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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: #0a0a0f;
    color: #c7d2e0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: #818cf8;
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Nav */

nav {
    position: sticky;
    top: 0;
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #1e1e2e;
    z-index: 10;
}

.nav-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo:hover {
    text-decoration: none;
}

.logo svg {
    height: 24px;
    width: 140px;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav-links a {
    color: #9ca3af;
    font-size: 14px;
}

.nav-links a:hover {
    color: #c7d2fe;
    text-decoration: none;
}

#lang-select {
    background: #12121c;
    color: #6b7280;
    border: 1px solid #1e1e2e;
    padding: 4px 8px;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
}

/* Hero */

.hero {
    max-width: 640px;
    margin: 0 auto;
    padding: 120px 24px 100px;
    text-align: center;
}

.hero-logo {
    margin-bottom: 40px;
    text-align: center;
}

.hero-logo svg {
    width: 260px;
    height: auto;
}

.hero h1 {
    font-size: 40px;
    font-weight: 600;
    color: #e8eaf0;
    letter-spacing: -0.5px;
    margin-bottom: 16px;
}

.hero p {
    font-size: 17px;
    color: #9ca3af;
    margin-bottom: 32px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Buttons */

.btn {
    display: inline-block;
    padding: 10px 24px;
    background: #6366f1;
    color: #fff;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    transition: background 0.2s;
}

.btn:hover {
    background: #818cf8;
    text-decoration: none;
}

.btn-secondary {
    background: #12121c;
    color: #c7d2e0;
    border: 1px solid #1e1e2e;
}

.btn-secondary:hover {
    background: #1a1a2a;
}

/* Sections */

section {
    max-width: 960px;
    margin: 0 auto;
    padding: 80px 24px;
}

section h2 {
    font-size: 28px;
    font-weight: 600;
    color: #e8eaf0;
    margin-bottom: 12px;
    letter-spacing: -0.3px;
}

section > p {
    color: #9ca3af;
    font-size: 16px;
    margin-bottom: 40px;
}

/* Features */

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    margin-top: 40px;
}

.feature {
    padding: 24px;
    background: #0d0d16;
    border: 1px solid #1e1e2e;
    border-radius: 8px;
}

.feature h3 {
    font-size: 16px;
    font-weight: 600;
    color: #c7d2fe;
    margin-bottom: 8px;
}

.feature p {
    font-size: 14px;
    color: #9ca3af;
    line-height: 1.6;
}

/* Download */

#download {
    text-align: center;
}

.download-links {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 24px;
}

.note {
    font-size: 13px;
    color: #6b7280;
    max-width: 520px;
    margin: 0 auto;
}

/* FAQ */

.faq-list {
    margin-top: 32px;
}

details {
    border-bottom: 1px solid #1e1e2e;
    padding: 16px 0;
}

details summary {
    font-size: 15px;
    font-weight: 500;
    color: #e8eaf0;
    cursor: pointer;
    list-style: none;
}

details summary::before {
    content: "+ ";
    color: #6366f1;
    margin-right: 8px;
}

details[open] summary::before {
    content: "- ";
}

details p {
    margin-top: 10px;
    font-size: 14px;
    color: #9ca3af;
    padding-left: 20px;
}

/* Footer */

footer {
    border-top: 1px solid #1e1e2e;
    margin-top: 40px;
}

.footer-inner {
    max-width: 960px;
    margin: 0 auto;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    color: #4b5563;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: #4b5563;
    font-size: 13px;
}

.footer-links a:hover {
    color: #818cf8;
}

/* Responsive */

@media (max-width: 768px) {
    .hero h1 {
        font-size: 28px;
    }

    .hero {
        padding: 80px 24px 60px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

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

    .nav-links a:not(:last-child) {
        display: none;
    }
}