/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    background: #0A1628;
    color: #FFFFFF;
    line-height: 1.6;
    overflow-x: hidden;
}
a { color: inherit; text-decoration: none; transition: color 0.3s; }
ul { list-style: none; }
img { max-width: 100%; display: block; }

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

/* ===== Navigation ===== */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(45, 127, 255, 0.1);
    padding: 15px 0;
}
.navbar .container { display: flex; align-items: center; justify-content: space-between; }
.nav-logo { font-size: 24px; font-weight: 700; color: #2D7FFF; letter-spacing: 1px; }
.nav-logo span { color: #00D4AA; }
.nav-menu { display: flex; gap: 30px; align-items: center; }
.nav-menu a { font-size: 15px; color: #8899AA; transition: color 0.3s; }
.nav-menu a:hover { color: #FFFFFF; }
.nav-cta {
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    color: #FFFFFF !important;
    padding: 10px 24px;
    border-radius: 25px;
    font-weight: 600;
    font-size: 14px;
    transition: transform 0.3s, box-shadow 0.3s;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(45, 127, 255, 0.4); }
.nav-toggle { display: none; flex-direction: column; gap: 5px; cursor: pointer; }
.nav-toggle span { width: 25px; height: 2px; background: #FFFFFF; transition: 0.3s; }

/* ===== Hero ===== */
.hero {
    min-height: 100vh;
    display: flex; align-items: center; justify-content: center;
    text-align: center;
    padding: 120px 20px 80px;
    background: radial-gradient(ellipse at 50% 0%, rgba(45, 127, 255, 0.15) 0%, transparent 60%),
                radial-gradient(ellipse at 80% 50%, rgba(0, 212, 170, 0.08) 0%, transparent 40%),
                #0A1628;
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='strict'%3E%3Cg fill='%232D7FFF' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}
.hero-content { position: relative; z-index: 1; max-width: 800px; }
.hero-badge {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(45, 127, 255, 0.1);
    border: 1px solid rgba(45, 127, 255, 0.3);
    padding: 8px 20px; border-radius: 30px;
    font-size: 14px; color: #4A8CFF;
    margin-bottom: 30px;
}
.hero-badge::before { content: '🔒'; }
.hero h1 {
    font-size: 56px; font-weight: 800;
    line-height: 1.2; margin-bottom: 24px;
    background: linear-gradient(135deg, #FFFFFF 0%, #4A8CFF 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero p {
    font-size: 20px; color: #8899AA;
    max-width: 600px; margin: 0 auto 40px;
    line-height: 1.8;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn-primary {
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    color: #FFFFFF; padding: 16px 40px;
    border-radius: 30px; font-size: 16px; font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
    display: inline-flex; align-items: center; gap: 8px;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 35px rgba(45, 127, 255, 0.4); }
.btn-secondary {
    background: transparent;
    border: 2px solid rgba(45, 127, 255, 0.5);
    color: #4A8CFF; padding: 14px 38px;
    border-radius: 30px; font-size: 16px; font-weight: 600;
    transition: all 0.3s;
    display: inline-flex; align-items: center; gap: 8px;
}
.btn-secondary:hover { border-color: #2D7FFF; background: rgba(45, 127, 255, 0.1); }

/* ===== Trust Section ===== */
.trust {
    padding: 60px 20px;
    background: rgba(26, 35, 50, 0.5);
    border-top: 1px solid rgba(45, 127, 255, 0.1);
    border-bottom: 1px solid rgba(45, 127, 255, 0.1);
}
.trust .container { text-align: center; }
.trust-stats { display: flex; justify-content: center; gap: 60px; flex-wrap: wrap; margin-bottom: 40px; }
.trust-stat { text-align: center; }
.trust-stat .number { font-size: 42px; font-weight: 800; color: #2D7FFF; margin-bottom: 8px; }
.trust-stat .label { font-size: 14px; color: #8899AA; }
.trust-badges { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; }
.trust-badge {
    display: flex; align-items: center; gap: 10px;
    background: rgba(45, 127, 255, 0.05);
    border: 1px solid rgba(45, 127, 255, 0.15);
    padding: 12px 24px; border-radius: 12px;
    font-size: 14px; color: #8899AA;
}
.trust-badge .icon { font-size: 20px; }

/* ===== Section Common ===== */
.section { padding: 100px 20px; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 {
    font-size: 40px; font-weight: 700;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #FFFFFF 0%, #4A8CFF 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.section-header p { font-size: 18px; color: #8899AA; max-width: 600px; margin: 0 auto; }

