:root {
    --clr-bg: #F9F9F9;
    --clr-text: #212121;
    --clr-primary: #0077B6;
    --clr-primary-dark: #023E8A;
    --clr-accent: #90E0EF;
    --clr-light: #ffffff;
}

*,*::before,*::after{
    box-sizing:border-box;
    margin:0;
    padding:0
}

body{
    font-family:"Inter",sans-serif;
    background:var(--clr-bg);
    color:var(--clr-text);
    line-height:1.6;
    display:flex;
    flex-direction:column;
    min-height:100vh;
    padding-inline:1.25rem;
    transition: background 0.3s, color 0.3s;
}
h1,h2{
    line-height:1.2
}

/* HEADER & NAV */
header{
    position: relative;
    background: linear-gradient(120deg, var(--clr-primary), var(--clr-primary-dark));
    color:#fff;
    padding:2.5rem 1rem 3.5rem;
    text-align:center;
    box-shadow:0 2px 6px rgba(0,0,0,.1);
    overflow: hidden;
    border-radius:0 0 1rem 1rem;
    display:flex;
    flex-direction:column;
    gap:1.25rem;
    align-items:center;
}

header::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background: var(--clr-accent);
}

header h1 {
    font-size: 2.5rem;
    font-weight: 600;
    animation: fadeInDown 1s ease-in-out;
    margin-bottom:.25rem;
}

nav.navbar {
    background: transparent;
    box-shadow:none;
    position: static;
    padding:0;
    display:flex;
    gap:1.5rem;
    flex-wrap:wrap;
    justify-content:center;
}

.navbar a {
    color: var(--clr-light);
    text-decoration: none;
    font-weight: 500;
    transition: color .2s;
}

.navbar a:hover {
    color: var(--clr-accent);
}

.cv-button {
    display: inline-block;
    padding: 0.75rem 1.25rem;
    background: var(--clr-light);
    color: var(--clr-primary);
    border-radius: 0.5rem;
    text-decoration: none;
    font-weight: 600;
    transition: background 0.2s ease, color 0.2s ease;
}

.cv-button:hover {
    background: var(--clr-accent);
    color:#fff;
}

#theme-toggle {
    position: fixed;
    bottom: 1rem;
    right: 2.5rem; /* posun od okraje */
    padding: 0.5rem 1rem;
    background: var(--clr-primary);
    color: #fff;
    border: none;
    border-radius: 0.5rem;
    cursor: pointer;
    z-index: 1000;
}

@keyframes fadeInDown {
    from {
        opacity:0;
        transform:translateY(-20px);
    } to {
        opacity:1;
        transform:translateY(0);
    }
}

main{
    width:100%;
    max-width:1000px;
    margin-inline:auto;
    padding:2rem 0;
    display:grid;
    gap:4rem;
}

section{
    display:flex;
    flex-direction:column;
    gap:1.5rem;
}
.section-title{
    font-size:1.75rem;
    color:var(--clr-primary);
    font-weight:600;
    border-left:6px solid var(--clr-accent);
    padding-left:.75rem;
}

/* ABOUT */
.about-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    align-items:center;
    gap:2rem;
}
.about-photo img{
    width:30%;
    aspect-ratio:1/1;
    object-fit:cover;
    border-radius:50%;
    box-shadow:0 4px 8px rgba(0,0,0,.1);
}

/* SKILLS */
.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    list-style: none;
    padding: 0;
}

.skill {
    background: #fff;
    padding: 1rem;
    text-align: center;
    border-radius: .75rem;
    box-shadow: 0 2px 6px rgba(0,0,0,.05);
    font-weight: 500;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;

    transition:transform .2s ease;
}

.skill:hover{
    transform:translateY(-4px)
}

.skill i {
    font-size: 2rem;
}

/* PROJECTS */
.projects-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
    gap:2rem;
}
.project-card{
    background:#fff;
    border-radius:.75rem;
    overflow:hidden;
    box-shadow:0 2px 8px rgba(0,0,0,.08);
    display:flex;
    flex-direction:column;
    transition:transform .2s ease;
}
.project-card:hover{
    transform:translateY(-4px)
}
.project-thumb{
    aspect-ratio:16/9;
    background:#ccc;

    display: flex;
    flex-wrap: wrap;
    align-items: flex-start;
    overflow: hidden;
    position: relative;
}

.column{
    flex: 50%;
    max-width: 50%;
    overflow: hidden;
    transform: translateY(-10%);
}

.column img {
  vertical-align: middle;
  width: 100%;
  object-fit: fill;
}

/*
.project-thumb img {
  width: 100%;
  object-fit: cover;
  display: block;
}


.top-left{ 
    grid-area: 1 / 1 / 3 / 2; 
}
.bottom-left{ 
    grid-area: 3 / 1 / 4 / 2; 
}
.top-right{ 
    grid-area: 1 / 2 / 2 / 3; 
}
.bottom-right{ 
    grid-area: 2 / 2 / 4 / 3; 
}
*/

.project-content{
    padding:1rem;
    display:flex;
    flex-direction:column;
    gap:.5rem
}
.project-title{
    font-weight:600
}

/* CERTIFICATES */
.cert-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
    gap:1.5rem;
}
.cert-card{
    background:#fff;
    padding:1rem;
    border-left:4px solid var(--clr-primary);
    border-radius:.5rem;
    box-shadow:0 1px 4px rgba(0,0,0,.05);

    transition:transform .2s ease;
}

.cert-card:hover{
    transform:translateY(-4px)
}

/* CONTACT */
.contact{
    display:grid;
    gap:1rem;
}
.contact a{
    color:var(--clr-primary);
    font-weight:500;
    text-decoration:none;
}
.contact a:hover{
    text-decoration:underline;
}

footer{
    margin-top:auto;
    background:var(--clr-primary-dark);
    color:#fff;
    text-align:center;
    padding:1.25rem 1rem;
    border-radius:1rem 1rem 0 0;
}