/* =========================================
   Základní proměnné a fonty
   ========================================= */
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;700&family=Space+Grotesk:wght@300;500;700&display=swap');

:root {
    --color-bg: #030303;
    --color-text: #f3f4f6;
    --color-text-muted: #888888;
    --color-accent: #ffffff;
    
    --color-glass: rgba(12, 12, 12, 0.65);
    --color-glass-border: rgba(255, 255, 255, 0.06);
    --color-glass-hover: rgba(25, 25, 25, 0.8);
    
    --font-main: 'Space Grotesk', sans-serif;
    --font-mono: 'JetBrains Mono', monospace;
    
    --transition-fast: 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Base dokumentu - Zabraňuje bílé čáře a přetečení */
html, body { 
    background-color: var(--color-bg);
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    scroll-behavior: smooth; 
}

/* Skrytý posuvník */
::-webkit-scrollbar { display: none; }
body {
    -ms-overflow-style: none;  
    scrollbar-width: none;  
    color: var(--color-text);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* =========================================
   3D Canvas & HUD
   ========================================= */
#webgl-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%; /* Fix proti bílé čáře z 100vw posuvníku */
    height: 100%;
    z-index: 0; 
    pointer-events: none; 
    outline: none;
    border: none;
}

#hud-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1; 
    pointer-events: none;
}

.hud-metric {
    position: absolute;
    color: #444444;
    font-family: var(--font-mono);
    font-size: 0.45rem; 
    letter-spacing: 0.15em;
    transform: scale(var(--scale, 1)) rotate(var(--rot, 0deg));
    transition: transform 0.1s ease-out;
}

.hud-metric span {
    color: #aaaaaa;
    font-weight: 700;
}

/* =========================================
   Hlavička a Navigace
   ========================================= */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem 5vw;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(3,3,3,0.9) 0%, rgba(3,3,3,0) 100%);
    pointer-events: auto;
}

.logo {
    font-family: var(--font-mono);
    font-size: 1.2rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    color: var(--color-accent);
    text-decoration: none;
}

.mobile-toggle {
    display: none;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 101;
    width: 32px;
    height: 32px;
    align-items: center;
    justify-content: center;
}

.grid-icon {
    position: relative;
    width: 22px;
    height: 22px;
}

.grid-icon span {
    position: absolute;
    width: 9px;
    height: 9px;
    background-color: var(--color-accent);
    border-radius: 3px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.grid-icon span:nth-child(1) { top: 0; left: 0; }
.grid-icon span:nth-child(2) { top: 0; right: 0; }
.grid-icon span:nth-child(3) { bottom: 0; left: 0; }
.grid-icon span:nth-child(4) { bottom: 0; right: 0; }

.mobile-toggle.active .grid-icon span:nth-child(1) {
    width: 28px; height: 2px;
    top: 10px; left: -3px;
    transform: rotate(45deg);
    border-radius: 1px;
}
.mobile-toggle.active .grid-icon span:nth-child(4) {
    width: 28px; height: 2px;
    bottom: 10px; right: -3px;
    transform: rotate(-45deg);
    border-radius: 1px;
}
.mobile-toggle.active .grid-icon span:nth-child(2),
.mobile-toggle.active .grid-icon span:nth-child(3) {
    opacity: 0;
    transform: scale(0);
}

.nav-links { display: flex; gap: 2.5rem; }

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: var(--transition-fast);
}

.nav-links a:hover { color: var(--color-accent); }

/* =========================================
   Sekce a Typografie
   ========================================= */
.ui-layer {
    position: relative;
    z-index: 10;
    pointer-events: none; 
}

section {
    min-height: 100vh;
    padding: 8rem 5vw; 
    display: flex;
    flex-direction: column;
    justify-content: center;
    pointer-events: none;
}

.hero-section {
    position: relative; 
    align-items: flex-start;
}

.content-block, .projects-container {
    pointer-events: auto;
    width: 100%;
}

.content-block { max-width: 650px; }
.hero-block { max-width: 950px; }

.section-tag {
    display: block;
    font-family: var(--font-mono);
    color: var(--color-text-muted);
    font-size: 1.1rem; 
    font-weight: 700;
    margin-bottom: 1.5rem;
    letter-spacing: 0.1em;
}

h1 {
    font-size: clamp(3.5rem, 8vw, 6.5rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1rem;
}

p {
    font-size: clamp(1rem, 1.2vw, 1.15rem);
    color: var(--color-text-muted);
    font-weight: 300;
    max-width: 800px;
}

/* =========================================
   SCROLL CTA (Myška)
   ========================================= */
.scroll-indicator {
    position: absolute;
    bottom: 5vh;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    opacity: 1; 
    transition: opacity 0.1s;
}

