/* ============================================
   HRVOJE KRIZIC - MINIMALIST PERSONAL WEBSITE
   Physics | Cellist | Teaching
   ============================================ */

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

:root {
    --bg: #fafafa;
    --bg-dark: #0a0a0a;
    --text: #1a1a1a;
    --text-light: #555;
    --text-muted: #888;
    --accent: #2d3436;
    --accent-hover: #636e72;
    --border: #ddd;
    --white: #fff;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
}

::selection {
    background: var(--accent);
    color: var(--white);
}

/* --- Typography --- */
h1, h2, h3, h4 {
    font-weight: 500;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

h1 {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 300;
}

h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    margin-bottom: 1.5rem;
}

h3 {
    font-size: 1.25rem;
    color: var(--text-light);
    font-weight: 400;
}

p {
    color: var(--text-light);
    max-width: 65ch;
}

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

/* --- Layout --- */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
}

.section {
    padding: 8rem 0;
    background: var(--bg);
    position: relative;
    z-index: 1;
}

.section--tight {
    padding: 4rem 0;
}

@media (max-width: 768px) {
    .section {
        padding: 4rem 0;
    }

    .section--tight {
        padding: 2rem 0;
    }
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(250, 250, 250, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
}

.nav--light .nav__logo,
.nav--light .nav__link {
    color: var(--white);
}

.nav--light .nav__toggle span {
    background: var(--white);
}

.nav--light.scrolled .nav__logo,
.nav--light.scrolled .nav__link {
    color: var(--text);
}

.nav--light.scrolled .nav__toggle span {
    background: var(--text);
}

.nav__inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav__logo {
    font-size: 1.1rem;
    font-weight: 500;
    letter-spacing: 0.05em;
}

.nav__links {
    display: flex;
    gap: 2.5rem;
    list-style: none;
}

.nav__link {
    font-size: 0.9rem;
    color: var(--text-light);
    position: relative;
    padding: 0.25rem 0;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: currentColor;
    transition: var(--transition);
}

.nav__link:hover {
    color: var(--text);
}

.nav--light .nav__link:hover {
    color: var(--white);
}

.nav--light.scrolled .nav__link:hover {
    color: var(--text);
}

.nav__link:hover::after {
    width: 100%;
}

.nav__link--subtle {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.nav__link--btn {
    padding: 0.4rem 0.9rem;
    border: 1px solid var(--text);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.nav__link--btn::after {
    display: none;
}

.nav__link--btn:hover {
    background: var(--text);
    color: var(--white);
}

.nav--light .nav__link--btn {
    border-color: var(--white);
}

.nav--light .nav__link--btn:hover {
    background: var(--white);
    color: var(--text);
}

.nav--light.scrolled .nav__link--btn {
    border-color: var(--text);
}

.nav--light.scrolled .nav__link--btn:hover {
    background: var(--text);
    color: var(--white);
}

/* Mobile Menu */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.nav__toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    transition: var(--transition);
}

@media (max-width: 768px) {
    .nav__toggle {
        display: flex;
    }

    .nav__links {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        height: 100vh;
        background: var(--bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 2rem;
        transition: var(--transition);
        opacity: 0;
        visibility: hidden;
    }

    .nav__links.active {
        opacity: 1;
        visibility: visible;
    }

    .nav__links.active .nav__link {
        color: var(--text);
    }

    .nav__links.active + .nav__toggle span {
        background: var(--text);
    }

    .nav__links.active + .nav__toggle span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .nav__links.active + .nav__toggle span:nth-child(2) {
        opacity: 0;
        transform: scaleX(0.5);
    }

    .nav__links.active + .nav__toggle span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .nav__link {
        font-size: 1.5rem;
    }

    .nav__link--subtle {
        font-size: 1.2rem;
    }

    .nav__link--btn,
    .nav--light .nav__link--btn {
        font-size: 1.5rem;
        padding: 0.5rem 1.5rem;
        text-transform: none;
        border: 1px solid var(--text);
        color: var(--text);
    }

    .nav__link--btn:hover,
    .nav--light .nav__link--btn:hover {
        background: var(--text);
        color: var(--white);
    }
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero__content {
    position: relative;
    z-index: 2;
}

.hero__title {
    margin-bottom: 1rem;
}

.hero__subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    font-weight: 300;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero__description {
    margin-top: 2rem;
    font-size: 1.1rem;
}

.hero__scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.8rem;
    color: var(--text-muted);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    animation: bounce 2s infinite;
    z-index: 2;
}

