/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    color: #1a1a2e;
    background: #ffffff;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; }
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}
.section-header h2 {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}
.section-header p {
    font-size: 18px;
    color: #555;
    line-height: 1.7;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 14px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 16px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: 2px solid transparent;
    font-family: inherit;
}
.btn-primary {
    background: #1a1a2e;
    color: #fff;
}
.btn-primary:hover {
    background: #16213e;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(26,26,46,0.2);
}
.btn-outline {
    background: transparent;
    color: #1a1a2e;
    border-color: #1a1a2e;
}
.btn-outline:hover {
    background: #1a1a2e;
    color: #fff;
    transform: translateY(-2px);
}
.btn-large { padding: 18px 40px; font-size: 18px; }
.btn-small { padding: 10px 20px; font-size: 14px; border-radius: 8px; }

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: all 0.3s ease;
}
.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 22px;
}
.logo-icon {
    font-size: 20px;
    color: #4a90d9;
}
.logo-highlight { color: #4a90d9; }

/* Navigation */
.nav-list {
    display: flex;
    gap: 32px;
    align-items: center;
}
.nav-list a {
    font-size: 15px;
    font-weight: 500;
    color: #555;
    transition: color 0.2s;
    position: relative;
}
.nav-list a:hover,
.nav-list a.active { color: #1a1a2e; }
.nav-list a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: #4a90d9;
    transition: width 0.3s;
}
.nav-list a:hover::after,
.nav-list a.active::after { width: 100%; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #1a1a2e;
    transition: all 0.3s;
    border-radius: 2px;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4f8 50%, #fef9f0 100%);
    z-index: -1;
}
.hero-bg::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(74,144,217,0.08) 0%, transparent 70%);
}
.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-content { max-width: 560px; }
.hero-badge {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 100px;
    background: rgba(74,144,217,0.1);
    color: #4a90d9;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.5px;
    margin-bottom: 24px;
}
.hero-content h1 {
    font-size: clamp(40px, 5.5vw, 64px);
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}
.hero-content p {
    font-size: 18px;
    color: #555;
    line-height: 1.7;
    margin-bottom: 32px;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Hero Visual Cards */
.hero-visual {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 20px;
    align-items: center;
}
.hero-card {
    background: #fff;
    border-radius: 20px;
    padding: 28px 36px;
    box-shadow: 0 4px 32px rgba(0,0,0,0.06);
    text-align: center;
    border: 1px solid rgba(0,0,0,0.04);
    width: 100%;
    max-width: 340px;
}
.hero-card-temp {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}
.hero-temp-before {
    font-size: 42px;
    font-weight: 800;
    color: #e74c3c;
}
.hero-temp-arrow {
    font-size: 28px;
    color: #999;
}
.hero-temp-after {
    font-size: 42px;
    font-weight: 800;
    color: #4a90d9;
}
.hero-temp-label {
    width: 100%;
    font-size: 14px;
    color: #888;
    font-weight: 500;
}
.hero-uv-value {
    font-size: 36px;
    font-weight: 800;
    color: #1a1a2e;
    display: block;
}
.hero-uv-label {
    font-size: 14px;
    color: #888;
    font-weight: 500;
}

/* ===== Stats ===== */
.stats {
    background: #1a1a2e;
    padding: 48px 0;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.stat-item {
    text-align: center;
    color: #fff;
}
.stat-number {
    display: block;
    font-size: 36px;
    font-weight: 800;
    letter-spacing: -0.02em;
}
.stat-label {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    font-weight: 400;
}

/* ===== Product Cards ===== */
.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.product-card {
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid rgba(0,0,0,0.06);
    transition: all 0.4s ease;
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 48px rgba(0,0,0,0.08);
}
.product-card-featured {
    border-color: rgba(74,144,217,0.3);
    box-shadow: 0 4px 24px rgba(74,144,217,0.1);
}
.product-card-image {
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8faff 0%, #eef6fc 100%);
    position: relative;
    font-size: 60px;
}
.product-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    border-radius: 100px;
    background: #4a90d9;
    color: #fff;
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.3px;
    text-transform: uppercase;
}
.product-card-body { padding: 24px; }
.product-card-body h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}
.product-card-body > p {
    font-size: 14px;
    color: #666;
    line-height: 1.6;
    margin-bottom: 16px;
}
.product-features {
    margin-bottom: 20px;
}
.product-features li {
    font-size: 13px;
    color: #555;
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}
.product-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #4a90d9;
    font-weight: 700;
}

