@font-face {
    font-family: 'Carlito';
    src: url('../assets/fonts/Carlito-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Carlito';
    src: url('../assets/fonts/Carlito-Bold.ttf') format('truetype');
    font-weight: 700;
    font-style: normal;
    font-display: swap;
}

@font-face {
    font-family: 'Carlito';
    src: url('../assets/fonts/Carlito-Italic.ttf') format('truetype');
    font-weight: 400;
    font-style: italic;
    font-display: swap;
}

@font-face {
    font-family: 'Carlito';
    src: url('../assets/fonts/Carlito-BoldItalic.ttf') format('truetype');
    font-weight: 700;
    font-style: italic;
    font-display: swap;
}

/* ---- Reset & Base ---- */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-dark: #3b3a3f;
    --color-blue: #4f7297;
    --color-blue-light: #8093a9;
    --color-gray-light: #e7e8ea;
    --color-gray-border: #d9dade;
    --color-bg: #ffffff;
    --color-bg-alt: #f6f7f9;
    --color-text: #3b3a3f;
    --color-text-muted: #6b6a70;
    --max-width: 1100px;
    --radius: 8px;
    --transition: 0.25s ease;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: 'Carlito', 'Calibri', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    font-size: 17px;
}

a {
    color: var(--color-blue);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-dark);
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ---- Header ---- */
#header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-gray-border);
    z-index: 1000;
    transition: box-shadow var(--transition);
}

#header.scrolled {
    box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

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

.header-logo {
    height: 70px;
    width: auto;
}

.nav-wrapper {
    display: flex;
    align-items: center;
    gap: 20px;
}

/* ---- Language toggle ---- */
.lang-toggle {
    background: none;
    border: 2px solid var(--color-blue);
    color: var(--color-blue);
    font-family: inherit;
    font-weight: 700;
    font-size: 14px;
    padding: 5px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    line-height: 1;
}

.lang-toggle:hover {
    background: var(--color-blue);
    color: #fff;
}

/* ---- Navigation ---- */
#nav ul {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

#nav a {
    color: var(--color-text);
    font-weight: 700;
    font-size: 16px;
    padding: 8px 0;
    transition: color var(--transition);
}

#nav a:hover {
    color: var(--color-blue);
}

#nav a.nav-cta {
    background: var(--color-blue);
    color: #fff;
    padding: 10px 24px;
    border-radius: var(--radius);
    transition: background var(--transition);
}

#nav a.nav-cta:hover {
    background: var(--color-dark);
    color: #fff;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 26px;
    height: 3px;
    background: var(--color-dark);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

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

.nav-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ---- About Me (intro) ---- */
#about-me {
    margin-top: 72px;
    padding: 36px 0 36px;
    text-align: center;
    background: linear-gradient(135deg, #f6f7f9 0%, #ffffff 50%, #eef0f3 100%);
}

.about-me-logo {
    width: 240px;
    height: auto;
    margin: 0 auto 36px;
}

#about-me h1 {
    font-size: clamp(28px, 5vw, 48px);
    font-weight: 700;
    color: var(--color-dark);
    margin-bottom: 20px;
    line-height: 1.2;
}

.about-me-subtitle {
    font-size: clamp(17px, 2.5vw, 22px);
    color: var(--color-text-muted);
    max-width: 700px;
    margin: 0 auto 32px;
}

.about-me-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}

.about-me-tags span {
    background: var(--color-bg);
    border: 1px solid var(--color-gray-border);
    color: var(--color-blue);
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 700;
}

/* ---- Buttons ---- */
.btn {
    display: inline-block;
    padding: 14px 36px;
    border-radius: var(--radius);
    font-size: 17px;
    font-weight: 700;
    cursor: pointer;
    border: none;
    transition: background var(--transition), transform var(--transition), opacity var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--color-blue);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-dark);
    color: #fff;
    transform: translateY(-2px);
}

.btn:active {
    transform: translateY(0);
}

/* ---- Sections ---- */
.section {
    padding: 40px 0;
}

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

.section-title {
    font-size: clamp(26px, 4vw, 36px);
    font-weight: 700;
    color: var(--color-dark);
    text-align: center;
    margin-bottom: 24px;
}

/* ---- About ---- */
.about-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 48px;
    align-items: start;
}

.about-text p {
    margin-bottom: 18px;
}

.profile-links {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 6px;
}

.profile-link {
    color: var(--color-blue);
    font-weight: 700;
    font-size: 16px;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: border-color var(--transition);
}

.profile-link:hover {
    border-bottom-color: var(--color-blue);
}

.about-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.profile-photo {
    width: 100%;
    max-width: 260px;
    height: auto;
    border-radius: var(--radius);
    margin: 0 auto 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.1);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-blue-light);
}

.info-value {
    font-size: 16px;
    color: var(--color-text);
}

.availability {
    color: #2d8a4f;
    font-weight: 700;
}

/* ---- Skills ---- */
.skills-categories {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 28px;
}

.skill-category {
    flex: 1 1 280px;
    max-width: 380px;
    background: var(--color-bg);
    border: 1px solid var(--color-gray-border);
    border-radius: var(--radius);
    padding: 32px;
}

.skill-category h3 {
    font-size: 18px;
    color: var(--color-dark);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-blue);
    display: inline-block;
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.skill-tags span {
    background: var(--color-gray-light);
    color: var(--color-dark);
    padding: 8px 18px;
    border-radius: 50px;
    font-size: 15px;
    font-weight: 700;
}