/* ===== Features Grid ===== */
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.8), rgba(10, 22, 40, 0.9));
    border: 1px solid rgba(45, 127, 255, 0.15);
    border-radius: 20px; padding: 40px 30px;
    text-align: center;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
}
.feature-card:hover {
    transform: translateY(-8px);
    border-color: rgba(45, 127, 255, 0.4);
    box-shadow: 0 20px 50px rgba(45, 127, 255, 0.15);
}
.feature-icon {
    width: 70px; height: 70px;
    background: linear-gradient(135deg, rgba(45, 127, 255, 0.15), rgba(0, 212, 170, 0.1));
    border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 24px; font-size: 32px;
}
.feature-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; color: #FFFFFF; }
.feature-card p { font-size: 15px; color: #8899AA; line-height: 1.7; }

/* ===== Product Preview ===== */
.preview { background: radial-gradient(ellipse at 50% 50%, rgba(45, 127, 255, 0.08) 0%, transparent 60%); }
.preview-content {
    display: flex; align-items: center; gap: 60px;
    max-width: 1000px; margin: 0 auto;
}
.preview-mockup {
    flex: 1; min-width: 300px;
    background: linear-gradient(135deg, #1A2332, #0A1628);
    border: 1px solid rgba(45, 127, 255, 0.2);
    border-radius: 24px; padding: 30px;
    aspect-ratio: 9/16; max-height: 500px;
    display: flex; flex-direction: column;
    overflow: hidden;
}
.mockup-header {
    display: flex; align-items: center; gap: 12px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(45, 127, 255, 0.1);
    margin-bottom: 20px;
}
.mockup-avatar {
    width: 40px; height: 40px;
    background: linear-gradient(135deg, #2D7FFF, #00D4AA);
    border-radius: 50%;
}
.mockup-name { font-size: 16px; font-weight: 600; }
.mockup-encrypt { font-size: 12px; color: #00D4AA; display: flex; align-items: center; gap: 4px; }
.mockup-encrypt::before { content: '🔒'; font-size: 10px; }
.mockup-messages { flex: 1; display: flex; flex-direction: column; gap: 12px; }
.mockup-msg {
    padding: 12px 16px; border-radius: 16px;
    font-size: 14px; max-width: 80%;
    line-height: 1.5;
}
.mockup-msg.received {
    background: rgba(45, 127, 255, 0.1);
    border: 1px solid rgba(45, 127, 255, 0.15);
    align-self: flex-start;
    color: #FFFFFF;
}
.mockup-msg.sent {
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    align-self: flex-end;
    color: #FFFFFF;
}
.mockup-msg.burn {
    background: rgba(255, 100, 50, 0.1);
    border: 1px solid rgba(255, 100, 50, 0.2);
    align-self: flex-start;
    color: #FF8866;
    font-style: italic;
}
.mockup-msg.burn::after { content: ' 🔥 阅后即焚'; font-size: 11px; opacity: 0.7; }
.preview-text { flex: 1; }
.preview-text h3 { font-size: 32px; font-weight: 700; margin-bottom: 20px; color: #FFFFFF; }
.preview-text p { font-size: 16px; color: #8899AA; line-height: 1.8; margin-bottom: 16px; }
.preview-list { display: flex; flex-direction: column; gap: 12px; }
.preview-list li {
    display: flex; align-items: center; gap: 12px;
    font-size: 15px; color: #FFFFFF;
}
.preview-list li::before {
    content: '✓';
    display: flex; align-items: center; justify-content: center;
    width: 24px; height: 24px;
    background: rgba(0, 212, 170, 0.15);
    color: #00D4AA; border-radius: 50%;
    font-size: 12px; font-weight: 700;
    flex-shrink: 0;
}

/* ===== Security Section ===== */
.security { background: rgba(26, 35, 50, 0.3); }
.security-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.security-card {
    background: linear-gradient(135deg, rgba(10, 22, 40, 0.9), rgba(26, 35, 50, 0.8));
    border: 1px solid rgba(0, 212, 170, 0.15);
    border-radius: 20px; padding: 40px 30px;
    transition: transform 0.3s, border-color 0.3s;
}
.security-card:hover { transform: translateY(-5px); border-color: rgba(0, 212, 170, 0.4); }
.security-card .icon { font-size: 40px; margin-bottom: 20px; }
.security-card h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; color: #FFFFFF; }
.security-card p { font-size: 15px; color: #8899AA; line-height: 1.7; }