.hero__scroll::after {
    content: '';
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--text-muted), transparent);
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

@media (max-width: 768px) {
    .hero__subtitle {
        font-size: 1rem;
    }

    .hero__description {
        font-size: 1rem;
    }
}

/* --- Image Hero --- */
.hero--image {
    position: relative;
}

.hero__bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: grayscale(100%) brightness(0.45) contrast(1.1);
    z-index: 0;
    will-change: transform;
    transform: translateZ(0);
}

@media (max-width: 768px) {
    .hero__bg {
        position: absolute;
        height: 100%;
    }
}

.hero--image::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0,0,0,0.2) 0%,
        rgba(0,0,0,0.4) 100%
    );
    z-index: 1;
}

.hero--image .hero__content {
    color: var(--white);
}

.hero--image .hero__subtitle {
    color: rgba(255,255,255,0.85);
}

.hero--image .hero__description {
    color: rgba(255,255,255,0.8);
}

.hero--image .hero__scroll {
    color: rgba(255,255,255,0.85);
    cursor: pointer;
}

.hero--image .hero__scroll:hover {
    color: rgba(255,255,255,1);
}

.hero--image .hero__scroll::after {
    background: linear-gradient(to bottom, rgba(255,255,255,0.85), transparent);
}

/* --- About Section --- */
.about {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    align-items: start;
}

.about__image {
    position: relative;
    overflow: hidden;
}

.about__image img {
    width: 100%;
    height: auto;
    filter: grayscale(20%);
    transition: var(--transition);
}

.about__image:hover img {
    filter: grayscale(0%);
    transform: scale(1.02);
}

.about__content h2 {
    margin-bottom: 2rem;
}

.about__text {
    margin-bottom: 1.5rem;
}

.about__links {
    display: flex;
    gap: 1.5rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.about__link {
    font-size: 0.9rem;
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.about__link:hover {
    border-color: var(--text);
}

@media (max-width: 900px) {
    .about {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .about__image {
        max-width: 400px;
        margin: 0 auto;
    }
}

/* --- Projects --- */
.projects {
    display: grid;
    gap: 6rem;
}

.project {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    padding-bottom: 4rem;
    border-bottom: 1px solid var(--border);
}

.project:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.project__meta {
    font-size: 0.85rem;
}

.project__label {
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.project__date {
    color: var(--text-light);
    margin-bottom: 1.5rem;
}

.project__supervisors {
    margin-top: 1.5rem;
}

.project__supervisors h4 {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.project__supervisors li {
    font-size: 0.9rem;
    color: var(--text-light);
    list-style: none;
    margin-bottom: 0.25rem;
}

.project__content h3 {
    font-size: 1.5rem;
    color: var(--text);
    margin-bottom: 1rem;
}

.project__question {
    font-style: italic;
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.project__image {
    margin-top: 2rem;
}

.project__image img {
    width: 100%;
    height: auto;
}

.project__image figcaption {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

@media (max-width: 900px) {
    .project {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .projects {
        gap: 4rem;
    }
}

/* --- Featured Project (PhD) --- */
.project.project--featured {
    background: linear-gradient(135deg, rgba(0,0,0,0.03) 0%, rgba(0,0,0,0.01) 100%);
    padding: 3rem 3rem 5rem 3rem;
    border-left: 3px solid var(--text);
    border-bottom: none;
    margin-bottom: 2rem;
}

.project--featured .project__label {
    font-size: 0.95rem;
    color: var(--text);
}

.project--featured .project__content h3 {
    font-size: 1.75rem;
}

@media (max-width: 900px) {
    .project--featured {
        padding: 2rem 1.5rem;
    }
}

/* --- Projects Section Divider --- */
.projects__section-title {
    font-size: 2.5rem;
    font-weight: 300;
    letter-spacing: -0.03em;
    color: var(--text);
    margin-bottom: 2.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--text);
    display: inline-block;
}

/* --- Concerts --- */
.concerts {
    display: grid;
    gap: 0;
}

.concert {
    display: grid;
    grid-template-columns: 150px 1fr;
    gap: 3rem;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border);
    transition: var(--transition);
}

.concert:hover {
    background: rgba(0,0,0,0.02);
    padding-left: 1rem;
    padding-right: 1rem;
    margin-left: -1rem;
    margin-right: -1rem;
}

.concert__date {
    font-size: 1.1rem;
    font-weight: 500;
    line-height: 1.4;
}

.concert__time {
    display: block;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-top: 0.25rem;
}

