*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: calc(var(--header-height) + 1rem);
}

body {
    min-width: 0;
    margin: 0;
    color: var(--color-text);
    background: var(--color-background);
    font-family: var(--font-family-base);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}

img {
    display: block;
    max-width: 100%;
}

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

button {
    color: inherit;
    font: inherit;
}

button,
a {
    -webkit-tap-highlight-color: transparent;
}

:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

.container {
    width: min(100% - 2rem, var(--container-max-width));
    margin-inline: auto;
}

.skip-link {
    position: fixed;
    top: 0.75rem;
    left: 0.75rem;
    z-index: 999;
    padding: 0.75rem 1rem;
    transform: translateY(-160%);
    border-radius: var(--radius-md);
    color: var(--color-white);
    background: var(--color-primary);
}

.skip-link:focus {
    transform: translateY(0);
}

.section {
    padding-block: var(--section-space);
}

main > .section:nth-of-type(even) {
    background: var(--color-surface);
}

.section-heading {
    max-width: 720px;
    margin: 0 auto 2.5rem;
    text-align: center;
}

.section-label {
    margin: 0 0 0.5rem;
    color: var(--color-primary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.section-title {
    margin: 0 0 0.75rem;
    color: var(--color-text);
    font-size: clamp(2.125rem, 4vw, 3rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.035em;
    line-height: var(--line-height-tight);
}

.section-description {
    max-width: 680px;
    margin: 0 auto;
    color: var(--color-text-muted);
    line-height: var(--line-height-relaxed);
}

/* Header and navigation */

.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-header);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-white);
}

.nav-container {
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
}

.site-logo {
    flex-shrink: 0;
    color: var(--color-text);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.025em;
}

.site-nav {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1.875rem;
    margin-left: auto;
}

.nav-link {
    position: relative;
    padding-block: 0.5rem;
    color: var(--color-text-secondary);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    transition:
        color var(--transition-fast),
        background-color var(--transition-fast);
}

.nav-link::after {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 2px;
    transform: scaleX(0);
    transform-origin: left;
    background: var(--color-primary);
    content: "";
    transition: transform var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible,
.nav-link[aria-current="page"] {
    color: var(--color-primary);
}

.nav-link:hover::after,
.nav-link:focus-visible::after,
.nav-link[aria-current="page"]::after {
    transform: scaleX(1);
}

.nav-link:focus-visible,
.btn:focus-visible,
.contact-item:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

.menu-toggle {
    display: none;
    width: 44px;
    height: 44px;
    flex: 0 0 auto;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 5px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-white);
    cursor: pointer;
}

.menu-toggle span {
    width: 20px;
    height: 2px;
    border-radius: var(--radius-full);
    background: var(--color-text);
    transition:
        transform var(--transition-fast),
        opacity var(--transition-fast);
}

.menu-toggle.is-open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.is-open span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.is-open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Hero */

.hero {
    padding-block: clamp(3rem, 4.2vw, 3.5rem);
    background: var(--color-background);
}

.hero-container {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
    gap: clamp(2rem, 4vw, 3.5rem);
}

.hero-content {
    min-width: 0;
    max-width: 680px;
}

.hero-greeting {
    margin: 0 0 0.5rem;
    color: var(--color-primary);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
}

.hero-title {
    margin: 0 0 1rem;
    color: var(--color-text);
    font-size: clamp(3.5rem, 5vw, 4rem);
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.035em;
    line-height: 1.05;
    overflow-wrap: anywhere;
}

.hero-role {
    margin: 0 0 0.75rem;
    color: var(--color-primary-dark);
    font-size: clamp(1.625rem, 2.5vw, 1.875rem);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

.hero-role span {
    padding-inline: 0.2rem;
    color: var(--color-text-muted);
    font-weight: var(--font-weight-regular);
}

.hero-specialties {
    margin: 0 0 1.25rem;
    color: var(--color-text-secondary);
    font-size: 1.0625rem;
    font-weight: var(--font-weight-medium);
}

.hero-description {
    max-width: 600px;
    margin: 0 0 1.75rem;
    color: var(--color-text-muted);
    font-size: var(--font-size-base);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.75rem;
}

.hero-image {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 0;
}

.hero-image img {
    position: relative;
    width: min(100%, 300px);
    height: auto;
    aspect-ratio: 1;
    border: 4px solid var(--color-white);
    border-radius: 50%;
    box-shadow: var(--shadow-md);
    object-fit: cover;
    transition:
        transform var(--transition-normal),
        box-shadow var(--transition-normal);
}

.hero-image img:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 26px rgba(20, 36, 58, 0.12);
}

/* Buttons */

.btn {
    display: inline-flex;
    min-height: 48px;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.2rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition:
        background-color var(--transition-fast),
        border-color var(--transition-fast),
        color var(--transition-fast),
        box-shadow var(--transition-fast),
        transform var(--transition-fast);
}

