:root {
    --primary-color: #00d2ff;
    --secondary-color: #3a7bd5;
    --bg-dark: #0f172a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #f43f5e;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Background Animation */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(rgba(15, 23, 42, 0.8), rgba(15, 23, 42, 0.9)), url('../img/header_bg.png');
    background-size: cover;
    background-position: center;
    z-index: -2;
}

.blob {
    position: fixed;
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    filter: blur(80px);
    border-radius: 50%;
    z-index: -1;
    opacity: 0.15;
    animation: move 20s infinite alternate;
}

@keyframes move {
    from { transform: translate(-10%, -10%); }
    to { transform: translate(20%, 20%); }
}

/* Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-right: 1px border var(--glass-border);
    padding: 2rem;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    transition: transform 0.3s ease;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 3rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    list-style: none;
}

.nav-links li {
    margin-bottom: 0.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    display: block;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.nav-links a:hover, .nav-links a.active {
    background: var(--glass-bg);
    color: var(--text-main);
    padding-left: 1.5rem;
}

.nav-links a.active {
    border-left: 3px solid var(--primary-color);
}

/* Main Content */
.main-content {
    margin-left: 280px;
    flex: 1;
    padding: 4rem;
    max-width: 1600px;
}

section {
    margin-bottom: 6rem;
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease-out;
}

section.visible {
    opacity: 1;
    transform: translateY(0);
}

h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--primary-color);
}

p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

/* Components */
.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 2rem;
    margin-bottom: 2rem;
    transition: transform 0.3s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.card-flex {
    display: flex;
    gap: 4rem;
    align-items: flex-start;
}

.card-flex > .card {
    flex: 0.8;
    min-width: 400px;
    margin-bottom: 0;
}

.card-image-external {
    flex: 2;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.6);
    border: 1px solid var(--glass-border);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.card-image-external img {
    width: 100%;
    height: auto;
    display: block;
}

.card-image-external:hover {
    transform: translateY(-5px) scale(1.02);
}

.download-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(to right, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
    transform: scale(1.02);
}

code {
    background: #1e293b;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--accent);
    font-family: 'Fira Code', monospace;
    font-size: 0.9em;
}

.code-block {
    background: #000;
    padding: 1.5rem;
    border-radius: 12px;
    margin: 1.5rem 0;
    position: relative;
    overflow-x: auto;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary-color);
    color: var(--bg-dark);
    border-radius: 50%;
    margin-right: 1rem;
    font-weight: bold;
}

/* Responsive */
@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
        z-index: 100;
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
        padding: 2rem;
    }

    .card-flex {
        flex-direction: column;
    }

    .download-options {
        grid-template-columns: 1fr;
    }
}