/* ============================================
   RESET A ZÁKLADNÍ STYLY
   ============================================ */

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

:root {
    --black: #000000;
    --white: #FFFFFF;
    --gray: #999999;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
}

body {
    font-family: Arial, Helvetica, sans-serif;
    background: var(--black) !important;
    color: var(--white);
    line-height: 1.6;
    overflow-x: hidden;
}

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


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

nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 2rem 0;
    mix-blend-mode: difference;
}

.nav-container {
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: block;
    line-height: 0;
}

.logo img {
    display: block;
    filter: invert(1);
}

.nav-links {
    display: flex;
    gap: 3rem;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.85rem;
    letter-spacing: 2px;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 0.5;
}

.menu-toggle {
    display: none;
    width: 30px;
    height: 24px;
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
}

.menu-toggle span {
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--white);
    border-radius: 10px;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

.menu-toggle span:nth-child(1) { top: 0; }
.menu-toggle span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.menu-toggle span:nth-child(3) { bottom: 0; }

.menu-toggle.active span:nth-child(1) {
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    transform: translateY(-50%) scaleX(0);
}

.menu-toggle.active span:nth-child(3) {
    bottom: 50%;
    transform: translateY(50%) rotate(-45deg);
}


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

section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 3rem;
    scroll-margin-top: 80px;
    position: relative;
}

.container {
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

.section-label {
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 3px;
    margin-bottom: 2rem;
    opacity: 0.5;
}

.section-title {
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 900;
    line-height: 0.9;
    letter-spacing: -0.04em;
    margin-bottom: 4rem;
}


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

.hero {
    padding-top: 12rem;
    position: relative;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
}

.hero h1 {
    font-size: clamp(4rem, 12vw, 10rem);
    font-weight: 900;
    line-height: 0.85;
    letter-spacing: -0.05em;
    margin-bottom: 2rem;
}

.hero-number {
    font-size: clamp(8rem, 20vw, 18rem);
    font-weight: 900;
    line-height: 1;
    text-align: right;
}

.hero p {
    font-size: 1.1rem;
    line-height: 1.8;
    max-width: 500px;
    color: var(--gray);
    margin-bottom: 3rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 1rem 2.5rem;
    font-size: 0.85rem;
    font-weight: 900;
    text-decoration: none;
    border: 2px solid var(--white);
    cursor: pointer;
    letter-spacing: 2px;
    position: relative;
    overflow: hidden;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: all 0.4s ease;
    background: transparent;
    color: var(--white);
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: var(--white);
    transition: all 0.5s ease;
    transform: translate(-50%, -50%);
}

.btn:hover::before {
    width: 120%;
    height: 120%;
}

.btn:hover {
    color: var(--black);
}

.btn span {
    position: relative;
    z-index: 1;
}


/* ============================================
   SEKCE O MNĚ
   ============================================ */

.about {
    background: var(--white);
    color: var(--black);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1px;
    background: var(--black);
    margin-top: 4rem;
}

.about-item {
    background: var(--white);
    padding: 4rem 3rem;
    transition: all 0.4s ease;
    cursor: pointer;
}

.about-item:hover {
    background: var(--black);
    color: var(--white);
    transform: scale(1.05);
    z-index: 10;
}

.icon {
    font-size: 3rem;
    margin-bottom: 2rem;
    opacity: 0.3;
}

.icon img {
    display: block;
}

.about-item:hover .icon {
    filter: invert(1);
}

.about-item h3 {
    font-size: 1.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
    letter-spacing: -0.5px;
}

.about-item p {
    font-size: 0.95rem;
    line-height: 1.8;
    opacity: 0.7;
}

.about-item:hover p {
    opacity: 1;
}


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

.services {
    background: var(--black);
}

.services-list {
    margin-top: 6rem;
}

.service-item {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding: 3rem 0;
    display: grid;
    grid-template-columns: 100px 1fr 200px;
    gap: 4rem;
    align-items: center;
    cursor: pointer;
    transition: all 0.4s ease;
}

.service-item:hover {
    padding-left: 2rem;
    border-color: var(--white);
}

.service-number {
    font-size: 2rem;
    font-weight: 900;
    opacity: 0.3;
}

.service-item h3 {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -1px;
}

.service-item p {
    font-size: 0.9rem;
    color: var(--gray);
    text-align: right;
}


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

.portfolio {
    background: var(--white);
    color: var(--black);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1px;
    background: var(--black);
    margin-top: 4rem;
}

.portfolio-item {
    aspect-ratio: 1;
    background: var(--white);
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.portfolio-bg {
    position: absolute;
    inset: 0;
    background: var(--black);
    transform: scale(0);
    transition: transform 0.6s cubic-bezier(0.76, 0, 0.24, 1);
}

.portfolio-item:hover .portfolio-bg {
    transform: scale(1);
}

.portfolio-content {
    position: absolute;
    inset: 3rem;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    z-index: 1;
    transition: color 0.4s ease;
}

.portfolio-item:hover .portfolio-content {
    color: var(--white);
}

.portfolio-number {
    font-size: 6rem;
    font-weight: 900;
    line-height: 1;
    opacity: 0.1;
    margin-bottom: 2rem;
}

.portfolio-content h3 {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 0.5rem;
    letter-spacing: -1px;
}

.portfolio-content p {
    font-size: 0.9rem;
    opacity: 0.7;
    letter-spacing: 1px;
}


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

.contact {
    background: var(--black);
    text-align: center;
    padding: 15rem 3rem;
}

.contact .section-title {
    color: var(--white);
    margin-bottom: 4rem;
}

.contact-email {
    display: inline-block;
    font-size: clamp(2rem, 5vw, 4rem);
    font-weight: 300;
    color: var(--white);
    text-decoration: none;
    letter-spacing: -2px;
    padding-bottom: 0.5rem;
    transition: all 1.2s ease;
}

.contact-email:hover {
    color: var(--gray);
    border-color: var(--gray);
    letter-spacing: 7px;
    font-weight: 900;
}


/* ============================================
   PATIČKA
   ============================================ */

footer {
    background: var(--black);
    padding: 4rem 3rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer-container {
    max-width: 1600px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.footer-info h4 {
    font-size: 0.8rem;
    font-weight: 900;
    letter-spacing: 3px;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    text-align: right;
}

.footer-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 900;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
    transition: opacity 0.3s;
}

.footer-links a:hover {
    opacity: 0.5;
}