/* ===== GLOBÁLNÍ NASTAVENÍ ===== */

:root {
    --primary: #39ff14;
    --secondary: #00d4ff;
    --bg-dark: #0a0c10;
    --card-bg: rgba(255, 255, 255, 0.05);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    background-color: var(--bg-dark);
    color: #f0f0f0;
    line-height: 1.6;
    overflow-x: hidden;
    background: radial-gradient(circle at bottom, #1a2a2d 0%, #0a0c10 100%);
}

/* Bubliny na pozadí */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;

    background-image:
        radial-gradient(
            circle,
            rgba(57, 255, 20, 0.1) 1px,
            transparent 1px
        ),
        radial-gradient(
            circle,
            rgba(0, 212, 255, 0.05) 1px,
            transparent 1px
        );

    background-size: 40px 40px, 60px 60px;
    z-index: -1;
}


/* ===== NAVIGACE ===== */

.navbar {
    position: sticky;
    top: 0;
    background: rgba(10, 12, 16, 0.8);
    backdrop-filter: blur(15px);
    padding: 15px 0;
    z-index: 1000;
    border-bottom: 2px solid var(--primary);
}

.navbar ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 0;
    padding: 0;
}

.navbar a {
    color: #fff;
    text-decoration: none;
    font-weight: bold;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 2px;
    transition: 0.3s;
    padding: 8px 16px;
    border-radius: 5px;
}

.navbar a:hover {
    color: var(--primary);
    text-shadow: 0 0 10px var(--primary);
    background: rgba(57, 255, 20, 0.1);
}


/* ===== HEADER ===== */

header {
    padding: 100px 20px;
    text-align: center;
    background: linear-gradient(
        180deg,
        rgba(57, 255, 20, 0.05) 0%,
        transparent 100%
    );
}

.header-flex h1 {
    font-size: clamp(3rem, 12vw, 5rem);
    margin: 0;
    color: #fff;
    text-shadow: 0 0 20px rgba(57, 255, 20, 0.5);
    letter-spacing: -2px;
}

header p {
    font-size: 1.2rem;
    color: var(--secondary);
    font-weight: 300;
    margin-top: 10px;
}


/* ===== ANIMACE TEXTU ===== */

#brace-typing {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin: 40px 0;
}

.brace {
    font-size: 3rem;
    filter: drop-shadow(0 0 10px var(--primary));
}

#animatedText span {
    font-family: 'Courier New', monospace;
    font-size: 2.5rem;
    color: var(--primary);
    opacity: 0;
    display: inline-block;
    transition: 0.3s;
}

#animatedText span.visible {
    opacity: 1;
    text-shadow: 0 0 15px var(--primary);
    transform: scale(1.1);
}


/* ===== SEKCE ===== */

section {
    background: var(--card-bg);
    max-width: 1000px;
    width: 90%;
    margin: 60px auto;
    padding: 40px;
    border-radius: 30px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    scroll-margin-top: 120px;
    box-sizing: border-box;
}

h2 {
    color: var(--primary);
    text-transform: uppercase;
    font-size: 1.8rem;
    border-left: 5px solid var(--primary);
    padding-left: 15px;
    margin-top: 0;
}

h3 {
    margin-top: 0;
}


/* ===== KARTY POKUSŮ ===== */

.experiment-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.experiment-card {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid rgba(255, 255, 255, 0.08);
    padding: 20px;
    border-radius: 20px;

    transition:
        transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275),
        background 0.4s,
        border-color 0.4s,
        box-shadow 0.4s;

    display: flex;
    flex-direction: column;
}

.experiment-card:hover {
    transform: translateY(-10px);
    background: rgba(57, 255, 20, 0.05);
    border-color: var(--primary);
    box-shadow: 0 0 30px rgba(57, 255, 20, 0.2);
}

.experiment-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 15px;
    filter: grayscale(40%);
    transition: 0.3s;
    margin-bottom: 15px;
}

