:root {
    /* ===== Color Palette ===== */
    --bg-gradient-start: #6178c2;
    --bg-gradient-end: #6fc5df;
    --surface-glass: #ffffff9e;
    --surface-border: rgba(255, 255, 255, 0.25);
    --surface-shadow: 0 14px 32px rgba(0, 0, 0, 0.08);
    --card-bg: #fdfdff;
    --card-border: #e6e9f5;
    --card-shadow: 0 6px 18px rgba(0, 0, 0, 0.04);

    /* Navigation */
    --nav-bg: #859ded;
    --nav-border: #e0e6ff;
    --nav-text: #131b2e;

    /* Typography */
    --text-main: #1f2a44;
    --text-body: #2e3a54;

    /* Tables */
    --table-bg: #f8f9ff;
    --table-head: #dfe8ff;
    --table-border: #e0e6ff;

    /* UI Elements */
    --divider: rgba(19, 27, 46, 0.08);
    --button-hover-bg: rgba(31, 42, 68, 0.08);
    --link-hover-text: #0f1a33;
    --link-color: #4267C2;
    --social-link-bg: rgba(255, 255, 255, 0.45);
    --social-link-hover-bg: #ffffff;
    --social-link-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
    --focus-outline: 2px solid #6178c2;
    --focus-offset: 2px;

    /* ===== Typography & Spacing ===== */
    --font-base: 1.45rem;
    --line-base: 1.5;

    /* Border Radius */
    --radius-lg: 25px;
    --radius-md: 16px;
    --radius-sm: 14px;

    /* Spacing */
    --space-page: 16px;
    --space-card: 32px;
    --gap-grid: 24px;
    --gap-inner: 16px;

    /* Transitions */
    --transition-fast: 120ms ease;
    --transition-medium: 140ms ease;
    --transition-slow: 240ms ease;
}


/* ===== Base Styles ===== */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    padding: 64px 128px;
    background: linear-gradient(45deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    font-family: "Inter", "Segoe UI", system-ui, -apple-system, sans-serif;
    font-weight: 400;
    font-style: normal;
    font-size: var(--font-base);
    line-height: var(--line-base);
    color: var(--text-body);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== Typography Classes ===== */
.momo-trust-display-regular {
    font-family: "Momo Trust Display", sans-serif;
    font-weight: 400;
    font-style: normal;
}

.amatic-sc-regular {
    font-family: "Amatic SC", sans-serif;
    font-weight: 400;
    font-style: normal;
}

.amatic-sc-bold {
    font-family: "Amatic SC", sans-serif;
    font-weight: 700;
    font-style: normal;
}

/* ===== Layout Components ===== */
.container {
    width: 100%;
    max-width: 100%;
    background-color: var(--surface-glass);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-lg);
    padding: 48px 64px var(--space-card);
    box-shadow: var(--surface-shadow);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: var(--gap-grid);
    align-items: stretch;
    position: relative;
}

.layout::before {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: calc(240px + var(--gap-grid) / 2);
    width: 1px;
    background: var(--divider);
}

.sidebar,
.main {
    background: transparent;
    border-radius: var(--radius-md);
    padding: var(--gap-inner);
}

.sidebar {
    text-align: center;
    display: flex;
    flex-direction: column;
    height: fit-content;
    position: sticky;
    top: 16px;
}

.avatar {
    width: 100%;
    max-width: 100%;
    aspect-ratio: 1 / 1;
    border-radius: 50%;
    object-fit: cover;
    display: block;
    margin: 0 0 16px 0;
    border: 2px solid var(--card-border);
}

.nav {
    list-style: none;
    padding: 0;
    margin: 0;
    display: grid;
    gap: 8px;
}

.nav-divider {
    height: 1px;
    background: var(--divider);
    margin: 4px 0;
    border-radius: 999px;
    list-style: none;
}

.nav a {
    display: block;
    padding: 6px 0;
    color: var(--nav-text);
    text-decoration: none;
    transition: color var(--transition-fast);
    border-radius: 4px;
}

.nav a:hover {
    color: var(--link-hover-text);
}

.nav a:focus-visible {
    color: var(--link-hover-text);
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
}

.sidebar-divider {
    height: 1px;
    background: var(--divider);
    margin: 16px 0;
    border-radius: 999px;
}

.sidebar-info {
    list-style: none;
    padding: 0;
    margin: 0;
    text-align: left;
    font-size: 0.9rem;
    line-height: 1.5;
}