/* ===== Testimonials ===== */
.testimonials-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.testimonial-card {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.6), rgba(10, 22, 40, 0.8));
    border: 1px solid rgba(45, 127, 255, 0.1);
    border-radius: 20px; padding: 30px;
    transition: transform 0.3s;
}
.testimonial-card:hover { transform: translateY(-5px); }
.testimonial-stars { color: #FFB800; font-size: 16px; margin-bottom: 16px; letter-spacing: 2px; }
.testimonial-text { font-size: 15px; color: #8899AA; line-height: 1.7; margin-bottom: 20px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
    width: 44px; height: 44px;
    background: linear-gradient(135deg, #2D7FFF, #00D4AA);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 18px; font-weight: 700; color: #FFFFFF;
}
.testimonial-info .name { font-size: 15px; font-weight: 600; color: #FFFFFF; }
.testimonial-info .role { font-size: 13px; color: #8899AA; }

/* ===== CTA Section ===== */
.cta-section {
    padding: 100px 20px;
    text-align: center;
    background: radial-gradient(ellipse at 50% 50%, rgba(45, 127, 255, 0.12) 0%, transparent 60%);
}
.cta-section h2 {
    font-size: 40px; font-weight: 700; margin-bottom: 16px;
    background: linear-gradient(135deg, #FFFFFF 0%, #4A8CFF 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.cta-section p { font-size: 18px; color: #8899AA; margin-bottom: 40px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.download-btn {
    display: inline-flex; align-items: center; gap: 12px;
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.9), rgba(45, 127, 255, 0.1));
    border: 1px solid rgba(45, 127, 255, 0.3);
    padding: 16px 32px; border-radius: 16px;
    transition: all 0.3s;
}
.download-btn:hover { border-color: #2D7FFF; transform: translateY(-3px); box-shadow: 0 12px 35px rgba(45, 127, 255, 0.2); }
.download-btn .icon { font-size: 28px; }
.download-btn .text { text-align: left; }
.download-btn .text .small { font-size: 12px; color: #8899AA; }
.download-btn .text .big { font-size: 16px; font-weight: 600; color: #FFFFFF; }

/* ===== Footer ===== */
.footer {
    background: #060E1A;
    border-top: 1px solid rgba(45, 127, 255, 0.1);
    padding: 60px 20px 30px;
}
.footer-content { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand .logo { font-size: 24px; font-weight: 700; color: #2D7FFF; margin-bottom: 16px; }
.footer-brand .logo span { color: #00D4AA; }
.footer-brand p { font-size: 14px; color: #8899AA; line-height: 1.7; max-width: 300px; }
.footer-col h4 { font-size: 16px; font-weight: 600; color: #FFFFFF; margin-bottom: 20px; }
.footer-col a { display: block; font-size: 14px; color: #8899AA; margin-bottom: 12px; transition: color 0.3s; }
.footer-col a:hover { color: #2D7FFF; }
.footer-bottom {
    border-top: 1px solid rgba(45, 127, 255, 0.1);
    padding-top: 24px;
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 16px;
}
.footer-bottom p { font-size: 13px; color: #8899AA; }
.footer-bottom-links { display: flex; gap: 24px; }
.footer-bottom-links a { font-size: 13px; color: #8899AA; }
.footer-bottom-links a:hover { color: #2D7FFF; }

/* ===== Page Header (for inner pages) ===== */
.page-header {
    padding: 160px 20px 80px;
    text-align: center;
    background: radial-gradient(ellipse at 50% 0%, rgba(45, 127, 255, 0.12) 0%, transparent 50%),
                #0A1628;
}
.page-header h1 {
    font-size: 48px; font-weight: 800; margin-bottom: 16px;
    background: linear-gradient(135deg, #FFFFFF 0%, #4A8CFF 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.page-header p { font-size: 18px; color: #8899AA; max-width: 600px; margin: 0 auto; }