.experiment-card:hover img {
    filter: grayscale(0%);
}


/* ===== DETAILS / SUMMARY ===== */

details {
    margin-bottom: 20px;
    border-radius: 15px;
    background: rgba(0, 212, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.05);
    overflow: hidden;
}

summary {
    position: relative;
    padding: 20px;
    font-size: 1.2rem;
    color: #fff;
    cursor: pointer;
    list-style: none;
    font-weight: bold;
    transition: 0.3s;
    user-select: none;
}

summary::-webkit-details-marker {
    display: none;
}

summary:hover {
    background: rgba(0, 212, 255, 0.1);
    color: var(--secondary);
}

summary::before {
    content: "🧪 ";
}

details[open] > summary {
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}


/* ===== FOTOGALERIE ===== */

.gallery-description {
    margin-bottom: 30px;
    color: #d7d7d7;
}

.gallery-year {
    overflow: hidden;
    border: 1px solid rgba(57, 255, 20, 0.25);
    background: rgba(57, 255, 20, 0.025);
}

.gallery-year > summary {
    position: relative;
    padding-right: 60px;
    color: var(--primary);
    font-size: 1.3rem;
}

.gallery-year > summary::before {
    content: "";
}

.gallery-year > summary::after {
    content: "▼";
    position: absolute;
    right: 25px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--secondary);
    transition: transform 0.3s ease;
}

.gallery-year[open] > summary::after {
    transform: translateY(-50%) rotate(180deg);
}

.gallery-year[open] > summary {
    border-bottom: 1px solid rgba(57, 255, 20, 0.2);
    background: rgba(57, 255, 20, 0.08);
}


/* ===== MŘÍŽKA FOTOGRAFIÍ ===== */

.photo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 18px;
    padding: 25px;
}

.photo-item {
    position: relative;
    height: 190px;
    padding: 0;
    border: 2px solid transparent;
    border-radius: 16px;
    overflow: hidden;
    cursor: pointer;
    background: #111;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.4);

    transition:
        transform 0.3s ease,
        border-color 0.3s ease,
        box-shadow 0.3s ease;
}

.photo-item::after {
    content: "🔍 Zvětšit";
    position: absolute;
    left: 0;
    right: 0;
    bottom: 0;
    padding: 12px;
    color: white;
    font-weight: bold;
    text-align: center;

    background: linear-gradient(
        transparent,
        rgba(0, 0, 0, 0.9)
    );

    opacity: 0;
    transform: translateY(15px);
    transition: 0.3s ease;
}

.photo-item:hover {
    transform: translateY(-7px) scale(1.02);
    border-color: var(--primary);
    box-shadow: 0 0 25px rgba(57, 255, 20, 0.25);
}

.photo-item:hover::after {
    opacity: 1;
    transform: translateY(0);
}

.photo-item:focus-visible {
    outline: 3px solid var(--secondary);
    outline-offset: 4px;
}

.photo-item img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.photo-item:hover img {
    transform: scale(1.08);
}


/* ===== ZVĚTŠENÁ FOTOGRAFIE ===== */

.lightbox {
    position: fixed;
    inset: 0;
    z-index: 5000;

    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;

    padding: 30px;
    box-sizing: border-box;

    background: rgba(0, 0, 0, 0.93);
    backdrop-filter: blur(10px);

    opacity: 0;
    visibility: hidden;

    transition:
        opacity 0.3s ease,
        visibility 0.3s ease;
}

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

.lightbox img {
    display: block;
    max-width: 90vw;
    max-height: 80vh;
    object-fit: contain;

    border-radius: 15px;
    border: 2px solid var(--primary);
    box-shadow: 0 0 40px rgba(57, 255, 20, 0.35);

    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.lightbox.active img {
    transform: scale(1);
}

.lightbox p {
    margin: 18px 0 0;
    color: #fff;
    text-align: center;
    font-weight: bold;
}

