:root {
    --bg-deep: #0b0a14;
    --glass: rgba(255, 255, 255, 0.015);
    --glass-strong: rgba(255, 255, 255, 0.035);
    --glass-border: rgba(255, 255, 255, 0.12);
    --glass-blur: blur(2px) saturate(1.35);
    --accent: #b3a4e8;
    --accent-dim: rgba(179, 164, 232, 0.16);
    --text: #f2f5f3;
    --muted: rgba(242, 245, 243, 0.62);
    --radius: 18px;
    --font-ui: "Space Grotesk", system-ui, sans-serif;
    --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

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

body {
    min-height: 100vh;
    min-height: 100svh;
    font-family: var(--font-ui);
    color: var(--text);
    background:
        linear-gradient(160deg, rgba(28, 16, 58, 0.5), rgba(14, 9, 34, 0.66)),
        url("background.png") center / cover no-repeat fixed,
        var(--bg-deep);
}

/* ===== Sprachumschalter ===== */
.lang-switch {
    transition: opacity 0.28s ease, color 0.2s, background 0.2s;
    position: fixed;
    top: 18px;
    right: 18px;
    z-index: 30;
    display: flex;
    padding: 4px;
    border-radius: 999px;
    overflow: hidden;
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transform: translateZ(0);
}

.lang-switch button {
    border: none;
    background: transparent;
    color: var(--muted);
    font: 600 0.85rem var(--font-ui);
    letter-spacing: 0.06em;
    padding: 0.45rem 0.9rem;
    border-radius: 999px;
    cursor: pointer;
    transition: color 0.2s, background 0.2s;
}

.lang-switch button:hover { color: var(--text); }

.lang-switch button[aria-pressed="true"] {
    background: var(--accent-dim);
    color: var(--accent);
}

/* ===== Layout ===== */
.stage {
    min-height: 100vh;
    min-height: 100svh;
    transition: opacity 0.28s ease;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: clamp(1.3rem, 3.5vh, 2.2rem);
    padding: clamp(4rem, 10vh, 5rem) 1.2rem clamp(1.5rem, 5vh, 3rem);
    text-align: center;
}

.eyebrow {
    font: 700 0.8rem var(--font-mono);
    letter-spacing: 0.35em;
    text-transform: uppercase;
    color: var(--accent);
    margin-bottom: 0.9rem;
}

.hero h1 {
    text-shadow: 0 2px 18px rgba(0, 0, 0, 0.55);
    font-size: clamp(2rem, 5.5vw, 3.4rem);
    font-weight: 700;
    letter-spacing: -0.02em;
    line-height: 1.1;
    max-width: 16ch;
    margin-inline: auto;
}

.subtitle {
    text-shadow: 0 1px 12px rgba(0, 0, 0, 0.55);
    margin-top: 0.8rem;
    font-size: 1.05rem;
    color: var(--muted);
}

.ip-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    padding: clamp(1.4rem, 4vw, 1.8rem) clamp(1.2rem, 5vw, 2.4rem);
    border-radius: var(--radius);
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    transform: translateZ(0);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.22);
    max-width: min(92vw, 460px);
    width: 100%;
}

.ip-label {
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--muted);
}

.ip-line {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    font: 700 clamp(1.15rem, 4vw, 1.5rem) var(--font-mono);
    color: var(--accent);
    word-break: break-all;
    background: none;
    border: none;
    padding: 0.2rem 0.4rem;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s;
}

.ip-line:hover { background: var(--accent-dim); }
.ip-line:active { transform: scale(0.98); }

.ip-hint {
    min-height: 1.1em;
    font-size: 0.82rem;
    color: var(--accent);
    opacity: 0;
    transition: opacity 0.2s;
}

.ip-card.copied .ip-hint { opacity: 1; }

.prompt { color: var(--muted); font-weight: 400; }

.cursor {
    width: 0.6em;
    height: 1.15em;
    background: var(--accent);
    animation: blink 1.1s steps(1) infinite;
}

@keyframes blink { 50% { opacity: 0; } }

/* ===== Buttons ===== */
.btn {
    font: 600 0.95rem var(--font-ui);
    padding: 0.75rem 1.6rem;
    border-radius: 12px;
    cursor: pointer;
    transition: transform 0.15s, background 0.2s, color 0.2s, border-color 0.2s;
}

.btn:active { transform: translateZ(0) scale(0.97); }

.btn-ghost {
    background: var(--glass-strong);
    border: 1px solid var(--glass-border);
    color: var(--text);
    overflow: hidden;
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}

.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

body.rules-open .stage {
    opacity: 0;
    pointer-events: none;
}

.rules-panel[hidden] { display: none; }

.rules-panel {
    position: fixed;
    inset: 0;
    z-index: 20;
    display: grid;
    place-items: center;
    padding: 1.2rem;
    background: transparent;
    opacity: 0;
    transition: opacity 0.28s ease;
}

.rules-panel.open { opacity: 1; }

.rules-card {
    position: relative;
    width: min(100%, 560px);
    padding: 2.4rem 2.2rem;
    border-radius: var(--radius);
    background: var(--glass);
    border: 1px solid var(--glass-border);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    transform: translateY(18px) scale(0.97);
    transition: transform 0.28s cubic-bezier(0.2, 0.8, 0.3, 1);
}

.rules-panel.open .rules-card { transform: none; }

.rules-card h2 {
    font-size: 1.5rem;
    margin-bottom: 1.4rem;
    letter-spacing: -0.01em;
}

.rules-list {
    list-style: none;
    counter-reset: rule;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    text-align: left;
}

.rules-list li {
    counter-increment: rule;
    display: flex;
    align-items: baseline;
    gap: 0.9rem;
    font-size: 1.02rem;
    color: var(--text);
}

.rules-list li::before {
    content: counter(rule, decimal-leading-zero);
    font: 700 0.85rem var(--font-mono);
    color: var(--accent);
    flex-shrink: 0;
}

.rules-close {
    position: absolute;
    top: 12px;
    right: 16px;
    border: none;
    background: transparent;
    color: var(--muted);
    font-size: 1.8rem;
    line-height: 1;
    cursor: pointer;
    transition: color 0.2s;
}

.rules-close:hover { color: var(--text); }

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
    border-radius: 6px;
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        transition: none !important;
    }
    *:not(.cursor), *::before, *::after {
        animation: none !important;
    }
}

@media (max-width: 640px) {
    body {
        background-attachment: scroll, scroll;
    }

    .lang-switch {
        top: 14px;
        right: auto;
        left: 50%;
        transform: translateX(-50%) translateZ(0);
    }
    .lang-switch button { padding: 0.55rem 1.2rem; font-size: 0.95rem; }

    .hero h1 { font-size: clamp(1.6rem, 7.5vw, 2.2rem); }
    .subtitle { font-size: 0.95rem; }

    .ip-line { font-size: clamp(1rem, 5.5vw, 1.3rem); }

    .rules-panel {
        place-items: end center;
        padding: 0;
    }

    .rules-card {
        width: 100%;
        max-height: 85svh;
        overflow-y: auto;
        border-radius: var(--radius) var(--radius) 0 0;
        padding: 1.8rem 1.4rem calc(1.8rem + env(safe-area-inset-bottom));
        transform: translateY(100%);
    }

    .rules-panel.open .rules-card { transform: none; }
}