/* ===== Features Page ===== */
.feature-detail {
    padding: 80px 20px;
    border-bottom: 1px solid rgba(45, 127, 255, 0.1);
}
.feature-detail:nth-child(even) { background: rgba(26, 35, 50, 0.3); }
.feature-detail-content {
    display: flex; align-items: center; gap: 60px;
    max-width: 1000px; margin: 0 auto;
}
.feature-detail:nth-child(even) .feature-detail-content { flex-direction: row-reverse; }
.feature-detail-visual {
    flex: 1; min-width: 280px;
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.8), rgba(10, 22, 40, 0.9));
    border: 1px solid rgba(45, 127, 255, 0.15);
    border-radius: 24px; padding: 40px;
    text-align: center; font-size: 80px;
    aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
}
.feature-detail-text { flex: 1; }
.feature-detail-text h2 { font-size: 32px; font-weight: 700; margin-bottom: 16px; color: #FFFFFF; }
.feature-detail-text p { font-size: 16px; color: #8899AA; line-height: 1.8; margin-bottom: 20px; }
.feature-detail-text ul { display: flex; flex-direction: column; gap: 10px; }
.feature-detail-text li {
    display: flex; align-items: flex-start; gap: 10px;
    font-size: 15px; color: #FFFFFF; line-height: 1.6;
}
.feature-detail-text li::before {
    content: '✓'; color: #00D4AA; font-weight: 700; flex-shrink: 0; margin-top: 2px;
}

/* ===== Pricing ===== */
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; max-width: 1000px; margin: 0 auto; }
.pricing-card {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.8), rgba(10, 22, 40, 0.9));
    border: 1px solid rgba(45, 127, 255, 0.15);
    border-radius: 24px; padding: 40px 30px;
    text-align: center;
    transition: transform 0.3s, border-color 0.3s;
    position: relative;
}
.pricing-card:hover { transform: translateY(-8px); }
.pricing-card.featured {
    border-color: rgba(45, 127, 255, 0.5);
    box-shadow: 0 20px 60px rgba(45, 127, 255, 0.15);
}
.pricing-card.featured::before {
    content: '推荐';
    position: absolute; top: -12px; left: 50%; transform: translateX(-50%);
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    color: #FFFFFF; padding: 4px 20px; border-radius: 20px;
    font-size: 13px; font-weight: 600;
}
.pricing-name { font-size: 20px; font-weight: 600; color: #FFFFFF; margin-bottom: 8px; }
.pricing-price { font-size: 48px; font-weight: 800; color: #2D7FFF; margin-bottom: 8px; }
.pricing-price span { font-size: 16px; color: #8899AA; font-weight: 400; }
.pricing-desc { font-size: 14px; color: #8899AA; margin-bottom: 30px; }
.pricing-features { text-align: left; margin-bottom: 30px; }
.pricing-features li {
    display: flex; align-items: center; gap: 10px;
    font-size: 14px; color: #8899AA; padding: 10px 0;
    border-bottom: 1px solid rgba(45, 127, 255, 0.05);
}
.pricing-features li::before { content: '✓'; color: #00D4AA; font-weight: 700; }
.pricing-btn {
    display: block; width: 100%;
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    color: #FFFFFF; padding: 14px; border-radius: 12px;
    font-size: 16px; font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}
.pricing-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(45, 127, 255, 0.3); }
.pricing-btn.outline {
    background: transparent;
    border: 2px solid rgba(45, 127, 255, 0.4);
    color: #4A8CFF;
}
.pricing-btn.outline:hover { background: rgba(45, 127, 255, 0.1); }

/* ===== FAQ ===== */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 20px; }
.faq-item {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.6), rgba(10, 22, 40, 0.8));
    border: 1px solid rgba(45, 127, 255, 0.1);
    border-radius: 16px; padding: 30px;
}
.faq-category {
    display: inline-flex; align-items: center; gap: 8px;
    background: rgba(45, 127, 255, 0.1);
    border: 1px solid rgba(45, 127, 255, 0.2);
    padding: 6px 16px; border-radius: 20px;
    font-size: 13px; color: #4A8CFF; font-weight: 600;
    margin-bottom: 16px;
}
.faq-item h3 { font-size: 20px; font-weight: 600; color: #FFFFFF; margin-bottom: 16px; }
.faq-steps { display: flex; flex-direction: column; gap: 12px; }
.faq-step {
    display: flex; gap: 12px; align-items: flex-start;
    font-size: 15px; color: #8899AA; line-height: 1.7;
}
.faq-step-num {
    width: 28px; height: 28px; flex-shrink: 0;
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    color: #FFFFFF; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 13px; font-weight: 700; margin-top: 2px;
}

