:root {
    --color-bg: #f5f5f7;
    --color-surface: #ffffff;
    --color-surface-soft: #fbfbfd;
    --color-text: #1d1d1f;
    --color-muted: #6e6e73;
    --color-accent: #0071e3;
    --color-accent-soft: #e8f1fb;
    --color-border: rgba(0, 0, 0, 0.08);
    --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 12px 40px rgba(0, 0, 0, 0.08);
    --radius: 28px;
    --container: 1180px;
    --transition: 260ms cubic-bezier(0.22, 1, 0.36, 1);
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.55;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

.container {
    width: min(var(--container), calc(100% - 2.5rem));
    margin-inline: auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.78);
    backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.logo {
    font-size: 1.05rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.site-nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-list a {
    color: var(--color-muted);
    font-size: 0.92rem;
    font-weight: 500;
    transition: color var(--transition);
}

.nav-list a:hover,
.nav-list a:focus-visible {
    color: var(--color-text);
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 40px;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background-color: var(--color-surface);
    cursor: pointer;
    padding: 0;
}

.menu-toggle span {
    display: block;
    width: 16px;
    height: 1.5px;
    margin: 4px auto;
    background-color: var(--color-text);
    border-radius: 999px;
    transition: transform var(--transition), opacity var(--transition);
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 1.35rem;
    border-radius: 999px;
    background-color: var(--color-accent);
    color: #ffffff;
    font-size: 0.95rem;
    font-weight: 500;
    box-shadow: 0 8px 24px rgba(0, 113, 227, 0.22);
    transition: transform var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.button:hover,
.button:focus-visible {
    transform: translateY(-1px);
    box-shadow: 0 12px 30px rgba(0, 113, 227, 0.28);
    background-color: #0077ed;
}

.button-secondary {
    background-color: rgba(255, 255, 255, 0.8);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    box-shadow: none;
}

.button-secondary:hover,
.button-secondary:focus-visible {
    background-color: #ffffff;
}

.button-small {
    min-height: 38px;
    padding: 0 1.1rem;
    font-size: 0.9rem;
}

.hero {
    padding: 7rem 0 5rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, 0.85fr);
    align-items: center;
    gap: 4rem;
}

.eyebrow {
    margin: 0 0 1rem;
    color: var(--color-accent);
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.02em;
}

.hero h1 {
    margin: 0 0 1.25rem;
    font-size: clamp(3.2rem, 7vw, 6.2rem);
    line-height: 0.98;
    letter-spacing: -0.045em;
    font-weight: 700;
}

.hero-text {
    max-width: 620px;
    color: var(--color-muted);
    font-size: 1.2rem;
    line-height: 1.6;
    margin-bottom: 2.25rem;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.profile-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 32px;
    padding: 2.25rem;
    box-shadow: var(--shadow-md);
    text-align: center;
}

.profile-avatar {
    width: 104px;
    height: 104px;
    margin: 0 auto 1.25rem;
    border-radius: 50%;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #0071e3, #4fa3ff);
    color: #ffffff;
    font-size: 2.1rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.profile-card h2 {
    margin: 0 0 0.35rem;
    font-size: 1.6rem;
    letter-spacing: -0.02em;
}

.profile-card p {
    margin: 0 0 1.5rem;
    color: var(--color-muted);
}

.profile-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.6rem;
}

.profile-tags span,
.tag {
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background-color: var(--color-accent-soft);
    color: var(--color-accent);
    font-size: 0.85rem;
    font-weight: 600;
}

.section {
    padding: 6rem 0;
}

.section-alt {
    background-color: var(--color-surface);
}

.section-heading {
    max-width: 760px;
    margin-bottom: 3rem;
}

.section-heading h2 {
    margin: 0;
    font-size: clamp(2.2rem, 4vw, 3.4rem);
    line-height: 1.05;
    letter-spacing: -0.035em;
    font-weight: 700;
}

.about-content {
    max-width: 780px;
}

.about-content p {
    color: var(--color-muted);
    font-size: 1.12rem;
    line-height: 1.7;
    margin-bottom: 1.35rem;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
}

.project-card {
    background-color: var(--color-surface-soft);
    border: 1px solid var(--color-border);
    border-radius: 30px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition);
}

.project-card:hover,
.project-card:focus-within {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
}

