:root {
    --bg-white: #ffffff;
    --bg-gray: #f5f5f7;
    --text-primary: #1d1d1f;
    --text-secondary: #6e6e73;
    --text-light: #86868b;
    --border-light: #d2d2d7;
    --accent-black: #000000;
    --accent-blue: #0071e3;
    --whatsapp-green: #25D366;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.08);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Inter', 'Segoe UI', Roboto, sans-serif; background: var(--bg-white); color: var(--text-primary); line-height: 1.5; overflow-x: hidden; opacity: 1; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 24px; }
html { scroll-behavior: smooth; }

/* Navigation */
.navbar { position: fixed; top: 0; width: 100%; background: rgba(255,255,255,0.85); backdrop-filter: blur(20px); z-index: 999; border-bottom: 1px solid rgba(0,0,0,0.05); }
.nav-content { display: flex; justify-content: space-between; align-items: center; height: 60px; }
.logo { font-weight: 700; font-size: 21px; color: var(--text-primary); text-decoration: none; letter-spacing: -0.02em; }
.nav-links { display: flex; gap: 32px; align-items: center; }
.nav-links a { color: var(--text-secondary); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.2s; }
.nav-links a:hover { color: var(--text-primary); }
.btn-cta { background: var(--accent-black); color: white !important; padding: 10px 20px; border-radius: 100px; font-size: 13px; font-weight: 500; transition: all 0.2s; }
.btn-cta:hover { transform: scale(1.05); box-shadow: 0 4px 12px rgba(0,0,0,0.2); }

/* Mobile Menu */
.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.mobile-menu-btn span { width: 24px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: 0.3s; }
.mobile-menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* Hero */
.hero { padding: 160px 0 100px; text-align: center; }
.tagline { display: flex; justify-content: center; align-items: center; gap: 16px; margin-bottom: 40px; font-size: 16px; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; color: var(--text-secondary); }
.hero h1 { font-size: 72px; font-weight: 700; line-height: 1.05; margin-bottom: 24px; letter-spacing: -0.03em; color: var(--accent-black); }
.hero-subtitle { font-size: 21px; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.5; max-width: 680px; margin-left: auto; margin-right: auto; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

.btn-demo, .btn-telegram { background: white; border: 1px solid var(--border-light); padding: 16px 24px; border-radius: 16px; display: flex; gap: 16px; align-items: center; text-decoration: none; color: var(--text-primary); transition: all 0.3s ease; text-align: left; }
.btn-demo:hover, .btn-telegram:hover { border-color: var(--accent-black); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
.btn-text { display: flex; flex-direction: column; align-items: flex-start; }
.btn-text .main { font-size: 15px; font-weight: 600; }
.btn-text .sub { font-size: 12px; color: var(--text-secondary); }

/* WhatsApp Float */
.whatsapp-float { position: fixed; bottom: 30px; right: 30px; z-index: 1000; display: flex; flex-direction: column; align-items: center; gap: 2px; text-decoration: none; transition: transform 0.3s ease; }
.whatsapp-float:hover { transform: scale(1.1); }
.wa-icon-circle { width: 60px; height: 60px; background-color: var(--whatsapp-green); border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 4px 12px rgba(0,0,0,0.3); color: white; }
.whatsapp-icon { width: 28px; height: 28px; fill: white; }
.wa-text { font-size: 10px; font-weight: 700; color: var(--text-primary); letter-spacing: 0.5px; background: white; padding: 2px 8px; border-radius: 10px; box-shadow: 0 2px 4px rgba(0,0,0,0.1); margin-bottom: 4px; }

/* Sections */
.system-section, .features-section { padding: 100px 0; background: var(--bg-gray); }
.process-section, .contact-section { padding: 100px 0; background: var(--bg-white); }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 48px; font-weight: 700; margin-bottom: 16px; letter-spacing: -0.02em; }
.section-header p { font-size: 20px; color: var(--text-secondary); }

.system-grid, .features-grid { display: grid; gap: 24px; }
.system-grid { grid-template-columns: repeat(3, 1fr); }
.features-grid { grid-template-columns: repeat(2, 1fr); gap: 40px; }

.system-card, .feature-item { background: white; padding: 40px 32px; border-radius: 24px; border: 1px solid var(--border-light); transition: transform 0.3s; }
.feature-item { display: flex; gap: 20px; align-items: flex-start; padding: 0; border: none; background: transparent; }
.system-card:hover { transform: translateY(-5px); }

.card-number { font-size: 12px; font-weight: 700; color: var(--text-light); margin-bottom: 16px; }
.card-icon, .feature-icon { color: var(--accent-black); margin-bottom: 20px; }
.system-card h3, .feature-item h3 { font-size: 20px; font-weight: 600; margin-bottom: 12px; }
.system-card p, .feature-item p { color: var(--text-secondary); font-size: 15px; line-height: 1.6; }
.tags { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.tags span { font-size: 11px; background: var(--bg-gray); padding: 4px 8px; border-radius: 4px; color: var(--text-secondary); }