/* ===== Compare ===== */
.compare-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
    max-width: 800px;
    margin: 0 auto;
}
.compare-card {
    padding: 36px;
    border-radius: 20px;
    border: 1px solid rgba(0,0,0,0.06);
}
.compare-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 20px;
}
.compare-card li {
    padding: 8px 0;
    font-size: 15px;
    line-height: 1.5;
}
.compare-bad {
    background: #fff5f5;
    border-color: #fed7d7;
}
.compare-good {
    background: #f0faf0;
    border-color: #c6f6d5;
}

/* ===== Testimonials ===== */
.testimonial-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.testimonial-card {
    padding: 32px;
    background: #f8f9fc;
    border-radius: 16px;
    border: 1px solid rgba(0,0,0,0.04);
}
.testimonial-stars {
    color: #f6b83e;
    font-size: 18px;
    margin-bottom: 16px;
}
.testimonial-card p {
    font-size: 15px;
    color: #444;
    line-height: 1.7;
    margin-bottom: 16px;
    font-style: italic;
}
.testimonial-author {
    font-size: 13px;
    color: #888;
    font-weight: 500;
}

/* ===== CTA ===== */
.cta {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #fff;
    text-align: center;
}
.cta h2 {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    margin-bottom: 16px;
}
.cta p {
    font-size: 18px;
    color: rgba(255,255,255,0.7);
    max-width: 600px;
    margin: 0 auto 32px;
}
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.cta .btn-outline {
    color: #fff;
    border-color: rgba(255,255,255,0.3);
}
.cta .btn-outline:hover {
    background: #fff;
    color: #1a1a2e;
    border-color: #fff;
}

/* ===== Footer ===== */
.footer {
    background: #f8f9fc;
    border-top: 1px solid rgba(0,0,0,0.05);
    padding: 64px 0 32px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 48px;
}
.footer-brand p {
    font-size: 14px;
    color: #888;
    margin-top: 16px;
    line-height: 1.7;
    max-width: 320px;
}
.footer-links h4 {
    font-size: 14px;
    font-weight: 700;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: #1a1a2e;
}
.footer-links li { margin-bottom: 10px; }
.footer-links a {
    font-size: 14px;
    color: #666;
    transition: color 0.2s;
}
.footer-links a:hover { color: #4a90d9; }
.footer-bottom {
    border-top: 1px solid rgba(0,0,0,0.06);
    padding-top: 24px;
    text-align: center;
}
.footer-bottom p {
    font-size: 13px;
    color: #999;
}

/* ===== Inner Pages ===== */
.page-hero {
    padding: 140px 0 60px;
    background: linear-gradient(135deg, #f0f7ff 0%, #e8f4f8 100%);
    text-align: center;
}
.page-hero h1 {
    font-size: clamp(36px, 4vw, 52px);
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 12px;
}
.page-hero p {
    font-size: 18px;
    color: #555;
    max-width: 600px;
    margin: 0 auto;
}

/* Products Page Detail */
.product-detail { padding: 80px 0; border-bottom: 1px solid rgba(0,0,0,0.06); }
.product-detail:last-child { border-bottom: none; }
.product-detail .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.product-detail.reverse .container {
    direction: rtl;
}
.product-detail.reverse .container > * {
    direction: ltr;
}
.product-detail-visual {
    background: linear-gradient(135deg, #f8faff 0%, #eef6fc 100%);
    border-radius: 24px;
    padding: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 100px;
    min-height: 350px;
}
.product-detail-info h2 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 16px;
}
.product-detail-info .subtitle {
    font-size: 14px;
    color: #4a90d9;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}
.product-detail-info > p {
    font-size: 16px;
    color: #555;
    line-height: 1.7;
    margin-bottom: 24px;
}
.product-detail-specs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 24px;
}
.spec-item {
    padding: 12px 16px;
    background: #f8f9fc;
    border-radius: 8px;
    font-size: 14px;
}
.spec-item strong { display: block; font-weight: 600; color: #1a1a2e; }
.spec-item span { color: #666; font-size: 13px; }