.sidebar-info li {
    margin-bottom: 12px;
    color: var(--text-body);
}

.sidebar-info strong {
    color: var(--text-main);
    font-weight: 600;
    display: block;
    margin-bottom: 2px;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.sidebar-info a {
    color: var(--link-color);
    text-decoration: none;
    word-break: break-all;
    transition: color var(--transition-fast);
}

.sidebar-info a:hover {
    color: var(--link-hover-text);
    text-decoration: underline;
}

.sidebar-info a:focus-visible {
    color: var(--link-hover-text);
    text-decoration: underline;
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
    border-radius: 2px;
}

.sidebar-social {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: auto;
    padding-top: 16px;
}

.sidebar-social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 12px 16px;
    color: var(--nav-text);
    background: rgba(255, 255, 255, 0.3);
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    font-size: 16px;
    font-weight: 500;
    text-decoration: none;
    transition: transform var(--transition-medium),
        background-color var(--transition-medium),
        box-shadow var(--transition-medium);
    will-change: transform;
}

.sidebar-social-link i {
    font-size: 18px;
}

.sidebar-social-link:hover {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.5);
    box-shadow: var(--card-shadow);
}

.sidebar-social-link:focus-visible {
    transform: translateY(-2px);
    background: rgba(255, 255, 255, 0.5);
    box-shadow: var(--card-shadow);
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
}

/* ===== Main Content Typography ===== */
.main h1 {
    margin: 0 0 12px;
    color: var(--text-main);
    font-family: "Lato", sans-serif;
    font-weight: 700;
}

.main h2,
.main h3 {
    color: var(--text-main);
    font-family: "Lato", sans-serif;
    font-weight: 700;
    margin-top: 1.5em;
}

.main p {
    margin: 0 0 12px;
    color: var(--text-body);
    line-height: 1.6;
}

/* ===== Cards ===== */
.card {
    background: transparent;
    border: 0;
    border-radius: var(--radius-sm);
    padding: var(--gap-inner);
    box-shadow: none;
}

/* ===== About Section ===== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    align-items: start;
}

.about-grid table {
    width: 100%;
    border-collapse: collapse;
    border-spacing: 0;
    background: transparent;
    border: 0;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 16px;
}

.about-grid th,
.about-grid td {
    padding: 10px 12px;
    text-align: left;
    color: var(--text-main);
    border-bottom: 1px solid var(--table-border);
    position: relative;
}

.about-grid th {
    background: transparent;
    border-top: 1px solid var(--table-border);
}

.about-grid tr:last-child td {
    border-bottom: 1px solid var(--table-border);
}

.main ul {
    margin: 0 0 0 18px;
    padding: 0;
    color: var(--text-body);
    list-style: "✦ ";
}

.main ul li {
    margin-bottom: 0.5em;
}

/* ===== Media Queries ===== */
@media (max-width: 1200px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
}

@media (max-width: 1024px) {
    body {
        padding: 48px 24px;
    }

    .container {
        padding-top: 32px;
        padding-bottom: var(--space-card);
        padding-left: 24px;
        padding-right: 24px;
    }

    .layout {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .layout::before {
        content: none;
    }

    .sidebar {
        padding: 0;
        display: flex;
        flex-direction: row;
        align-items: flex-start;
        gap: 24px;
        margin-bottom: 8px;
        text-align: left;
        flex-wrap: wrap;
        position: static;
        height: auto;
        top: auto;
    }

    .sidebar-divider {
        display: none;
    }

    .sidebar-info {
        width: 100%;
        display: grid;
        grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
        gap: 12px;
        font-size: 0.85rem;
        order: 3;
    }

    .sidebar-info li {
        margin-bottom: 8px;
    }

    .sidebar-info strong {
        font-size: 0.75rem;
    }

    .sidebar-social {
        margin-top: 0;
        gap: 8px;
        padding-top: 0;
    }

    .sidebar-social-link {
        width: auto;
        padding: 8px 12px;
    }

    .sidebar-social-link i {
        font-size: 16px;
    }

    .avatar {
        width: 120px;
        height: 120px;
        margin: 0;
        flex-shrink: 0;
        order: 1;
    }

    .nav {
        display: flex;
        flex-direction: row;
        gap: 16px;
        justify-content: flex-start;
        flex-wrap: wrap;
        min-width: 0;
        order: 2;
    }

    .nav a {
        padding: 4px 0;
        font-size: 0.95rem;
    }

    .sidebar-social {
        margin-top: 0;
        gap: 8px;
    }

    .sidebar-social-link {
        width: 32px;
        height: 32px;
        font-size: 16px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .about-grid table {
        font-size: 0.95rem;
        overflow-x: auto;
        display: block;
    }