/* Process */
.process-steps { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 40px; }
.process-step { display: flex; gap: 40px; align-items: flex-start; }
.step-visual { display: flex; flex-direction: column; align-items: center; gap: 16px; }
.step-icon { width: 50px; height: 50px; background: white; border-radius: 12px; display: flex; align-items: center; justify-content: center; border: 1px solid var(--border-light); }
.step-content h3 { font-size: 24px; font-weight: 600; margin-bottom: 8px; }

/* FAQ Section */
.faq-section { padding: 100px 0; background: var(--bg-white); }
.faq-container { max-width: 900px; margin: 0 auto; display: flex; flex-direction: column; gap: 16px; }
.faq-item { background: white; border: 1px solid var(--border-light); border-radius: 16px; overflow: hidden; transition: all 0.3s ease; }
.faq-item:hover { box-shadow: var(--shadow-hover); }
.faq-question { width: 100%; display: flex; justify-content: space-between; align-items: center; padding: 24px 28px; background: none; border: none; cursor: pointer; text-align: left; font-size: 17px; font-weight: 600; color: var(--text-primary); transition: all 0.3s ease; }
.faq-question:hover { color: var(--accent-black); }
.faq-icon { width: 20px; height: 20px; color: var(--text-secondary); transition: transform 0.3s ease; flex-shrink: 0; margin-left: 16px; }
.faq-item.active .faq-icon { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.4s ease; }
.faq-answer p { padding: 0 28px 24px; color: var(--text-secondary); font-size: 15px; line-height: 1.7; }
.faq-answer a { color: var(--accent-black); text-decoration: none; font-weight: 600; border-bottom: 1px solid var(--accent-black); transition: opacity 0.2s; }
.faq-answer a:hover { opacity: 0.7; }
.faq-item.active .faq-answer { max-height: 800px; }

/* Contact */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; }
.contact-methods { display: flex; flex-direction: column; gap: 16px; margin-top: 40px; }
.contact-method-btn { background: white; padding: 20px 24px; border-radius: 16px; border: 1px solid var(--border-light); display: flex; gap: 20px; align-items: center; text-decoration: none; color: var(--text-primary); transition: all 0.3s ease; box-shadow: 0 2px 8px rgba(0,0,0,0.04); }
.contact-method-btn:hover { transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.12); border-color: var(--accent-black); }
.method-icon { width: 28px; height: 28px; color: var(--accent-black); }
.method-info { display: flex; flex-direction: column; gap: 4px; }
.method-info .label { font-size: 12px; color: var(--text-light); text-transform: uppercase; font-weight: 600; }
.method-info .value { font-size: 17px; font-weight: 600; }

.contact-form-wrapper { background: var(--bg-gray); padding: 40px; border-radius: 24px; border: 1px solid var(--border-light); }
.form-group { margin-bottom: 16px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px; border: 1px solid transparent; border-radius: 10px; font-size: 15px; outline: none; transition: 0.2s; background: white; }
.form-group input:focus, .form-group textarea:focus { box-shadow: 0 0 0 3px rgba(0,0,0,0.05); }
.btn-submit { width: 100%; padding: 16px; background: var(--accent-black); color: white; border: none; border-radius: 10px; font-size: 16px; font-weight: 600; cursor: pointer; display: flex; justify-content: center; gap: 10px; align-items: center; margin-top: 10px; transition: 0.2s; }
.btn-submit:hover { background: #333; }

/* Footer */
.footer { padding: 60px 0 30px; border-top: 1px solid var(--border-light); background: var(--footer-bg); color: var(--footer-text); margin-top: 0; }
.footer-content { display: flex; justify-content: space-between; margin-bottom: 40px; }
.footer-brand .logo.white { color: white; }
.footer-links { display: flex; gap: 60px; }
.footer-column h4 { font-size: 12px; text-transform: uppercase; color: white; margin-bottom: 16px; }
.footer-column a { display: block; text-decoration: none; color: var(--footer-text); margin-bottom: 10px; font-size: 14px; }
.footer-column a:hover { color: white; }
.footer-bottom { text-align: center; font-size: 12px; border-top: 1px solid #333; padding-top: 20px; }

@media (max-width: 768px) {
    .hero h1 { font-size: 42px; }
    .system-grid, .features-grid, .contact-grid { grid-template-columns: 1fr; }
    .nav-links { display: none; position: absolute; top: 60px; left: 0; width: 100%; background: white; flex-direction: column; padding: 20px; box-shadow: var(--shadow); }
    .nav-links.active { display: flex; }
    .mobile-menu-btn { display: flex; }
    .footer-content { flex-direction: column; gap: 40px; }
    .footer-links { flex-wrap: wrap; gap: 30px; }
    .whatsapp-float .wa-text { display: none; }
    
    /* FAQ Mobile */
    .faq-question { font-size: 15px; padding: 20px; }
    .faq-answer p { padding: 0 20px 20px; font-size: 14px; }
    .faq-icon { width: 18px; height: 18px; }
}