/* ===== About ===== */
.about-content { max-width: 800px; margin: 0 auto; }
.about-section { margin-bottom: 60px; }
.about-section h2 { font-size: 28px; font-weight: 700; color: #FFFFFF; margin-bottom: 20px; }
.about-section p { font-size: 16px; color: #8899AA; line-height: 1.8; margin-bottom: 16px; }
.about-values { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 40px; }
.about-value {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.6), rgba(10, 22, 40, 0.8));
    border: 1px solid rgba(45, 127, 255, 0.1);
    border-radius: 16px; padding: 30px; text-align: center;
}
.about-value .icon { font-size: 40px; margin-bottom: 16px; }
.about-value h3 { font-size: 18px; font-weight: 600; color: #FFFFFF; margin-bottom: 10px; }
.about-value p { font-size: 14px; color: #8899AA; line-height: 1.7; }

/* ===== Download Page ===== */
.download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; max-width: 900px; margin: 0 auto; }
.download-card {
    background: linear-gradient(135deg, rgba(26, 35, 50, 0.8), rgba(10, 22, 40, 0.9));
    border: 1px solid rgba(45, 127, 255, 0.15);
    border-radius: 24px; padding: 40px 30px;
    text-align: center;
    transition: transform 0.3s, border-color 0.3s;
}
.download-card:hover { transform: translateY(-8px); border-color: rgba(45, 127, 255, 0.4); }
.download-card .icon { font-size: 60px; margin-bottom: 20px; }
.download-card h3 { font-size: 22px; font-weight: 600; color: #FFFFFF; margin-bottom: 10px; }
.download-card .version { font-size: 13px; color: #8899AA; margin-bottom: 20px; }
.download-card .dl-btn {
    display: inline-block;
    background: linear-gradient(135deg, #2D7FFF, #4A8CFF);
    color: #FFFFFF; padding: 14px 40px; border-radius: 12px;
    font-size: 16px; font-weight: 600;
    transition: transform 0.3s, box-shadow 0.3s;
}
.download-card .dl-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(45, 127, 255, 0.3); }
.download-card .req { font-size: 13px; color: #8899AA; margin-top: 16px; }

/* ===== Security Page ===== */
.security-detail { max-width: 900px; margin: 0 auto; }
.security-detail-item {
    display: flex; gap: 30px; align-items: flex-start;
    padding: 40px 0;
    border-bottom: 1px solid rgba(45, 127, 255, 0.1);
}
.security-detail-icon {
    width: 80px; height: 80px; flex-shrink: 0;
    background: linear-gradient(135deg, rgba(0, 212, 170, 0.1), rgba(45, 127, 255, 0.1));
    border: 1px solid rgba(0, 212, 170, 0.2);
    border-radius: 20px;
    display: flex; align-items: center; justify-content: center;
    font-size: 36px;
}
.security-detail-text h3 { font-size: 24px; font-weight: 600; color: #FFFFFF; margin-bottom: 12px; }
.security-detail-text p { font-size: 16px; color: #8899AA; line-height: 1.8; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .security-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonials-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-content { grid-template-columns: 1fr 1fr; }
    .pricing-grid { grid-template-columns: repeat(2, 1fr); }
    .preview-content { flex-direction: column; }
    .feature-detail-content { flex-direction: column !important; }
}
@media (max-width: 768px) {
    .nav-menu { display: none; }
    .nav-toggle { display: flex; }
    .nav-menu.active {
        display: flex; flex-direction: column;
        position: absolute; top: 100%; left: 0; right: 0;
        background: rgba(10, 22, 40, 0.98);
        padding: 20px; gap: 16px;
        border-bottom: 1px solid rgba(45, 127, 255, 0.1);
    }
    .hero h1 { font-size: 36px; }
    .hero p { font-size: 16px; }
    .section-header h2 { font-size: 30px; }
    .features-grid { grid-template-columns: 1fr; }
    .security-grid { grid-template-columns: 1fr; }
    .testimonials-grid { grid-template-columns: 1fr; }
    .footer-content { grid-template-columns: 1fr; }
    .pricing-grid { grid-template-columns: 1fr; }
    .download-grid { grid-template-columns: 1fr; }
    .trust-stats { gap: 30px; }
    .trust-stat .number { font-size: 32px; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .cta-buttons { flex-direction: column; align-items: center; }
    .page-header h1 { font-size: 32px; }
    .about-values { grid-template-columns: 1fr; }
    .security-detail-item { flex-direction: column; }
    .footer-bottom { flex-direction: column; text-align: center; }
}