.btn:hover {
    transform: translateY(-1px);
}

.btn-primary {
    color: var(--color-white);
    background: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    box-shadow: var(--shadow-sm);
}

.btn-secondary {
    border-color: var(--color-border);
    color: var(--color-text);
    background: var(--color-white);
}

.btn-secondary:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
}

/* About */

.about-content {
    max-width: 860px;
    margin-inline: auto;
}

.about-text {
    display: grid;
    gap: 1rem;
}

.about-text p {
    margin: 0;
    color: var(--color-text-secondary);
    line-height: var(--line-height-relaxed);
}

/* Experience */

.experience-list {
    display: grid;
    gap: 1.25rem;
}

.experience-card,
.project-card,
.skill-card,
.education-card {
    min-width: 0;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface-raised);
    box-shadow: var(--shadow-sm);
    transition:
        transform var(--transition-normal),
        box-shadow var(--transition-normal),
        border-color var(--transition-normal);
}

.experience-card {
    padding: clamp(1.25rem, 3vw, 2rem);
}

.experience-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.experience-header h3,
.project-card h3,
.skill-card h3,
.education-card h3 {
    margin: 0 0 0.5rem;
    color: var(--color-text);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    letter-spacing: -0.025em;
    line-height: var(--line-height-tight);
    overflow-wrap: anywhere;
}

.experience-company {
    margin: 0;
    color: var(--color-primary-dark);
    font-weight: var(--font-weight-semibold);
}

.experience-date {
    flex: 0 0 auto;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    text-align: right;
}

.experience-details {
    display: grid;
    gap: 0.55rem;
    margin: 0;
    padding-left: 1.25rem;
    color: var(--color-text-secondary);
}

.experience-details li {
    padding-left: 0.15rem;
}

.experience-details li::marker {
    color: var(--color-primary);
}

/* Projects */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
}

.project-card {
    display: flex;
    flex-direction: column;
    padding: 1.875rem;
}

.project-card h3 {
    font-size: 1.5625rem;
}

.project-card:hover,
.experience-card:hover,
.skill-card:hover,
.education-card:hover {
    transform: translateY(-2px);
    border-color: var(--color-border-strong);
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.08);
}

.project-type {
    margin: 0 0 0.75rem;
    color: var(--color-primary-dark);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.project-role {
    margin: 0 0 0.75rem;
    color: var(--color-text-secondary);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
}

.project-description {
    margin: 0;
    color: var(--color-text-muted);
    font-size: 1rem;
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.875rem;
}

.project-tech span {
    padding: 0.3rem 0.65rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    background: var(--color-surface);
    font-size: 0.875rem;
}

/* Skills */

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

.skill-card {
    padding: 1.5rem;
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin: 0;
    padding: 0;
    list-style: none;
}

.skill-list li {
    max-width: 100%;
    padding: 0.35rem 0.6rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    color: var(--color-text-secondary);
    background: var(--color-surface);
    font-size: var(--font-size-sm);
    overflow-wrap: anywhere;
}

/* Education */

.education-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.25rem;
}

.education-card {
    padding: clamp(1.25rem, 3vw, 2rem);
}

.education-degree {
    margin: 0 0 0.5rem;
    color: var(--color-primary-dark);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.education-institution {
    margin: 0 0 0.35rem;
    color: var(--color-text-secondary);
    font-weight: var(--font-weight-medium);
}

.education-meta {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.education-thesis {
    margin: 1rem 0 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

/* Contact */

.contact-content {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1rem;
    max-width: 1100px;
    margin-inline: auto;
}

.contact-item {
    display: flex;
    min-width: 0;
    min-height: 118px;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    padding: 1rem 1.1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    background: var(--color-white);
    text-align: left;
    transition:
        border-color var(--transition-fast),
        color var(--transition-fast),
        transform var(--transition-fast),
        box-shadow var(--transition-fast);
}

.contact-item:hover,
.contact-item:focus-visible {
    transform: translateY(-1px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.contact-label {
    display: block;
    color: var(--color-text);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.contact-value {
    display: block;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: 1.6;
    overflow-wrap: anywhere;
}

.contact-item:hover .contact-value,
.contact-item:focus-visible .contact-value {
    color: var(--color-primary-dark);
}

.contact-item:focus-visible {
    outline: 3px solid var(--color-primary);
    outline-offset: 3px;
}

/* Footer */

.site-footer {
    padding-block: 1.5rem;
    color: var(--color-white);
    background: var(--color-text);
}

.footer-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem 2rem;
}

.footer-text {
    margin: 0;
    color: rgba(255, 255, 255, 0.76);
    font-size: var(--font-size-sm);
}