/**
 * @file    public_html/css/style.css
 * @purpose Stylesheet for testxan — layout, typografi og ballon-animation
 * @uses    Ingen
 * @usedby  public_html/index.html
 * @updated run#6 — Tilføjet .balloon styling, keyframes, overflow-x fix, prefers-reduced-motion
 */

/* testxan — Stylesheet v0.2.0 */

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

:root {
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --max-width: 960px;
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
}

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: var(--font-family);
    background-color: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    overflow-x: hidden; /* Forhindrer horisontal scrollbar fra ballonens sway */
}

.container {
    width: 100%;
    max-width: var(--max-width);
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    position: relative;
    z-index: 1; /* Sikrer indhold renderes over ballonen */
}

.header {
    text-align: center;
    padding: var(--spacing-xl) 0 var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
    margin-bottom: var(--spacing-lg);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.header .version {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    font-weight: 500;
}

.main {
    flex: 1;
}

.welcome {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow);
}

.welcome h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.welcome p {
    color: var(--color-text-muted);
}

.footer {
    text-align: center;
    padding: var(--spacing-lg) 0 var(--spacing-md);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-lg);
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ==========================================================================
   Animeret blå ballon — dekorativt element
   
   Rendering: Ren CSS — oval krop med radial gradient, ::after for knude,
   ::before for snor. GPU-accelereret via transform-only animation.
   ========================================================================== */

.balloon {
    position: fixed;
    left: 15%;
    bottom: 0;
    z-index: 0; /* Bag alt sidens indhold */
    pointer-events: none; /* Blokerer ikke klik */
    width: clamp(40px, 5vw, 60px);
    height: clamp(48px, 6vw, 72px);
    border-radius: 50% 50% 50% 50% / 40% 40% 60% 60%; /* Oval ballonform — bredere top, smallere bund */
    background: radial-gradient(circle at 35% 30%, #93bbfd, #60a5fa 30%, var(--color-primary) 65%, var(--color-primary-dark));
    box-shadow: inset -4px -4px 8px rgba(0, 0, 0, 0.12), 0 2px 8px rgba(37, 99, 235, 0.25);
    animation:
        balloon-float 12s ease-in-out infinite,
        balloon-sway 3s ease-in-out infinite;
    will-change: transform;
}

/* Knude i bunden af ballonen */
.balloon::after {
    content: "";
    position: absolute;
    bottom: -6px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-top: 8px solid var(--color-primary-dark);
}

/* Snor hængende ned fra ballonen */
.balloon::before {
    content: "";
    position: absolute;
    bottom: -55px;
    left: 50%;
    transform: translateX(-50%);
    width: 1.5px;
    height: 48px;
    background: linear-gradient(to bottom, var(--color-primary-dark), #94a3b8);
    border-radius: 1px;
    opacity: 0.7;
}

/* Primær animation: lodret bevægelse bund → top med let X-forskydning */
@keyframes balloon-float {
    0% {
        transform: translateY(0) translateX(0);
        /* Startposition: bunden af viewport (CSS fixed + bottom:0) */
    }
    25% {
        transform: translateY(-30vh) translateX(15px);
    }
    50% {
        transform: translateY(-60vh) translateX(25px);
    }
    75% {
        transform: translateY(-90vh) translateX(10px);
    }
    100% {
        transform: translateY(-120vh) translateX(0);
        /* Forsvinder over viewport — genstartes af infinite loop */
    }
}

/* Sekundær animation: let gyngende rotation for realisme */
@keyframes balloon-sway {
    0%, 100% {
        rotate: -3deg;
    }
    50% {
        rotate: 3deg;
    }
}

/* Tilgængelighed: respektér brugerens motion-præference */
@media (prefers-reduced-motion: reduce) {
    .balloon {
        animation: none;
        display: none;
    }
}