.project-media {
    height: 210px;
    display: grid;
    place-items: center;
    background: linear-gradient(135deg, #f0f4fa, #e2eaf6);
    color: var(--color-muted);
    font-size: 1.05rem;
    font-weight: 600;
    border-bottom: 1px solid var(--color-border);
}

.project-body {
    padding: 1.75rem;
}

.project-top {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.85rem;
}

.project-card h3 {
    margin: 0;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.project-card p {
    color: var(--color-muted);
    margin: 0 0 1.25rem;
    line-height: 1.65;
}

.project-status {
    flex-shrink: 0;
    padding: 0.38rem 0.75rem;
    border-radius: 999px;
    background-color: var(--color-accent-soft);
    color: var(--color-accent);
    font-size: 0.78rem;
    font-weight: 600;
}

.tag-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.project-link-note {
    margin-top: 1.25rem;
    font-size: 0.88rem;
    color: var(--color-muted);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
}

.tech-card {
    background-color: var(--color-surface-soft);
    border: 1px solid var(--color-border);
    border-radius: 24px;
    padding: 2rem 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.tech-card:hover,
.tech-card:focus-within {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: rgba(0, 113, 227, 0.22);
}

.tech-card h3 {
    margin: 0 0 0.45rem;
    font-size: 1.35rem;
    letter-spacing: -0.02em;
}

.tech-card p {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.95rem;
}

.tech-card-primary {
    background: linear-gradient(180deg, #ffffff, #f0f6ff);
    border-color: rgba(0, 113, 227, 0.24);
}

.tech-card-primary h3 {
    color: var(--color-accent);
}

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(300px, 460px);
    gap: 3rem;
    align-items: start;
}

.contact-grid h2 {
    margin: 0 0 1rem;
    font-size: clamp(2.2rem, 4vw, 3.4rem);
    line-height: 1.05;
    letter-spacing: -0.035em;
    font-weight: 700;
}

.contact-grid p {
    color: var(--color-muted);
    margin-bottom: 1.5rem;
    font-size: 1.08rem;
}

.contact-list {
    display: grid;
    gap: 0.85rem;
}

.contact-list p {
    margin: 0;
    color: var(--color-text);
}

.contact-form {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 30px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    display: grid;
    gap: 1rem;
}

.contact-form label {
    display: grid;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--color-text);
}

.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.95rem 1.1rem;
    border: 1px solid var(--color-border);
    border-radius: 16px;
    font: inherit;
    color: var(--color-text);
    background-color: var(--color-surface-soft);
    transition: border-color var(--transition), box-shadow var(--transition), background-color var(--transition);
}

.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    background-color: #ffffff;
    box-shadow: 0 0 0 4px rgba(0, 113, 227, 0.12);
}

.form-note {
    margin: 0;
    color: var(--color-muted);
    font-size: 0.9rem;
}

.form-status {
    min-height: 1.25rem;
    margin: 0;
    color: var(--color-accent);
    font-weight: 600;
}

[data-reveal] {
    opacity: 0;
    transform: translateY(28px);
    transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1), transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

.site-footer {
    padding: 2.5rem 0;
    border-top: 1px solid var(--color-border);
    color: var(--color-muted);
    text-align: center;
    font-size: 0.92rem;
}

@media (max-width: 980px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .profile-card {
        max-width: 360px;
    }

    .projects-grid,
    .tech-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .projects-grid,
    .tech-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 720px) {
    .menu-toggle {
        display: block;
    }

    .nav-list {
        position: absolute;
        top: 72px;
        left: 1.25rem;
        right: 1.25rem;
        flex-direction: column;
        align-items: stretch;
        gap: 0.25rem;
        padding: 0.75rem;
        border: 1px solid var(--color-border);
        border-radius: 20px;
        background-color: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(20px);
        box-shadow: var(--shadow-md);
        opacity: 0;
        pointer-events: none;
        transform: translateY(-8px);
        transition: opacity var(--transition), transform var(--transition);
    }

    .nav-list.is-open {
        opacity: 1;
        pointer-events: auto;
        transform: translateY(0);
    }

    .nav-list a {
        display: block;
        padding: 0.8rem 0.9rem;
        border-radius: 14px;
    }

    .header-inner {
        position: relative;
    }

    .button-small {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}