/* ==========================================================================
   BASE STYLES - Společné styly pro všechny stránky
   ========================================================================== */

:root {
    /* Neonová paleta barev */
    --neon-blue: #00D4FF;
    --neon-purple: #8B5CF6;
    --neon-pink: #F441A5;
    --neon-green: #10B981;
    --neon-orange: #F97316;
    
    /* Tmavé odstíny */
    --dark-bg: #0F0F0F;
    --dark-surface: #1A1A1A;
    --dark-surface-2: #262626;
    --dark-border: #333333;
    --dark-text: #E5E5E5;
    --dark-text-secondary: #A3A3A3;
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: rgba(0, 0, 0, 0.25);
    
    /* Animace */
    --transition-fast: 0.2s ease-out;
    --transition-normal: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
    --bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* Rozměry */
    --header-height: 80px;
    --sidebar-width: 280px;
    --border-radius: 12px;
    --border-radius-large: 20px;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--dark-bg);
    color: var(--dark-text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: 0.5em;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--dark-text-secondary);
}

a {
    color: var(--neon-blue);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--neon-pink);
    text-shadow: 0 0 10px var(--neon-pink);
}

/* Navigation Base */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    height: var(--header-height);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--dark-text);
    transition: var(--transition-normal);
}

.nav-logo:hover {
    color: var(--neon-blue);
    transform: scale(1.05);
}

.logo-img {
    width: 48px;
    height: 48px;
    filter: brightness(0) invert(1);
    transition: var(--transition-normal);
}

.nav-logo:hover .logo-img {
    filter: brightness(0) invert(1) drop-shadow(0 0 10px var(--neon-blue));
    transform: rotate(5deg);
}

.logo-text {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-size: 200% 200%;
    animation: gradientShift 3s ease-in-out infinite;
}

@keyframes gradientShift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--neon-blue), var(--neon-purple));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 212, 255, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--dark-text);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--neon-blue);
    color: var(--neon-blue);
}

/* Cards */
.card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius-large);
    padding: 2rem;
    box-shadow: 0 8px 32px var(--glass-shadow);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple), var(--neon-pink));
    opacity: 0;
    transition: var(--transition-normal);
}

.card:hover::before {
    opacity: 1;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px var(--glass-shadow);
    border-color: rgba(0, 212, 255, 0.3);
}

/* Form Elements */
.input-group {
    position: relative;
    margin-bottom: 1.5rem;
}

.input-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--dark-text-secondary);
    font-size: 0.9rem;
}

.input-group input,
.input-group textarea,
.input-group select {
    width: 100%;
    padding: 1rem;
    background: var(--dark-surface);
    border: 2px solid var(--dark-border);
    border-radius: var(--border-radius);
    color: var(--dark-text);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.input-group input:focus,
.input-group textarea:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--neon-blue);
    box-shadow: 0 0 0 3px rgba(0, 212, 255, 0.1);
    background: var(--dark-surface-2);
}

.input-line {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-blue), var(--neon-purple));
    transition: width var(--transition-normal);
}

.input-group input:focus + .input-line {
    width: 100%;
}

/* Loading Animations */
.pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.bounce {
    animation: bounce 1s var(--bounce) infinite;
}

@keyframes bounce {
    0%, 20%, 53%, 80%, 100% { transform: translate3d(0, 0, 0); }
    40%, 43% { transform: translate3d(0, -30px, 0); }
    70% { transform: translate3d(0, -15px, 0); }
    90% { transform: translate3d(0, -4px, 0); }
}

/* Floating Elements */
.floating-elements {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.floating-shape {
    position: absolute;
    border-radius: 50%;
    opacity: 0.1;
    animation: float 20s infinite linear;
}

.shape-1 {
    width: 100px;
    height: 100px;
    background: var(--neon-blue);
    top: 20%;
    left: 10%;
    animation-duration: 25s;
}

.shape-2 {
    width: 60px;
    height: 60px;
    background: var(--neon-purple);
    top: 60%;
    right: 20%;
    animation-duration: 30s;
    animation-direction: reverse;
}

.shape-3 {
    width: 80px;
    height: 80px;
    background: var(--neon-pink);
    bottom: 30%;
    left: 30%;
    animation-duration: 35s;
}

.shape-4 {
    width: 120px;
    height: 120px;
    background: var(--neon-green);
    top: 40%;
    right: 10%;
    animation-duration: 40s;
    animation-direction: reverse;
}

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
    100% { transform: translate(0, 0) rotate(360deg); }
}

/* Responsive Design */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
        --sidebar-width: 100%;
    }
    
    .nav-container {
        padding: 0 1rem;
    }
    
    .nav-logo {
        font-size: 1.25rem;
    }
    
    .logo-img {
        width: 36px;
        height: 36px;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.5rem; }
    
    .card {
        padding: 1.5rem;
    }
    
    .btn {
        padding: 0.6rem 1.2rem;
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    
    .card {
        padding: 1rem;
    }
    
    .floating-shape {
        display: none;
    }
}