/* KoalaSync Design System - Privacy-Focused (No External Assets) */

:root {
    --bg: #0f172a;
    --card: #1e293b;
    --accent: #6366f1;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --text: #f8fafc;
    --text-muted: #94a3b8;
    --success: #22c55e;
    --glass: rgba(30, 41, 59, 0.4);
    --glass-border: rgba(255, 255, 255, 0.05);
}

.invite-banner {
    background: var(--accent);
    color: white;
    padding: 0.75rem 0;
    text-align: center;
    font-weight: 600;
    font-size: 0.9rem;
    position: relative;
    z-index: 2000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.btn-banner {
    background: white;
    color: var(--accent);
    padding: 4px 12px;
    border-radius: 6px;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 700;
    margin-left: 12px;
    cursor: pointer;
    border: none;
    transition: transform 0.2s;
}

.btn-banner:hover {
    transform: scale(1.05);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

/* --- Animated Background --- */
.bg-blobs {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: radial-gradient(circle at 50% 50%, #1e1b4b 0%, #0f172a 100%);
}

.blob {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
    filter: blur(80px);
    border-radius: 50%;
    opacity: 0.5;
    animation: move 25s infinite alternate ease-in-out;
}

.blob-1 { top: -100px; left: -100px; animation-delay: 0s; }
.blob-2 { bottom: -100px; right: -100px; animation-delay: -5s; background: radial-gradient(circle, rgba(139, 92, 246, 0.2) 0%, transparent 70%); }
.blob-3 { top: 40%; left: 30%; animation-duration: 35s; animation-delay: -10s; }

@keyframes move {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(100px, 100px) scale(1.2); }
    66% { transform: translate(-50px, 200px) scale(0.8); }
    100% { transform: translate(0, 0) scale(1); }
}

/* --- Layout --- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

/* --- Navigation --- */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 1rem 0;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-weight: 800;
    font-size: 1.5rem;
    letter-spacing: -0.5px;
}

.logo-area img {
    height: 40px;
    width: 40px;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

/* --- Hero Section --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 8rem;
    text-align: center;
}

.hero-grid {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.hero-text h1 {
    font-size: 5rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 1.5rem;
    background: linear-gradient(to bottom, #fff 30%, #6366f1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text p, .hero-subtitle {
    font-size: 1.5rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    font-weight: 400;
}

.cta-group {
    display: flex;
    gap: 1rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--accent);
    color: white;
    box-shadow: 0 10px 15px -3px var(--accent-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 20px 25px -5px var(--accent-glow);
}

.btn-secondary {
    background: var(--card);
    color: var(--text);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: #2d3748;
    transform: translateY(-2px);
}

.version-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent);
    padding: 0.5rem 1.25rem;
    border-radius: 99px;
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(99, 102, 241, 0.3);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}


.hero-image {
    display: none;
}

/* --- Features --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.feature-card {
    background: var(--card);
    padding: 2.5rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-icon {
    width: 48px;
    height: 48px;
    background: var(--accent-glow);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

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

/* --- How it works --- */
.steps {
    display: flex;
    flex-direction: column;
    gap: 4rem;
}

.step {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.step:nth-child(even) .step-text {
    order: 2;
}

.step-num {
    font-size: 5rem;
    font-weight: 800;
    color: var(--accent-glow);
    line-height: 1;
    margin-bottom: 1rem;
}

/* --- Footer --- */
footer {
    padding: 4rem 0;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-muted);
}

/* --- Animations --- */
[data-reveal] {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-reveal].revealed {
    opacity: 1;
    transform: translateY(0);
}

/* --- Legal Pages --- */
.legal-content {
    max-width: 800px;
    margin: 8rem auto 4rem auto;
    padding: 0 2rem;
}

.legal-card {
    background: var(--card);
    padding: 3rem;
    border-radius: 24px;
    border: 1px solid var(--glass-border);
}

.legal-card h1 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.legal-card h2 {
    font-size: 1.25rem;
    margin-top: 1rem;
    margin-bottom: 0.5rem;
    color: var(--accent);
}

.legal-card p {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

/* Reset global section padding for legal sections specifically */
.legal-card section {
    padding: 0 !important;
    margin-bottom: 0.75rem;
}

/* --- Join Page Specifics --- */
.join-card {
    max-width: 450px;
    margin: 6rem auto;
    text-align: center;
}

.room-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent);
    padding: 0.5rem 1rem;
    border-radius: 99px;
    font-size: 0.8rem;
    font-weight: 700;
    margin-bottom: 1rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
}

@media (max-width: 768px) {
    .hero-grid, .step {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-text h1 {
        font-size: 2.5rem;
    }
    .cta-group {
        justify-content: center;
        flex-wrap: wrap;
    }
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: rgba(15, 23, 42, 0.95);
        backdrop-filter: blur(12px);
        padding: 1rem 2rem;
        gap: 1rem;
        border-bottom: 1px solid var(--glass-border);
    }
    .nav-links.open {
        display: flex;
    }
    .hamburger {
        display: flex;
    }
    .legal-card {
        padding: 1.5rem;
    }
}

/* --- Language Toggle --- */
html.lang-en [lang="de"],
html.lang-de [lang="en"] {
    display: none !important;
}

.lang-toggle {
    cursor: pointer;
    font-weight: 600;
    user-select: none;
    color: var(--text-muted);
    transition: color 0.3s;
}

.lang-toggle:hover {
    color: var(--accent);
}

/* --- Hamburger Menu --- */
.hamburger {
    display: none;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    color: var(--text);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 0.25rem;
    line-height: 1;
}