    .main h2 {
        font-size: 1.4rem;
        margin: 10px 0 5px 0;
    }

    .main h3 {
        font-size: 1.2rem;
    }

    .social-links {
        grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
        gap: 12px;
    }

    .social-link {
        font-size: 0.95rem;
        padding: 10px 14px;
    }

    .social-button {
        width: 60px;
        height: 60px;
    }

    .social-icon {
        width: 60px;
        height: 60px;
        font-size: 30px;
    }
}

@media (max-width: 900px) {
    body {
        padding: 48px 32px;
    }

    .container {
        padding-top: 32px;
        padding-bottom: var(--space-card);
        padding-left: 32px;
        padding-right: 32px;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .about-grid table {
        overflow-x: auto;
        display: block;
    }
}

@media (max-width: 720px) {
    body {
        padding: 70px 16px 16px;
        font-size: 1.2rem;
    }

    .container {
        padding-top: 24px;
        padding-bottom: 16px;
        padding-left: 16px;
        padding-right: 16px;
        border-radius: var(--radius-md);
    }

    .layout {
        grid-template-columns: 1fr;
        position: static;
        gap: 16px;
    }

    .layout::before {
        content: none;
    }

    .sidebar,
    .main {
        padding: 8px;
    }

    .sidebar {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 12px;
        margin-bottom: 8px;
        height: auto;
        position: static;
        top: auto;
    }

    .sidebar-divider {
        display: block;
        width: 100%;
        margin: 8px 0;
    }

    .sidebar-info {
        width: 100%;
        font-size: 0.8rem;
        text-align: center;
    }

    .sidebar-info li {
        margin-bottom: 10px;
    }

    .sidebar-info strong {
        font-size: 0.72rem;
    }

    .sidebar-social {
        margin-top: 8px;
        gap: 8px;
        padding-top: 0;
        width: 100%;
        flex-direction: row;
    }

    .sidebar-social-link {
        width: auto;
        padding: 8px 12px;
        font-size: 14px;
    }

    .sidebar-social-link i {
        font-size: 14px;
    }

    .avatar {
        width: 80px;
        height: 80px;
        margin: 0;
    }

    .nav {
        display: flex;
        flex-direction: row;
        gap: 12px;
        justify-content: center;
        flex-wrap: wrap;
        width: 100%;
    }

    .nav a {
        padding: 4px 8px;
        font-size: 0.9rem;
    }

    .nav-divider {
        display: none;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .about-grid table {
        font-size: 0.9rem;
    }

    .about-grid th,
    .about-grid td {
        padding: 8px;
    }

    .about-grid th {
        font-size: 0.85rem;
    }

    .main h1 {
        font-size: 1.8rem;
        margin-bottom: 8px;
    }

    .main h2 {
        font-size: 1.5rem;
        margin: 12px 0 6px 0;
    }

    .main h3 {
        font-size: 1.3rem;
        margin: 10px 0 4px 0;
    }

    .main p {
        font-size: 0.95rem;
        margin: 0 0 8px 0;
    }

    .main ul {
        margin: 0 0 8px 16px;
        font-size: 0.95rem;
    }

    .social-grid {
        gap: 12px;
        justify-content: center;
    }

    .social-button {
        width: 56px;
        height: 56px;
    }

    .social-icon {
        width: 56px;
        height: 56px;
        font-size: 28px;
    }

    .social-links {
        grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
        gap: 10px;
    }

    .social-link {
        padding: 10px 12px;
        font-size: 0.9rem;
    }

    .social-link i {
        font-size: 1em;
    }

    .project-card header {
        flex-direction: column;
        align-items: flex-start;
        gap: 4px;
    }

    .project-platform {
        font-size: 0.9rem;
    }

    .project-description {
        font-size: 0.9rem;
    }

    .project-badge {
        font-size: 0.65rem;
        padding: 2px 6px;
        margin-bottom: 6px;
    }

    .theme-toggle {
        width: 40px;
        height: 40px;
        font-size: 18px;
        top: 12px;
        right: 12px;
    }

    .social-card {
        margin-top: 4px;
    }
}

@media (max-width: 480px) {
    body {
        padding: 60px 12px 12px;
        font-size: 1.1rem;
    }

    .container {
        padding: 16px 12px;
    }

    .avatar {
        width: 70px;
        height: 70px;
    }

    .nav a {
        padding: 4px 6px;
        font-size: 0.85rem;
    }

    .sidebar-social {
        gap: 8px;
        width: 100%;
        flex-direction: row;
    }