.lightbox-close {
    position: fixed;
    top: 20px;
    right: 30px;

    width: 55px;
    height: 55px;
    padding: 0;

    border: 2px solid var(--primary);
    border-radius: 50%;

    background: rgba(10, 12, 16, 0.9);
    color: white;

    font-size: 38px;
    line-height: 45px;

    cursor: pointer;
    transition: 0.3s;
}

.lightbox-close:hover {
    color: var(--primary);
    background: rgba(57, 255, 20, 0.15);
    box-shadow: 0 0 20px rgba(57, 255, 20, 0.5);
    transform: rotate(90deg);
}

.lightbox-close:focus-visible {
    outline: 3px solid var(--secondary);
    outline-offset: 4px;
}

.no-scroll {
    overflow: hidden;
}


/* ===== KONTAKT ===== */

.contact-box {
    border: 2px solid var(--secondary);
    background: rgba(0, 212, 255, 0.05);
    padding: 40px;
    border-radius: 25px;
    text-align: center;
}

.contact-box a {
    color: var(--primary);
    text-decoration: none;
    font-weight: bold;
}

.contact-box a:hover {
    text-decoration: underline;
    text-shadow: 0 0 10px var(--primary);
}


/* ===== TABLETY A MENŠÍ OBRAZOVKY ===== */

@media (max-width: 900px) {
    .navbar ul {
        gap: 12px;
    }

    .navbar a {
        padding: 8px 12px;
    }

    section {
        width: calc(100% - 40px);
        padding: 30px;
    }

    .photo-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }
}


/* ===== MOBILNÍ ZOBRAZENÍ ===== */

@media (max-width: 700px) {
    .navbar {
        padding: 10px 5px;
    }

    .navbar ul {
        gap: 5px;
        flex-wrap: wrap;
    }

    .navbar a {
        display: block;
        padding: 7px 9px;
        font-size: 0.68rem;
        letter-spacing: 1px;
    }

    header {
        padding: 70px 15px;
    }

    .header-flex h1 {
        font-size: clamp(2.7rem, 15vw, 4rem);
    }

    header p {
        font-size: 1rem;
    }

    #brace-typing {
        gap: 10px;
        margin: 25px 0;
    }

    .brace {
        font-size: 2rem;
    }

    #animatedText span {
        font-size: 1.7rem;
    }

    section {
        width: calc(100% - 30px);
        padding: 25px 18px;
        margin: 35px auto;
        border-radius: 20px;
    }

    h2 {
        font-size: 1.45rem;
    }

    .experiment-grid {
        grid-template-columns: 1fr;
        gap: 18px;
    }

    .experiment-card {
        padding: 16px;
    }

    .experiment-card img {
        height: 190px;
    }

    summary {
        padding: 16px;
        font-size: 1rem;
    }

    .gallery-year > summary {
        padding-right: 50px;
        font-size: 1.05rem;
    }

    .gallery-year > summary::after {
        right: 18px;
    }

    .photo-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
        padding: 15px;
    }

    .photo-item {
        height: 140px;
        border-radius: 12px;
    }

    .photo-item::after {
        display: none;
    }

    .lightbox {
        padding: 15px;
    }

    .lightbox img {
        max-width: 96vw;
        max-height: 75vh;
    }

    .lightbox-close {
        top: 10px;
        right: 10px;
        width: 48px;
        height: 48px;
        font-size: 32px;
    }

    .contact-box {
        padding: 25px 15px;
    }
}


/* ===== MALÉ MOBILY ===== */

@media (max-width: 420px) {
    .navbar ul {
        gap: 3px;
    }

    .navbar a {
        padding: 6px 7px;
        font-size: 0.62rem;
    }

    #animatedText span {
        font-size: 1.35rem;
    }

    .brace {
        font-size: 1.6rem;
    }

    section {
        width: calc(100% - 20px);
        padding: 20px 14px;
    }

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

    .photo-item {
        height: 210px;
    }
}