/* ===== CSS Variables ===== */
:root {
    --color-primary: #1a365d;
    --color-primary-light: #2a4a7f;
    --color-accent: #63b3ed;
    --color-accent-light: #90cdf4;
    --color-bg: #ffffff;
    --color-bg-alt: #f7fafc;
    --color-bg-dark: #0f1729;
    --color-text: #2d3748;
    --color-text-light: #718096;
    --color-text-muted: #a0aec0;
    --color-border: #e2e8f0;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 10px 10px -5px rgba(0,0,0,.04);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --transition: all 0.3s ease;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body { font-family: var(--font-family); color: var(--color-text); background: var(--color-bg); line-height: 1.6; overflow-x: hidden; }
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.95); backdrop-filter: blur(10px); border-bottom: 1px solid var(--color-border); transition: var(--transition); }
.header.scrolled { box-shadow: var(--shadow-md); }
.header-content { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 12px; }
.logo-icon { width: 40px; height: 40px; color: var(--color-primary); }
.logo-text { font-size: 1.25rem; font-weight: 700; color: var(--color-primary); }
.logo-highlight { color: var(--color-accent); }
.nav-list { display: flex; align-items: center; gap: 32px; }
.nav-link { font-size: 0.9rem; font-weight: 500; color: var(--color-text-light); transition: var(--transition); }
.nav-link:hover { color: var(--color-primary); }
.mobile-menu-btn { display: none; width: 32px; height: 24px; flex-direction: column; justify-content: space-between; }
.mobile-menu-btn span { display: block; width: 100%; height: 2px; background: var(--color-primary); transition: var(--transition); }

/* ===== Hero ===== */
.hero { position: relative; min-height: 100vh; display: flex; align-items: center; background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-primary) 100%); overflow: hidden; padding-top: 72px; }
.hero-bg { position: absolute; inset: 0; background: url('assets/hero-bg.png') center/cover no-repeat; opacity: 0.15; }
.hero-particles { position: absolute; inset: 0; pointer-events: none; }
.hero-content { position: relative; max-width: 800px; text-align: center; margin: 0 auto; }
.hero-title { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 700; color: #fff; line-height: 1.2; margin-bottom: 24px; }
.hero-subtitle { font-size: clamp(1rem, 2vw, 1.25rem); color: rgba(255,255,255,0.8); margin-bottom: 40px; }
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 32px; border-radius: var(--radius-md); font-weight: 600; font-size: 1rem; transition: var(--transition); }
.btn-primary { background: var(--color-accent); color: var(--color-primary); }
.btn-primary:hover { background: var(--color-accent-light); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.btn-icon { width: 20px; height: 20px; }
.btn-full { width: 100%; justify-content: center; }

/* ===== Sections ===== */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-tag { display: inline-block; padding: 6px 16px; background: var(--color-accent); color: var(--color-primary); font-size: 0.75rem; font-weight: 600; text-transform: uppercase; letter-spacing: 1px; border-radius: 20px; margin-bottom: 16px; }
.section-title { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; color: var(--color-primary); }

/* ===== About Section ===== */
.section-about { background: var(--color-bg-alt); }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.about-text { font-size: 1.125rem; color: var(--color-text); line-height: 1.8; margin-bottom: 32px; }
.about-quote { position: relative; padding: 24px 32px; background: #fff; border-left: 4px solid var(--color-accent); border-radius: var(--radius-md); box-shadow: var(--shadow-md); }
.quote-icon { width: 32px; height: 32px; color: var(--color-accent); opacity: 0.5; margin-bottom: 8px; }
.about-quote p { font-size: 1.125rem; font-style: italic; color: var(--color-primary); font-weight: 500; }
.about-features { display: flex; flex-direction: column; gap: 24px; }
.feature-card { padding: 24px; background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); transition: var(--transition); }
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); }
.feature-icon { width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-light) 100%); border-radius: var(--radius-md); margin-bottom: 16px; }
.feature-icon svg { width: 24px; height: 24px; color: var(--color-primary); }
.feature-card h3 { font-size: 1.125rem; font-weight: 600; color: var(--color-primary); margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--color-text-light); }