    .sidebar-social-link {
        width: auto;
        padding: 8px 12px;
        font-size: 13px;
    }

    .sidebar-social-link i {
        font-size: 14px;
    }

    .sidebar-info {
        font-size: 0.75rem;
    }

    .sidebar-info strong {
        font-size: 0.7rem;
    }

    .main h1 {
        font-size: 1.6rem;
    }

    .main h2 {
        font-size: 1.3rem;
    }

    .main h3 {
        font-size: 1.1rem;
    }

    .social-links {
        grid-template-columns: 1fr;
    }

    .social-link {
        padding: 8px 10px;
        font-size: 0.85rem;
    }

    .about-grid table {
        font-size: 0.8rem;
    }

    .about-grid th,
    .about-grid td {
        padding: 6px;
    }

    .project-card header {
        gap: 0;
    }

    .project-badge {
        font-size: 0.6rem;
        padding: 2px 5px;
        margin-bottom: 4px;
    }
}

/* ===== Social Links ===== */
.social-card {
    margin-top: 8px;
    text-align: center;
}

.contact-cta {
    display: grid;
    gap: 6px;
    margin-bottom: 16px;
    color: var(--text-main);
}

.contact-cta strong {
    font-size: 1.15em;
    color: var(--nav-text);
    font-weight: 400;
}

.social-grid {
    display: flex;
    gap: 18px;
    padding: 0 0 8px;
    list-style: none;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    width: 100%;
}

.social-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    background: transparent;
    border: none;
    padding: 0;
    color: var(--text-main);
    text-decoration: none;
    transition: transform var(--transition-medium),
        color var(--transition-medium),
        background-color var(--transition-medium);
    position: relative;
    cursor: pointer;
    border-radius: 12px;
    will-change: transform;
}

.social-button:hover {
    transform: translateY(-2px) scale(1.02);
    background: var(--button-hover-bg);
}

.social-button:focus-visible {
    transform: translateY(-2px) scale(1.02);
    background: var(--button-hover-bg);
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
}

.social-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 64px;
    height: 64px;
    line-height: 0;
    font-size: 32px;
}

.social-icon svg {
    width: 28px;
    height: 28px;
    display: block;
    fill: currentColor;
}

.social-meta {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.social-section {
    margin-top: 8px;
}

.social-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    padding: 0;
    margin: 8px 0 0;
}

.social-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 18px;
    background: var(--social-link-bg);
    color: var(--text-main);
    text-decoration: none;
    border: 1px solid var(--surface-border);
    border-radius: 12px;
    cursor: pointer;
    transition: transform var(--transition-fast),
        box-shadow var(--transition-fast),
        background-color var(--transition-fast);
    width: 100%;
    justify-content: center;
    text-align: center;
    font-size: 1.05rem;
    font-weight: 600;
    will-change: transform;
}

.social-link:hover {
    transform: translateY(-1px);
    box-shadow: var(--social-link-shadow);
    background: var(--social-link-hover-bg);
}

.social-link:focus-visible {
    transform: translateY(-1px);
    box-shadow: var(--social-link-shadow);
    background: var(--social-link-hover-bg);
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
}

.social-link i {
    font-size: 1.2em;
}

/* ===== Projects ===== */
.projects-grid {
    display: grid;
    gap: 16px;
    margin-top: 16px;
}

.project-card {
    padding: 0;
}

.project-card+.project-card {
    border-top: 1px solid var(--divider);
    padding-top: var(--gap-inner);
}

.project-card header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 6px;
}

.project-card h3 {
    margin: 0;
    color: var(--text-main);
}

.project-platform {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-body);
}

.project-description {
    margin: 0 0 8px 0;
    color: var(--text-body);
}

.project-links {
    display: inline-flex;
    gap: 12px;
}

.project-links a {
    color: var(--text-main);
    text-decoration: underline;
    transition: color var(--transition-fast);
}

.project-links a:hover {
    color: var(--link-hover-text);
}

.project-links a:focus-visible {
    color: var(--link-hover-text);
    outline: var(--focus-outline);
    outline-offset: var(--focus-offset);
    border-radius: 2px;
}

.project-badge {
    display: inline-block;
    padding: 3px 8px;
    margin: 0 0 8px 0;
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-body);
    background: transparent;
    border: 1px solid var(--divider);
    border-radius: 4px;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    opacity: 0.8;
}