag-tool     { background: var(--tag-tool-bg); color: var(--tag-tool-fg); }
.tag-kernel     { background: var(--tag-kernel-bg); color: var(--tag-kernel-fg); }
.tag-distributed { background: var(--tag-distributed-bg); color: var(--tag-distributed-fg); }
.tag-algo       { background: var(--tag-algo-bg); color: var(--tag-algo-fg); }
.tag-robotics    { background: var(--tag-robotics-bg); color: var(--tag-robotics-fg); }

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin-top: 1rem;
    padding: 0.45rem 1rem;
    border-radius: 999px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none;
    transition: background 0.2s ease, color 0.2s ease, gap 0.2s ease;
}

.project-link:hover {
    background: var(--accent);
    color: #fff;
}

.project-link:hover .project-link-icon {
    transform: translateX(4px);
}

.project-link-icon {
    display: inline-block;
    transition: transform 0.2s ease;
}