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

body {
    font-family: 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #121212, #1f1f1f);
    color: #e0e0e0;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: auto;
    padding: 0 20px;
}

/* HEADER */
.header {
    background: rgba(18, 18, 18, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.back-btn {
    text-decoration: none;
    color: #ffd93d;
    font-weight: 500;
    padding: 0.4rem 1rem;
    border-radius: 25px;
}

.back-btn:hover {
    background: #ffd93d;
    color: #121212;
}

.app-name {
    font-size: 1.5rem;
    font-weight: bold;
    color: #ff6b6b;
}

/* NAVIGATION */
.nav {
    display: flex;
    gap: 1.2rem;
}

.nav-link {
    color: #e0e0e0;
    font-weight: 500;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: linear-gradient(45deg, #ff6b6b, #ffd93d);
    color: #121212;
    box-shadow: 0 5px 15px rgba(255, 107, 107, 0.3);
}

/* Responsive NAV (hamburger with <details>) */
@media (max-width: 768px) {
    .nav {
        display: none;
        flex-direction: column;
        width: 100%;
        margin-top: 1rem;
        gap: 0.5rem;
    }

    .nav-link {
        background: rgba(255, 255, 255, 0.05);
        width: 100%;
        text-align: center;
    }

    .header .container {
        flex-direction: column;
        align-items: flex-start;
    }

    details.nav-toggle {
        width: 100%;
    }

    summary.nav-summary {
        background: rgba(255, 255, 255, 0.1);
        padding: 0.5rem 1rem;
        border-radius: 10px;
        font-size: 1rem;
        color: #ffd93d;
        cursor: pointer;
        list-style: none;
        margin-top: 1rem;
        width: 100%;
    }

    details[open] .nav {
        display: flex;
    }
}

/* 🪩 Hero */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    text-align: center;
}

.app-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 2rem;
}

.app-icon {
    font-size: 6rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 25px;
    padding: 1rem;
}

.app-title {
    font-size: 2.5rem;
    font-weight: bold;
}

.app-subtitle {
    font-size: 1.2rem;
    color: #ffd93d;
    margin-top: 0.5rem;
}

.app-meta span {
    background: #2a2a2a;
    padding: 0.3rem 0.8rem;
    border-radius: 15px;
    font-size: 0.9rem;
    margin-right: 0.5rem;
}

/* 🔘 Buttons */
.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    cursor: pointer;
    text-decoration: none;
    display: inline-block;
    position: relative;
    transition: all 0.3s ease;
    margin: 7px;
}

.btn-primary {
    background: linear-gradient(45deg, #4CAF50, #45a049);
    color: white;
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn:hover {
    transform: translateY(-2px);
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-top: 1.5rem;
}

/* 📝 Description */
.description {
    padding: 80px 0;
}

.description h2 {
    text-align: center;
    color: #ffd93d;
    margin-bottom: 2rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: #1e1e1e;
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}


/* 📦 Download Section */
.download-section {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 80px 0;
    color: white;
}

.download-section h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

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

.download-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 1.5rem;
    text-align: center;
}

.stat-item {
    align-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 15px;
    padding: 1rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
}

/* 👨‍💻 Developer Section */
.developer-section {
    padding: 80px 0;
    background: #1e1e1e;
    color: #ccc;
    text-align: center;
}

.developer-avatar {
    font-size: 5rem;
    background: linear-gradient(45deg, #ff6b6b, #ffd93d);
    border-radius: 50%;
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: auto;
    margin-bottom: 1.5rem;
}

.tech-items {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin: 1rem 0;
}

.tech-item {
    background: #333;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    color: #ffd93d;
}

/* 🐙 Open Source */
.source-section {
    padding: 60px 0;
    background: #0f0f0f;
    color: #ccc;
    text-align: center;
}

.source-card {
    max-width: 700px;
    margin: auto;
    padding: 2rem;
    background: #1e1e1e;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* 🦶 Footer */
.footer {
    background: #0a0a0a;
    color: #e0e0e0;
    padding: 3rem 0 1rem;
    text-align: center;
    border-top: 1px solid #333;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: #ffd93d;
}

.footer-section a {
    color: #ccc;
    text-decoration: none;
}

.footer-section a:hover {
    color: #ffd93d;
}

.footer-note {
    font-style: italic;
    margin-top: 0.5rem;
    color: #888;
}

/* 📱 Responsive */
@media (max-width: 768px) {
    .app-header {
        flex-direction: column;
        text-align: center;
    }

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

    .developer-info {
        flex-direction: column;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
}