/* ---- Services ---- */
.services-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 28px;
}

.service-card {
    flex: 1 1 300px;
    max-width: 380px;
    background: var(--color-bg);
    border: 1px solid var(--color-gray-border);
    border-radius: var(--radius);
    padding: 32px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.service-card:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.service-card h3 {
    font-size: 20px;
    color: var(--color-blue);
    margin-bottom: 10px;
    padding-bottom: 12px;
    border-bottom: 2px solid var(--color-blue);
    display: inline-block;
}

.service-card p {
    font-size: 15px;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* ---- Projects ---- */
.projects-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 28px;
}

.project-card {
    flex: 1 1 300px;
    max-width: 380px;
    background: var(--color-bg);
    border: 1px solid var(--color-gray-border);
    border-radius: var(--radius);
    padding: 32px;
    transition: box-shadow var(--transition), transform var(--transition);
}

.project-card:hover {
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.08);
    transform: translateY(-4px);
}

.project-card h3 {
    font-size: 22px;
    color: var(--color-blue);
    margin-bottom: 6px;
}

.project-subtitle {
    font-size: 15px;
    color: var(--color-text-muted);
    margin-bottom: 4px;
}

.project-org {
    font-size: 14px;
    color: var(--color-blue-light);
    font-weight: 700;
    margin-bottom: 16px;
}

.project-card ul {
    list-style: none;
}

.project-card ul li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    font-size: 15px;
    border-bottom: 1px solid var(--color-gray-light);
}

.project-card ul li:last-child {
    border-bottom: none;
}

.project-card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 16px;
    width: 8px;
    height: 8px;
    background: var(--color-blue);
    border-radius: 50%;
}

/* ---- Publications ---- */
.publications-list {
    list-style: none;
    max-width: 820px;
    margin: 0 auto;
}

.pub-note {
    text-align: center;
    font-size: 15px;
    color: var(--color-text-muted);
    margin: -12px 0 12px;
    font-style: italic;
}

.publications-list li {
    padding: 16px 0;
    border-bottom: 1px solid var(--color-gray-light);
}

.publications-list li:last-child {
    border-bottom: none;
}

.pub-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.pub-item a {
    color: var(--color-text);
    font-weight: 700;
    font-size: 16px;
    line-height: 1.4;
    text-decoration: none;
    transition: color var(--transition);
}

.pub-item a:hover {
    color: var(--color-blue);
}

.pub-meta {
    font-size: 14px;
    color: var(--color-text-muted);
}

.pub-authors {
    font-size: 14px;
    color: var(--color-text);
    line-height: 1.4;
}

/* ---- Contact ---- */
.contact-intro {
    text-align: center;
    color: var(--color-text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.contact-form {
    max-width: 680px;
    margin: 0 auto;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 700;
    font-size: 15px;
    color: var(--color-text);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-gray-border);
    border-radius: var(--radius);
    font-size: 16px;
    font-family: inherit;
    color: var(--color-text);
    background: var(--color-bg);
    transition: border-color var(--transition), box-shadow var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-blue);
    box-shadow: 0 0 0 3px rgba(79, 114, 151, 0.12);
}

.form-group textarea {
    resize: vertical;
}

.hp-field {
    position: absolute;
    left: -9999px;
    opacity: 0;
    height: 0;
    overflow: hidden;
}

.form-status {
    text-align: center;
    margin-top: 16px;
    font-weight: 700;
    min-height: 24px;
}

.form-status.success {
    color: #2d8a4f;
}

.form-status.error {
    color: #c0392b;
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

/* ---- Footer ---- */
footer {
    background: var(--color-dark);
    color: #fff;
    padding: 12px 0;
}

.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.footer-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-logo {
    height: 100px;
    width: auto;
}

.footer-left p {
    color: var(--color-blue-light);
    font-size: 15px;
}

.footer-right p {
    color: var(--color-blue-light);
    font-size: 15px;
}

.footer-right a {
    color: var(--color-blue-light);
    transition: color var(--transition);
}

.footer-right a:hover {
    color: #fff;
}

/* ---- Legal Pages ---- */
.legal-section {
    margin-top: 72px;
    padding: 40px 0;
}

.legal-content {
    max-width: 800px;
    margin: 0 auto;
}

.legal-content h2 {
    font-size: 20px;
    color: var(--color-dark);
    margin-top: 32px;
    margin-bottom: 12px;
}

.legal-content h2:first-child {
    margin-top: 0;
}

.legal-content p {
    margin-bottom: 16px;
    line-height: 1.5;
}

.legal-content ul {
    margin-bottom: 16px;
    padding-left: 24px;
}

.legal-content li {
    margin-bottom: 8px;
    line-height: 1.5;
}

.legal-content a {
    color: var(--color-blue);
    text-decoration: underline;
}

/* ---- Responsive ---- */
@media (max-width: 768px) {
    #nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-gray-border);
        transform: translateY(-150%);
        transition: transform 0.35s ease;
        padding: 20px 0;
    }

    #nav.open {
        transform: translateY(0);
    }

    #nav ul {
        flex-direction: column;
        gap: 16px;
        align-items: center;
    }

    .nav-toggle {
        display: flex;
    }

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    #about-me {
        padding: 36px 0 36px;
    }

    .about-me-logo {
        width: 180px;
        margin-bottom: 24px;
    }

    .section {
        padding: 56px 0;
    }

    .legal-section {
        padding: 56px 0;
    }
}