/* --- GLOBAL VARIABLES --- */
:root {
    --bg-color: #000000;
    --card-bg: #1c1c1e;
    --text-primary: #ffffff;
    --text-secondary: #8e8e93;
    --accent-blue: #0a84ff;
    --accent-green: #34c759;
    --nav-blur: rgba(28, 28, 30, 0.7);
}

/* --- RESET & TYPOGRAPHY --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.8;
}

/* --- NAVIGATION --- */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--nav-blur);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

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

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

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

/* --- HERO SECTION --- */
.hero {
    margin-top: 120px;
    padding: 0 5%;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -1.5px;
    margin-bottom: 1rem;
    line-height: 1.1;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2.5rem;
}

.download-btn {
    display: inline-block;
    background-color: var(--text-primary);
    color: var(--bg-color);
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 4rem;
}

.download-btn:hover {
    opacity: 0.9;
    color: var(--bg-color);
}

.hero-mockup-container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
}

.hero-mockup-container img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.5);
}

/* --- CONTENT SECTIONS --- */
.section-container {
    max-width: 800px;
    margin: 120px auto;
    padding: 0 5%;
}

.section-container h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    letter-spacing: -0.5px;
}

.section-container p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

/* --- FEATURES GRID --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 4rem;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border-radius: 16px;
    text-align: left;
}

.feature-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
}

/* --- FOOTER --- */
footer {
    text-align: center;
    padding: 3rem 5%;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-top: 4rem;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .hero h1 { font-size: 2.5rem; }
    .hero p { font-size: 1.1rem; }
}