:root {
    --primary: #0066ff;
    --primary-dark: #0052cc;
    --bg: #ffffff;
    --bg-alt: #f8faff;
    --text: #1a1a1a;
    --text-muted: #666666;
    --header-height: 70px;
    --shadow: 0 4px 20px rgba(0, 102, 255, 0.08);
}

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

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

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

a {
    text-decoration: none;
    color: inherit;
    transition: 0.3s;
}

ul {
    list-style: none;
}

/* Header */
header {
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 1px 0 rgba(0,0,0,0.05);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
}

.logo {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 4px;
}

.logo span {
    color: var(--text);
    font-weight: 400;
    font-size: 0.8em;
}

nav ul {
    display: flex;
    gap: 30px;
}

nav ul a {
    font-weight: 500;
    color: var(--text-muted);
}

nav ul a:hover, nav ul a.active {
    color: var(--primary);
}

.btn-nav {
    background: var(--primary);
    color: white;
    padding: 8px 20px;
    border-radius: 50px;
    font-weight: 600;
}

.btn-nav:hover {
    background: var(--primary-dark);
}

/* Hero */
.hero {
    padding: calc(var(--header-height) + 100px) 0 100px;
    background: radial-gradient(circle at top right, #e6f0ff 0%, #ffffff 50%);
    text-align: center;
}

.hero h1 {
    font-size: 48px;
    line-height: 1.2;
    margin-bottom: 20px;
    background: linear-gradient(45deg, #1a1a1a, #0066ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 20px;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
}

.btn-primary {
    background: var(--primary);
    color: white;
    padding: 18px 40px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 700;
    display: inline-block;
    box-shadow: 0 10px 30px rgba(0, 102, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0, 102, 255, 0.4);
}

.trust-badge {
    display: block;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-muted);
}

/* Section Common */
.section-title {
    text-align: center;
    font-size: 32px;
    margin-bottom: 50px;
}

/* Features */
.features {
    padding: 100px 0;
    background: var(--bg-alt);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    text-align: center;
    transition: 0.3s;
}

.feature-card:hover {
    transform: translateY(-10px);
}

.feature-card .icon {
    font-size: 40px;
    margin-bottom: 20px;
}

.feature-card h3 {
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--text-muted);
    font-size: 14px;
}

/* Steps */
.how-to-use {
    padding: 100px 0;
}

.steps {
    display: flex;
    justify-content: space-around;
    gap: 40px;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    flex: 1;
    min-width: 250px;
}

.step-num {
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    margin: 0 auto 20px;
    font-weight: 700;
    font-size: 20px;
}

/* FAQ */
.faq {
    padding: 100px 0;
    background: var(--bg-alt);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: white;
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 20px;
}

.faq-item h4 {
    margin-bottom: 10px;
    color: var(--primary);
}

/* Download Page Specific */
.dl-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 50px;
}

.dl-card {
    background: white;
    border: 1px solid #eee;
    padding: 30px;
    border-radius: 15px;
    text-align: center;
}

.btn-dl {
    display: block;
    background: #f0f5ff;
    color: var(--primary);
    padding: 10px;
    border-radius: 8px;
    margin-top: 15px;
    font-weight: 600;
}

.btn-dl:hover {
    background: var(--primary);
    color: white;
}

/* Footer */
footer {
    background: #111;
    color: #fff;
    padding: 80px 0 30px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 50px;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-links h4 {
    margin-bottom: 20px;
}

.footer-links ul li {
    margin-bottom: 10px;
}

.footer-links a {
    color: #999;
}

.footer-links a:hover {
    color: #fff;
}

.footer-bottom {
    border-top: 1px solid #222;
    padding-top: 30px;
    text-align: center;
    color: #666;
    font-size: 13px;
}

@media (max-width: 768px) {
    nav ul {
        display: none;
    }
    .hero h1 {
        font-size: 32px;
    }
}