.mouse {
    width: 20px;
    height: 32px;
    border: 2px solid var(--color-text-muted);
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 4px;
    background: var(--color-accent);
    border-radius: 50%;
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% { transform: translate(-50%, 0); opacity: 1; }
    100% { transform: translate(-50%, 12px); opacity: 0; }
}

/* =========================================
   Gridy a Karty
   ========================================= */
.section-header { margin-bottom: 4rem; }

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    pointer-events: auto;
}

.glass-panel {
    background: var(--color-glass);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--color-glass-border);
    padding: 2.5rem;
    border-radius: 4px;
    transition: var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    background: var(--color-glass-hover);
    border-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.project-meta {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    letter-spacing: 0.05em;
}

.glass-panel h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.glass-panel p {
    font-size: 0.95rem;
    margin-bottom: 2rem;
    flex-grow: 1; 
}

.tech-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }

.tech-tags span {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    padding: 0.25rem 0.6rem;
    border: 1px solid var(--color-glass-border);
    border-radius: 2px;
    color: var(--color-text-muted);
    text-transform: uppercase;
}

/* =========================================
   Kontakt - Plynulý přechod do plné černé
   ========================================= */
.contact-section {
    position: relative;
    background: linear-gradient(to bottom, transparent 0%, rgba(3,3,3,0.8) 25%, #030303 45%, #030303 100%);
    padding-top: 10rem;
    min-height: auto; 
    padding-bottom: 0;
    margin-top: -5rem; 
    display: flex;
    flex-direction: column;
    justify-content: center;
}

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

.form-wrapper {
    background: transparent;
    padding: 0;
    max-width: 850px; 
    margin: 0 auto;
}

form {
    margin-top: 3rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.full-width {
    grid-column: 1 / -1;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

label {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    text-transform: uppercase;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

input, textarea {
    background: transparent;
    border: none;
    border-bottom: 2px solid rgba(255, 255, 255, 0.4); 
    color: var(--color-accent);
    font-family: var(--font-main);
    font-size: 1.2rem; 
    padding: 0.75rem 0;
    transition: var(--transition-fast);
    resize: none;
}

input:focus, textarea:focus {
    outline: none;
    border-bottom-color: var(--color-accent);
}

input::placeholder, textarea::placeholder {
    color: rgba(255, 255, 255, 0.2);
}

.submit-btn {
    background: var(--color-accent);
    color: var(--color-bg);
    border: none;
    padding: 1.2rem 3rem;
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    cursor: pointer;
    transition: var(--transition-fast);
    align-self: flex-start; 
    margin-top: 1rem;
}

.submit-btn:hover { background: #dddddd; }
.submit-btn:active { transform: scale(0.98); }

/* =========================================
   Copyrights & Fix Odskoku
   ========================================= */
.copyrights {
    text-align: center;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 5rem;
    padding-bottom: 2rem; 
    letter-spacing: 0.05em;
    position: relative;
    z-index: 2;
    background-color: #030303;
    /* Bezpečný stín pouze SMĚREM DOLŮ - zamezí mřížce u overscrollu */
    box-shadow: 0 50vh 0 0 #030303;
}

/* =========================================
   SCROLL TO TOP BUTTON
   ========================================= */
#scroll-to-top {
    position: fixed;
    bottom: 40px;
    right: 40px;
    width: 50px;
    height: 50px;
    background: var(--color-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--color-glass-border);
    border-radius: 4px;
    color: var(--color-accent);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 99;
    opacity: 0;
    pointer-events: none;
    transform: translateY(20px);
    transition: all 0.3s ease;
}

#scroll-to-top.visible {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
}

#scroll-to-top:hover {
    background: var(--color-glass-hover);
    border-color: rgba(255, 255, 255, 0.3);
}

#scroll-to-top svg { width: 24px; height: 24px; }

/* =========================================
   Responzivita & Mobilní Menuu
   ========================================= */
@media (max-width: 768px) {
    .mobile-toggle { display: flex; }

    .mobile-toggle.active span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
    .mobile-toggle.active span:nth-child(2) { opacity: 0; }
    .mobile-toggle.active span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

    .nav-links { 
        position: fixed; top: 0; right: -100%;
        width: 100%; height: 100vh;
        background: rgba(3, 3, 3, 0.98);
        flex-direction: column; justify-content: center; align-items: center;
        transition: right 0.3s ease;
    }

    .nav-links.active { right: 0; }
    .nav-links a { font-size: 1.5rem; }

    .scroll-indicator { display: none; }
    
    section { padding: 4rem 5vw; min-height: auto; }
    
    .hero-section {
        min-height: 100vh; padding-top: 100px; justify-content: center; 
    }
    
    h1 { font-size: clamp(2.5rem, 10vw, 4rem); }
    .glass-panel { padding: 1.5rem; }
    .form-grid { grid-template-columns: 1fr; gap: 1.5rem; }
    
    #scroll-to-top {
        bottom: 20px; right: 20px; width: 45px; height: 45px;
    }
}