.concert__info h4 {
    font-size: 1.1rem;
    color: var(--text);
    margin-bottom: 0.25rem;
}

.concert__venue {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.concert__program {
    margin-top: 0.5rem;
    font-size: 0.9rem;
}

@media (max-width: 600px) {
    .concert {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }

    .concert__date {
        display: flex;
        align-items: baseline;
        gap: 1rem;
    }

    .concert__time {
        display: inline;
        margin-top: 0;
    }
}

.concert__links {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.btn {
    display: inline-block;
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
    letter-spacing: 0.05em;
    border: 1px solid var(--text);
    background: transparent;
    color: var(--text);
    transition: var(--transition);
    text-transform: uppercase;
}

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

.btn--small {
    padding: 0.4rem 0.8rem;
    font-size: 0.75rem;
}

/* --- Media Section --- */
.media-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.media-item {
    aspect-ratio: 16/9;
    background: var(--bg-dark);
    border-radius: 4px;
    overflow: hidden;
}

.media-item iframe {
    width: 100%;
    height: 100%;
    border: none;
}

.media-item--full {
    grid-column: 1 / -1;
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

@media (max-width: 768px) {
    .media-grid {
        grid-template-columns: 1fr;
    }
}

/* --- Organizer Photos --- */
.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
}

.photo-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: var(--transition);
}

.photo-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 30px rgba(0,0,0,0.08);
}

.photo-card__image {
    display: block;
    aspect-ratio: 4 / 5;
    overflow: hidden;
    background: rgba(0,0,0,0.04);
}

.photo-card__image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.photo-card__body {
    padding: 1rem 1.25rem 1.25rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
}

.photo-card__title {
    font-size: 0.95rem;
    color: var(--text);
    font-weight: 500;
}

/* --- Contact --- */
.contact {
    text-align: center;
}

.contact h2 {
    margin-bottom: 2rem;
}

.contact__info {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 2rem 0;
}

.contact__item {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.contact__item a {
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.contact__item a:hover {
    color: var(--text);
    border-bottom-color: var(--text);
}

.contact__social {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 3rem;
}

.contact__social a {
    color: var(--text-muted);
    font-size: 1.5rem;
    transition: var(--transition);
}

.contact__social a:hover {
    color: var(--text);
    transform: translateY(-3px);
}

/* --- Footer --- */
.footer {
    padding: 3rem 0;
    text-align: center;
    border-top: 1px solid var(--border);
    background: var(--bg);
    position: relative;
    z-index: 1;
}

.footer p {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin: 0 auto;
}

/* --- Page Header with Background --- */
.page-header {
    padding-top: 0;
    padding-bottom: 0;
    min-height: 50vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-header__bg {
    position: absolute;
    inset: 0;
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    filter: grayscale(100%) brightness(0.35) contrast(1.1);
    z-index: 0;
}

.page-header::before {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(0,0,0,0.1) 0%,
        rgba(0,0,0,0.3) 100%
    );
    z-index: 1;
}

.page-header .container {
    position: relative;
    z-index: 2;
}

.page-header h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    color: var(--white);
    margin-bottom: 0.5rem;
}

.page-header p {
    color: rgba(255,255,255,0.85);
    margin: 1rem auto 0;
    max-width: 600px;
    font-size: 1.1rem;
}

/* --- Simple Page Header (no bg) --- */
.page-header--simple {
    min-height: auto;
    padding-top: 10rem;
    padding-bottom: 4rem;
    background: none;
}

.page-header--simple::before {
    display: none;
}

.page-header--simple h1 {
    color: var(--text);
}

.page-header--simple p {
    color: var(--text-light);
}

/* --- Biography Compact --- */
.bio-compact {
    background: linear-gradient(135deg, rgba(0,0,0,0.03) 0%, rgba(0,0,0,0.01) 100%);
    padding: 3rem;
    margin-bottom: 4rem;
    border-left: 3px solid var(--text);
}

.bio-compact p {
    max-width: none;
}

@media (max-width: 768px) {
    .bio-compact {
        padding: 2rem 1.5rem;
    }
}

/* --- Utilities --- */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-4 { margin-top: 4rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-4 { margin-bottom: 4rem; }

/* --- Divider --- */
.divider {
    width: 60px;
    height: 1px;
    background: var(--border);
    margin: 2rem auto;
}

/* --- Page Transitions --- */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s ease forwards;
}

@keyframes fadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-delay-1 { animation-delay: 0.1s; }
.fade-in-delay-2 { animation-delay: 0.2s; }
.fade-in-delay-3 { animation-delay: 0.3s; }