:root {
    --color-bg: #0f172a;
    --color-card: #1e293b;
    --color-text: #94a3b8;
    --color-heading: #f1f5f9;
    --color-accent-blue: 59, 130, 246;
    --color-accent-teal: 20, 184, 166;
    --color-accent-green: 34, 197, 94;
    --color-accent-purple: 139, 92, 246;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-height: 100vh;
    font-family: system-ui, -apple-system, Segoe UI, sans-serif;
    color: var(--color-text);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    background: var(--color-bg);
    -webkit-user-select: none;  /* Chrome, Safari */
    -moz-user-select: none;     /* Firefox */
    -ms-user-select: none;      /* IE/Edge */
    user-select: none;          /* Standard */
}

.container::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 120%;
    height: 120%;
    background: radial-gradient(circle at 30% 30%, rgba(59,130,246,0.3), transparent 70%),
                radial-gradient(circle at 70% 70%, rgba(34,197,94,0.2), transparent 60%);
    z-index: -1;
    pointer-events: none;
    animation: float 25s ease-in-out infinite alternate;
}

@keyframes float {
    0%   { transform: translate(0,0) rotate(0deg); }
    25%  { transform: translate(20px,-10px) rotate(45deg); }
    50%  { transform: translate(-15px,15px) rotate(90deg); }
    75%  { transform: translate(10px,-20px) rotate(135deg); }
    100% { transform: translate(0,0) rotate(180deg); }
}

body::after {
    content: '';
    position: fixed;
    width: 900px;
    height: 900px;
    top: 50%;
    left: 50%;
    background: linear-gradient(135deg, rgba(var(--color-accent-blue),0.35), rgba(var(--color-accent-purple),0.25), rgba(var(--color-accent-green),0.35));
    filter: blur(200px);
    transform: translate(-50%, -50%);
    opacity: 0.6;
    animation: float 40s linear infinite;
    z-index: -1;
}

@keyframes float {
    0%, 100% { transform: translate(-50%, -50%) rotate(0deg); }
    50% { transform: translate(-50%, -50%) rotate(360deg); }
}

.card {
    background: var(--color-card);
    padding: 3rem 3.5rem;
    border-radius: 18px;
    box-shadow: 0 30px 80px rgba(0,0,0,.4);
    max-width: 800px;
    width: 90%;
    text-align: center;
    animation: fadeIn .8s ease-out;
}

h1 {
    margin: 1rem 0;
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-heading);
    word-break: break-word;
}

p {
    margin: 0 0 2rem;
    font-size: 1.1rem;
    color: var(--color-text);
    word-break: break-word;
}

.badge {
    display: inline-block;
    padding: .5rem 1rem;
    border-radius: 999px;
    background: linear-gradient(135deg, rgba(var(--color-accent-blue),0.25), rgba(var(--color-accent-teal),0.25));
    color: rgb(var(--color-accent-blue));
    font-size: .9rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
    position: relative;
    animation: pulse 2s infinite;
    transition: all 0.3s ease;
}

.badge:hover {
    background: linear-gradient(135deg, rgba(var(--color-accent-blue),0.35), rgba(var(--color-accent-teal),0.35));
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 20px rgba(0,0,0,0.5);
}

@keyframes pulse {
    0%, 100% { transform: translateY(0) scale(1); opacity: 0.9; }
    50% { transform: translateY(-2px) scale(1.05); opacity: 1; }
}

footer {
    border-top: 1px solid rgba(59,130,246,0.3);
    text-align: center;
    padding-top: 1rem;
    background: linear-gradient(90deg, #3b82f6, #14b8a6, #22c55e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: none; }
}

.loading {
    margin-top: 1rem;
    font-size: 1rem;
    color: var(--color-text);
    font-style: italic;
    display: inline-block;
}

.loading-bar {
    position: relative;
    width: 100%;
    height: 8px;
    background: rgba(var(--color-accent-blue),0.15);
    border-radius: 999px;
    overflow: hidden;
    margin: 1rem 0 0 0;
}

.loading-bar .progress {
    position: absolute;
    height: 100%;
    width: 30%;
    background: linear-gradient(135deg, rgba(var(--color-accent-blue),0.6), rgba(var(--color-accent-teal),0.6));
    border-radius: 999px;
    animation: loading 1.5s ease-in-out infinite;
}

@keyframes loading {
    0% { left: -30%; }
    50% { left: 50%; }
    100% { left: 100%; }
}

@media (max-width: 768px) {
    .card { padding: 2rem 2.5rem; }
    h1 { font-size: 1.5rem; }
    p { font-size: 1rem; }
    .badge { font-size: .8rem; padding: .4rem .8rem; }
    .loading-bar { height: 6px; }
}

@media (max-width: 480px) {
    .card { padding: 1.5rem 2rem; }
    h1 { font-size: 1.3rem; }
    p { font-size: 0.95rem; }
    .badge { font-size: .75rem; padding: .3rem .7rem; }
    .loading-bar { height: 5px; }
}

.lang-switch {
    position: absolute;
    top: 1rem;
    right: 1rem;
    display: flex;
    gap: .4rem;
}

.lang-btn {
    padding: .4rem .8rem;
    border-radius: 999px;
    background: linear-gradient(
        135deg,
        rgba(var(--color-accent-blue), 0.25),
        rgba(var(--color-accent-teal), 0.25)
    );
    color: rgb(var(--color-accent-blue));
    border: none;
    font-size: .75rem;
    font-weight: 600;
    letter-spacing: .05em;
    text-transform: uppercase;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(0,0,0,.3);
    transition: all .25s ease;
}

.lang-btn:hover {
    background: linear-gradient(
        135deg,
        rgba(var(--color-accent-blue), 0.35),
        rgba(var(--color-accent-teal), 0.35)
    );
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 6px 20px rgba(0,0,0,.5);
}

/* aktivní jazyk */
.lang-btn.active {
    background: linear-gradient(
        135deg,
        rgba(var(--color-accent-blue), 0.6),
        rgba(var(--color-accent-teal), 0.6)
    );
    color: #fff;
    box-shadow: 0 0 20px rgba(var(--color-accent-blue), .6);
}