:root {
    --bg-primary: #09090b;
    --bg-secondary: #18181b;
    --text-primary: #f4f4f5;
    --text-secondary: #a1a1aa;
    --accent-primary: #8b5cf6; 
    --accent-glow: rgba(139, 92, 246, 0.3);
    --accent-gradient: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
    --success: #10b981;
    --danger: #ef4444;
    --border-color: #27272a;
    --radius-md: 16px;
    --radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

body.light-theme {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
}

/* Оболочка для фиксации футера внизу */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    margin: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 20px;
    flex: 1; /* Позволяет контенту занимать всё место, выталкивая футер вниз */
    display: flex;
    flex-direction: column;
}

/* --- HEADER --- */
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 40px 0 20px 0;
}

.logo-text h1 {
    font-size: 2.2rem;
    font-weight: 800;
    margin: 0;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-install-main {
    display: none;
    align-items: center;
    gap: 8px;
    background: var(--accent-primary);
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 50%;
    cursor: pointer;
}

/* --- КАТЕГОРИИ --- */
.categories-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding: 5px 0;
}

.category-pill {
    padding: 8px 18px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 100px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    cursor: pointer;
    white-space: nowrap;
}

.category-pill.active {
    background: var(--accent-primary);
    color: white;
}

/* --- КАРТОЧКА --- */
.scenario-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin-bottom: 24px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.scenario-title {
    font-size: 2.25rem;
    margin-bottom: 16px;
    line-height: 1.2;
}

.scenario-intro {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.comparison-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-bottom: 40px;
}

.comparison-column h3 {
    font-size: 1.1rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.col-changed h3 { color: var(--success); }
.col-disappeared h3 { color: var(--danger); }

.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    position: relative;
    padding: 12px 0 12px 28px;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.95rem;
}

.col-changed li::before { content: "→"; position: absolute; left: 0; color: var(--success); font-weight: bold; }
.col-disappeared li::before { content: "✕"; position: absolute; left: 0; color: var(--danger); font-weight: bold; }

/* --- DEEP DIVE --- */
.deep-dive-toggle {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 18px;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
}

.deep-dive-content {
    display: none;
    padding: 25px;
    background: rgba(9, 9, 11, 0.5);
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.deep-dive-content.visible { display: block; }

/* --- FOOTER (ЦЕНТРИРОВАНИЕ) --- */
.footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-link:hover { color: var(--accent-primary); }

.credit { margin: 0; opacity: 0.7; }

/* --- КНОПКИ НАВИГАЦИИ --- */
.controls-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.nav-buttons { display: flex; gap: 12px; }

.btn-primary, .btn-secondary, .btn-share {
    height: 52px;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 24px;
    border-radius: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-primary { background: var(--accent-primary); color: white; border: none; }
.btn-secondary { background: var(--bg-secondary); color: var(--text-primary); border: 1px solid var(--border-color); }
.btn-share { background: transparent; color: var(--text-secondary); border: 1px solid var(--border-color); }

.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: var(--text-primary);
    color: var(--bg-primary);
    padding: 12px 24px;
    border-radius: 100px;
    font-weight: 700;
    opacity: 0;
    transition: 0.3s;
}

.toast.show { transform: translateX(-50%) translateY(0); opacity: 1; }

.fade-in { animation: fadeIn 0.4s ease-out; }
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 650px) {
    .comparison-grid { grid-template-columns: 1fr; }
    .btn-install-main span { display: none; }
    .btn-install-main { width: 44px; height: 44px; padding: 0; justify-content: center; border-radius: 50%; }
    .controls-wrapper { flex-direction: column; gap: 20px; }
}