/* ====================================
   GLOBAL STYLES & RESET
   ==================================== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color palette */
    --color-primary: #16424a;
    --color-primary-light: #2a6f77;
    --color-accent: #e2703a;
    --color-accent-light: #f3a56b;
    --color-ink: #1c2321;
    --color-ink-muted: #5c6863;
    --color-bg: #faf8f4;
    --color-surface: #ffffff;
    --color-border: #e6e2da;

    /* Spacing */
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 2rem;
    --space-lg: 3.5rem;
    --space-xl: 6rem;

    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.65;

    /* Effects */
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-pill: 999px;
    --shadow-float: 0 8px 30px rgba(22, 66, 74, 0.14);
    --shadow-card: 0 2px 10px rgba(28, 35, 33, 0.06);
    --transition: 0.25s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-base);
    color: var(--color-ink);
    background-color: var(--color-bg);
}

.container {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

h1, h2, h3 {
    color: var(--color-primary);
    font-weight: 700;
    line-height: 1.25;
}

a {
    color: var(--color-primary-light);
}

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

/* Respect reduced-motion preference */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}

/* Skip link for keyboard/screen-reader users */
.skip-link {
    position: absolute;
    top: -100px;
    left: var(--space-sm);
    background: var(--color-primary);
    color: #fff;
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-sm);
    z-index: 2000;
    transition: top var(--transition);
}

.skip-link:focus {
    top: var(--space-sm);
}

/* Visible focus state everywhere */
a:focus-visible,
button:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* ====================================
   FLOATING NAVIGATION BAR
   ==================================== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: var(--space-sm) var(--space-sm) 0;
}

.nav-float {
    max-width: 1140px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: rgba(250, 248, 244, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 0.6rem 0.75rem 0.6rem 1.1rem;
    box-shadow: var(--shadow-float);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 1.15rem;
}

.brand-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
    border-radius: 50%;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

/* Language toggle */
.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.35rem;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 0.4rem 0.75rem;
    cursor: pointer;
    color: var(--color-primary);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 600;
    transition: background-color var(--transition), border-color var(--transition);
}

.lang-toggle:hover {
    background-color: rgba(22, 66, 74, 0.06);
    border-color: var(--color-primary-light);
}

.lang-icon {
    width: 18px;
    height: 18px;
}

/* Hamburger toggle */
.nav-toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 42px;
    height: 42px;
    background: var(--color-primary);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    padding: 0;
}

.nav-toggle span {
    display: block;
    width: 18px;
    height: 2px;
    margin: 0 auto;
    background-color: #fff;
    border-radius: 2px;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ====================================
   FULL-SCREEN NAV OVERLAY
   ==================================== */
.nav-overlay {
    position: fixed;
    inset: 0;
    z-index: 1500;
    background: var(--color-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-12px);
    transition: opacity var(--transition), transform var(--transition), visibility 0s linear var(--transition);
}

.nav-overlay.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    transition: opacity var(--transition), transform var(--transition), visibility 0s;
}

.nav-close {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    width: 46px;
    height: 46px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.35);
    background: transparent;
    color: #fff;
    font-size: 1.75rem;
    line-height: 1;
    cursor: pointer;
}

.nav-close:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-overlay-menu {
    list-style: none;
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.nav-overlay-link {
    color: #fff;
    text-decoration: none;
    font-size: clamp(1.5rem, 5vw, 2.5rem);
    font-weight: 700;
    padding: 0.3rem 1rem;
    display: inline-block;
    position: relative;
}

.nav-overlay-link::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -2px;
    width: 0;
    height: 3px;
    background: var(--color-accent);
    transition: width var(--transition), left var(--transition);
}

.nav-overlay-link:hover::after,
.nav-overlay-link:focus-visible::after {
    width: 60%;
    left: 20%;
}

/* ====================================
   SECTIONS (shared)
   ==================================== */
.section {
    padding: var(--space-xl) 0;
    scroll-margin-top: 90px;
}

.section-alt {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.section-title {
    font-size: clamp(1.6rem, 3vw, 2.1rem);
    margin-bottom: var(--space-sm);
    text-align: center;
}

.section-intro {
    text-align: center;
    color: var(--color-ink-muted);
    max-width: 640px;
    margin: 0 auto var(--space-lg);
}

.subsection-title {
    font-size: 1.4rem;
    margin: var(--space-lg) 0 var(--space-md);
}

/* ====================================
   ABOUT / HERO SECTION
   ==================================== */
.hero-section {
    padding-top: var(--space-lg);
}

.eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-size: 0.85rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.hero-section h1 {
    font-size: clamp(1.8rem, 4vw, 2.75rem);
    max-width: 900px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-primary-light);
    font-weight: 600;
    margin-top: var(--space-sm);
}

.about-lead {
    max-width: 760px;
    margin-top: var(--space-md);
    color: var(--color-ink-muted);
    font-size: 1.05rem;
}

/* ====================================
   GOALS
   ==================================== */
.goals-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--space-md);
}