/* ===== How Section ===== */
.how-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.how-steps { display: flex; flex-direction: column; gap: 32px; }
.step { display: flex; gap: 24px; }
.step-number { flex-shrink: 0; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%); color: #fff; font-size: 1rem; font-weight: 700; border-radius: 50%; }
.step-content h3 { font-size: 1.125rem; font-weight: 600; color: var(--color-primary); margin-bottom: 8px; }
.step-content p { font-size: 0.95rem; color: var(--color-text-light); line-height: 1.7; }
.interface-mockup { background: var(--color-bg-dark); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-xl); }
.interface-header { display: flex; align-items: center; gap: 12px; padding: 16px 20px; background: rgba(0,0,0,0.3); }
.interface-dots { display: flex; gap: 8px; }
.interface-dots span { width: 12px; height: 12px; border-radius: 50%; }
.interface-dots span:nth-child(1) { background: #ff5f56; }
.interface-dots span:nth-child(2) { background: #ffbd2e; }
.interface-dots span:nth-child(3) { background: #27c93f; }
.interface-title { font-size: 0.8rem; color: rgba(255,255,255,0.6); }
.interface-body { padding: 24px; }
.interface-widget { background: rgba(255,255,255,0.05); border-radius: var(--radius-md); padding: 16px; margin-bottom: 20px; }
.widget-header { font-size: 0.75rem; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 8px; }
.widget-status { display: flex; align-items: center; gap: 8px; color: #27c93f; font-size: 0.9rem; font-weight: 500; }
.status-dot { width: 8px; height: 8px; background: #27c93f; border-radius: 50%; animation: pulse 2s infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
.interface-buttons { display: flex; flex-direction: column; gap: 12px; }
.interface-btn { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: var(--radius-md); font-size: 0.85rem; font-weight: 500; transition: var(--transition); }
.interface-btn svg { width: 16px; height: 16px; }
.btn-activate { background: rgba(39,201,63,0.2); color: #27c93f; border: 1px solid rgba(39,201,63,0.3); }
.btn-pause { background: rgba(255,189,46,0.2); color: #ffbd2e; border: 1px solid rgba(255,189,46,0.3); }
.btn-report { background: rgba(99,179,237,0.2); color: var(--color-accent); border: 1px solid rgba(99,179,237,0.3); }
.interface-btn:hover { transform: translateX(4px); }

/* ===== Profile Section ===== */
.section-profile { background: var(--color-bg-alt); }
.profile-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; margin-bottom: 48px; }
.profile-card { padding: 32px; background: #fff; border-radius: var(--radius-lg); box-shadow: var(--shadow-md); text-align: center; transition: var(--transition); }
.profile-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-xl); }
.profile-icon { width: 72px; height: 72px; margin: 0 auto 24px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%); border-radius: 50%; }
.profile-icon svg { width: 32px; height: 32px; color: #fff; }
.profile-card h3 { font-size: 1.125rem; font-weight: 600; color: var(--color-primary); margin-bottom: 12px; }
.profile-card p { font-size: 0.9rem; color: var(--color-text-light); line-height: 1.7; }
.profile-quote { text-align: center; padding: 32px; background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%); border-radius: var(--radius-lg); }
.profile-quote p { font-size: 1.5rem; font-weight: 600; color: #fff; font-style: italic; }

/* ===== Infrastructure Section ===== */
.infrastructure-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.infrastructure-content p { font-size: 1.125rem; color: var(--color-text); line-height: 1.8; margin-bottom: 32px; }
.infrastructure-stats { display: flex; gap: 40px; margin-bottom: 32px; }
.stat { text-align: center; }
.stat-number { display: block; font-size: 2rem; font-weight: 700; color: var(--color-primary); }
.stat-label { font-size: 0.85rem; color: var(--color-text-light); }
.infrastructure-list { display: flex; flex-direction: column; gap: 16px; }
.infrastructure-list li { display: flex; align-items: center; gap: 12px; font-size: 0.95rem; color: var(--color-text); }
.infrastructure-list svg { width: 20px; height: 20px; color: var(--color-accent); flex-shrink: 0; }
.infrastructure-image { position: relative; border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-xl); }
.infrastructure-image img { width: 100%; height: 400px; object-fit: cover; }
.image-overlay { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(26,54,93,0.3) 0%, rgba(99,179,237,0.2) 100%); }

/* ===== Activation Section ===== */
.section-activation { background: var(--color-bg-alt); }
.activation-card { display: flex; gap: 32px; padding: 48px; background: #fff; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); border: 1px solid var(--color-border); }
.activation-icon { flex-shrink: 0; width: 80px; height: 80px; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%); border-radius: var(--radius-lg); }
.activation-icon svg { width: 40px; height: 40px; color: #fff; }
.activation-content h3 { font-size: 1.5rem; font-weight: 700; color: var(--color-primary); margin-bottom: 16px; }
.activation-content p { font-size: 1rem; color: var(--color-text); line-height: 1.8; margin-bottom: 12px; }
.activation-note { font-size: 0.9rem !important; color: var(--color-text-light) !important; font-style: italic; }

