:root {
    --bg: #FFFFFF;
    --text-main: #1D1D1F;
    --text-sub: #007AFF; /* Your Mobile App Blue */
    --accent-purple: #5856D6;
    --pill-border: #E5E5E7;
    --pill-text: #8E8E93;
    --btn-black: #121212;
    --gray-bg: #F5F5F7;
}

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

body {
    background-color: var(--bg);
    color: var(--text-main);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", sans-serif;
    line-height: 1.4;
}

/* --- Responsive Navigation --- */
nav {
    width: 100%;
    padding: 20px 5%;
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--gray-bg);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo { font-size: 1.5rem; font-weight: 800; letter-spacing: -0.5px; }
.sub-logo { color: var(--text-sub); font-size: 0.65rem; font-weight: 700; text-transform: uppercase; letter-spacing: 1.2px; }

.btn-nav {
    background: var(--btn-black);
    color: white;
    padding: 8px 16px;
    border-radius: 10px;
    font-weight: 600;
    border: none;
    font-size: 0.85rem;
}

/* --- Hero Section (Centered) --- */
.hero {
    padding: 100px 24px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    max-width: 800px;
    margin: 0 auto;
}

.badge-container { display: flex; gap: 8px; margin-bottom: 30px; }
.pill { padding: 6px 14px; border-radius: 20px; font-size: 0.7rem; font-weight: 700; border: 1px solid var(--pill-border); color: var(--pill-text); text-transform: uppercase; }
.pill.active { color: var(--accent-purple); border-color: var(--accent-purple); }

h1 { font-size: 4rem; font-weight: 800; letter-spacing: -2px; margin-bottom: 24px; line-height: 1.05; }
.blue-text { color: var(--text-sub); }

.hero p { font-size: 1.25rem; color: #636366; margin-bottom: 40px; max-width: 600px; }

.btn-main {
    background: var(--btn-black);
    color: white;
    width: 100%;
    max-width: 340px;
    padding: 20px;
    border-radius: 18px;
    font-weight: 700;
    font-size: 1rem;
    border: none;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: transform 0.2s;
}

.btn-main:hover { transform: scale(1.02); }
.small-note { font-size: 0.75rem; color: #8E8E93; margin-top: 12px; }

/* --- Features Section (Responsive Grid) --- */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 80px 5%;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--gray-bg);
    padding: 40px;
    border-radius: 28px;
    transition: 0.3s;
}

.feature-card:hover { background: #EBEBEB; }
.feature-card h3 { font-size: 1.4rem; margin-bottom: 12px; }
.feature-card p { color: #636366; font-size: 1rem; }

/* --- Mobile Specific Fixes --- */
@media (max-width: 768px) {
    h1 { font-size: 2.8rem; }
    .hero { padding: 60px 20px; }
    .features { grid-template-columns: 1fr; }
    .feature-card { padding: 30px; }
}

footer { padding: 60px 20px; text-align: center; color: #8E8E93; font-size: 0.8rem; border-top: 1px solid var(--gray-bg); }