.goal-item {
    background: var(--color-surface);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-accent);
    box-shadow: var(--shadow-card);
}

.goal-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: var(--space-xs);
}

.goal-title {
    font-size: 1.15rem;
    margin-bottom: var(--space-xs);
}

.goal-description {
    color: var(--color-ink-muted);
}

/* ====================================
   NEWS
   ==================================== */
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-md);
}

.news-item {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    transition: transform var(--transition), box-shadow var(--transition);
}

.news-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-card);
}

.news-date {
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: var(--space-xs);
}

.news-title {
    font-size: 1.2rem;
    margin-bottom: var(--space-xs);
}

.news-content {
    color: var(--color-ink-muted);
}

/* ====================================
   RESULTS / PUBLICATIONS
   ==================================== */
.publications-list {
    max-width: 860px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.publication-item {
    background: var(--color-bg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition);
}

.publication-item:hover {
    box-shadow: var(--shadow-card);
}

.pub-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-xs);
    flex-wrap: wrap;
}

.publication-title {
    font-size: 1.15rem;
    flex: 1;
    min-width: 250px;
}

.pub-status {
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: 0.8rem;
    font-weight: 600;
    white-space: nowrap;
}

.pub-status-published {
    background-color: #d9ecd0;
    color: #2e5c1f;
}

.pub-status-inpress {
    background-color: #d3e6e8;
    color: #145156;
}

.pub-status-review {
    background-color: #faeacb;
    color: #7a5310;
}

.pub-status-planned {
    background-color: #e6e2da;
    color: #4a4640;
}

.publication-authors {
    color: var(--color-ink-muted);
    font-style: italic;
    margin-bottom: var(--space-xs);
}

.publication-venue {
    color: var(--color-ink);
    margin-bottom: var(--space-xs);
}

.publication-link {
    display: inline-block;
    margin-top: var(--space-xs);
    color: var(--color-primary-light);
    font-weight: 600;
    text-decoration: none;
}

.publication-link:hover {
    color: var(--color-accent);
}

@media (max-width: 640px) {
    .pub-header {
        flex-direction: column;
        align-items: flex-start;
    }
    .publication-title {
        min-width: 100%;
    }
}

/* ====================================
   TEAM
   ==================================== */
.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--space-md);
}

.team-member {
    background: var(--color-bg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    text-align: center;
    box-shadow: var(--shadow-card);
    transition: transform var(--transition);
}

.team-member:hover {
    transform: translateY(-4px);
}

.team-photo {
    width: 110px;
    height: 110px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #fff;
    margin: 0 auto var(--space-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    font-weight: 700;
}

.team-name {
    font-size: 1.1rem;
    margin-bottom: var(--space-xs);
}

.team-role {
    color: var(--color-accent);
    font-weight: 600;
    font-size: 0.95rem;
    margin-bottom: var(--space-xs);
}

.team-bio {
    color: var(--color-ink-muted);
    font-size: 0.92rem;
    text-align: left;
}

/* ====================================
   CONTACT
   ==================================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--space-md);
    max-width: 900px;
    margin: 0 auto;
}

.contact-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    text-align: center;
}

.contact-card h3 {
    font-size: 1rem;
    margin-bottom: var(--space-xs);
    color: var(--color-accent);
}

.contact-card a {
    text-decoration: none;
    font-weight: 600;
}

/* ====================================
   FUNDING ACKNOWLEDGEMENT
   ==================================== */
.funding-section {
    background-color: var(--color-surface);
    padding: var(--space-lg) 0;
    border-top: 1px solid var(--color-border);
}

.funding-title {
    font-size: 1.3rem;
    text-align: center;
    margin-bottom: var(--space-md);
}

.funding-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: var(--space-md);
    align-items: center;
    justify-items: center;
    max-width: 900px;
    margin: 0 auto;
}

.funding-logo {
    width: 100%;
    max-width: 160px;
    height: 90px;
    object-fit: contain;
    filter: grayscale(60%);
    opacity: 0.85;
    transition: all var(--transition);
}

.funding-logo:hover {
    filter: grayscale(0%);
    opacity: 1;
}

/* ====================================
   FOOTER
   ==================================== */
.site-footer {
    background-color: var(--color-primary);
    color: #fff;
    padding: var(--space-md) 0;
    text-align: center;
    font-size: 0.85rem;
}

.site-footer a {
    color: #fff;
}

/* ====================================
   RESPONSIVE ADJUSTMENTS
   ==================================== */
@media (max-width: 640px) {
    :root {
        --space-xl: 3.5rem;
        --space-lg: 2.5rem;
    }

    .nav-float {
        padding: 0.5rem 0.5rem 0.5rem 0.85rem;
    }

    .brand-name {
        font-size: 1rem;
    }

    .lang-toggle .lang-code {
        display: none;
    }

    .lang-toggle {
        padding: 0.45rem;
        border-radius: 50%;
    }

    .team-bio {
        text-align: center;
    }
}