/* ===== Transparency Section ===== */
.transparency-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; margin-bottom: 48px; }
.disclaimer-card { display: flex; align-items: flex-start; gap: 16px; padding: 24px; background: var(--color-bg-alt); border-radius: var(--radius-lg); border: 1px solid var(--color-border); }
.disclaimer-icon { flex-shrink: 0; width: 48px; height: 48px; display: flex; align-items: center; justify-content: center; background: rgba(99,179,237,0.1); border-radius: 50%; }
.disclaimer-icon svg { width: 24px; height: 24px; color: var(--color-primary); }
.disclaimer-card p { font-size: 0.95rem; color: var(--color-text); line-height: 1.6; }
.terms-links { display: flex; justify-content: center; gap: 32px; }
.terms-link { display: flex; align-items: center; gap: 8px; padding: 12px 24px; background: var(--color-primary); color: #fff; border-radius: var(--radius-md); font-weight: 500; transition: var(--transition); }
.terms-link svg { width: 18px; height: 18px; }
.terms-link:hover { background: var(--color-primary-light); transform: translateY(-2px); }

/* ===== Contact Section ===== */
.section-contact { background: var(--color-bg-alt); }
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.contact-info h2 { font-size: 2rem; font-weight: 700; color: var(--color-primary); margin-bottom: 16px; }
.contact-info > p { font-size: 1rem; color: var(--color-text-light); line-height: 1.7; margin-bottom: 32px; }
.contact-details { display: flex; flex-direction: column; gap: 20px; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; }
.contact-item svg { width: 24px; height: 24px; color: var(--color-accent); flex-shrink: 0; margin-top: 2px; }
.contact-item span { font-size: 0.95rem; color: var(--color-text); }
.contact-form-wrapper { background: #fff; padding: 40px; border-radius: var(--radius-xl); box-shadow: var(--shadow-lg); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; color: var(--color-text); margin-bottom: 8px; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 14px 16px; border: 1px solid var(--color-border); border-radius: var(--radius-md); font-size: 1rem; font-family: inherit; transition: var(--transition); }
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--color-accent); box-shadow: 0 0 0 3px rgba(99,179,237,0.2); }
.form-group textarea { resize: vertical; min-height: 100px; }

/* ===== Footer ===== */
.footer { background: var(--color-bg-dark); color: #fff; padding: 60px 0 24px; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 48px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand .logo-icon { color: var(--color-accent); }
.footer-brand .logo-text { color: #fff; }
.footer-brand .logo-highlight { color: var(--color-accent); }
.footer-description { font-size: 0.9rem; color: rgba(255,255,255,0.6); line-height: 1.7; }
.footer-links h4, .footer-contact h4 { font-size: 1rem; font-weight: 600; margin-bottom: 20px; color: #fff; }
.footer-links ul { display: flex; flex-direction: column; gap: 12px; }
.footer-links a { font-size: 0.9rem; color: rgba(255,255,255,0.6); transition: var(--transition); }
.footer-links a:hover { color: var(--color-accent); }
.footer-contact p { font-size: 0.9rem; color: rgba(255,255,255,0.6); margin-bottom: 8px; }
.footer-contact a { color: var(--color-accent); }
.footer-contact a:hover { text-decoration: underline; }
.footer-bottom { padding-top: 24px; border-top: 1px solid rgba(255,255,255,0.1); text-align: center; }
.copyright { font-size: 0.85rem; color: rgba(255,255,255,0.5); margin-bottom: 8px; }
.compliance-notice { font-size: 0.75rem; color: rgba(255,255,255,0.4); max-width: 600px; margin: 0 auto; }

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .about-grid, .how-grid, .infrastructure-grid, .contact-grid { grid-template-columns: 1fr; gap: 40px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    .nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: #fff; padding: 24px; border-top: 1px solid var(--color-border); box-shadow: var(--shadow-lg); }
    .nav.active { display: block; }
    .nav-list { flex-direction: column; gap: 16px; }
    .mobile-menu-btn { display: flex; }
    .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(7px, -6px); }
    .profile-grid { grid-template-columns: 1fr; }
    .transparency-grid { grid-template-columns: 1fr; }
    .terms-links { flex-direction: column; align-items: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .activation-card { flex-direction: column; text-align: center; }
    .activation-icon { margin: 0 auto; }
    .infrastructure-stats { justify-content: center; flex-wrap: wrap; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .section { padding: 60px 0; }
    .hero { padding-top: 60px; }
    .btn { padding: 14px 24px; font-size: 0.9rem; width: 100%; justify-content: center; }
    .contact-form-wrapper { padding: 24px; }
}