/* Technology Page */
.tech-principle {
    padding: 80px 0;
    background: #f8f9fc;
}
.tech-principle .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.tech-visual {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    border-radius: 24px;
    padding: 60px 40px;
    color: #fff;
    text-align: center;
}
.tech-temp-chain {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 24px;
    margin: 32px 0;
    flex-wrap: wrap;
}
.tech-temp-item {
    text-align: center;
}
.tech-temp-item .temp {
    font-size: 28px;
    font-weight: 800;
}
.tech-temp-item .label {
    font-size: 12px;
    color: rgba(255,255,255,0.6);
    display: block;
    margin-top: 4px;
}
.tech-arrow {
    font-size: 24px;
    color: rgba(255,255,255,0.3);
}
.tech-wavelength {
    font-size: 13px;
    color: rgba(255,255,255,0.7);
    margin: 16px 0 8px;
    font-weight: 500;
}
.tech-principle h2 { font-size: 32px; font-weight: 700; margin-bottom: 16px; }
.tech-principle > .container > div > p {
    font-size: 16px;
    color: #555;
    line-height: 1.7;
    margin-bottom: 16px;
}
.tech-steps {
    counter-reset: step;
}
.tech-step {
    counter-increment: step;
    padding: 16px 0;
    padding-left: 48px;
    position: relative;
    border-left: 2px solid #e0e0e0;
    margin-left: 12px;
}
.tech-step:last-child { border-left-color: transparent; }
.tech-step::before {
    content: counter(step);
    position: absolute;
    left: -14px;
    top: 14px;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #4a90d9;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    font-weight: 700;
}
.tech-step h4 { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.tech-step p { font-size: 14px; color: #666; }

.tech-metrics {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
    padding: 80px 0;
}
.tech-metric {
    text-align: center;
    padding: 32px 16px;
    background: #f8f9fc;
    border-radius: 16px;
}
.tech-metric .value {
    font-size: 36px;
    font-weight: 800;
    color: #4a90d9;
    display: block;
}
.tech-metric .label {
    font-size: 14px;
    color: #666;
    margin-top: 8px;
    display: block;
}

/* About Page */
.about-content { padding: 80px 0; }
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: start;
}
.about-text h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 20px;
}
.about-text p {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
    margin-bottom: 16px;
}
.about-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}
.about-stat-card {
    padding: 28px;
    background: #f8f9fc;
    border-radius: 16px;
    text-align: center;
}
.about-stat-card .number {
    font-size: 32px;
    font-weight: 800;
    color: #4a90d9;
    display: block;
}
.about-stat-card .desc {
    font-size: 14px;
    color: #666;
    margin-top: 4px;
}

/* FAQ Page */
.faq-list { padding: 80px 0; max-width: 800px; margin: 0 auto; }
.faq-item {
    border-bottom: 1px solid rgba(0,0,0,0.06);
    padding: 20px 0;
}
.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    width: 100%;
    background: none;
    border: none;
    font-family: inherit;
    font-size: 17px;
    font-weight: 600;
    color: #1a1a2e;
    text-align: left;
    padding: 4px 0;
}
.faq-question::after {
    content: '+';
    font-size: 22px;
    color: #999;
    transition: transform 0.3s;
    flex-shrink: 0;
    margin-left: 16px;
}
.faq-item.active .faq-question::after {
    content: '−';
    transform: rotate(180deg);
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}
.faq-item.active .faq-answer {
    max-height: 300px;
    padding-top: 16px;
}
.faq-answer p {
    font-size: 15px;
    color: #555;
    line-height: 1.7;
}

/* Contact Page */
.contact-section { padding: 80px 0; }
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}
.contact-form { }
.contact-form h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
}
.form-group { margin-bottom: 20px; }
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 6px;
    color: #333;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #ddd;
    border-radius: 10px;
    font-family: inherit;
    font-size: 15px;
    transition: border-color 0.2s;
    background: #fff;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #4a90d9;
    box-shadow: 0 0 0 3px rgba(74,144,217,0.1);
}
.form-group textarea { min-height: 140px; resize: vertical; }
.contact-info h2 {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 24px;
}
.contact-info-item {
    display: flex;
    gap: 16px;
    padding: 16px 0;
    align-items: flex-start;
}
.contact-info-icon {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: #f0f7ff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}
.contact-info-item h4 { font-size: 15px; font-weight: 600; margin-bottom: 4px; }
.contact-info-item p { font-size: 14px; color: #666; line-height: 1.5; }

/* ===== Policy Pages ===== */
.policy-content { padding: 80px 0; max-width: 800px; margin: 0 auto; }
.policy-content h2 { font-size: 24px; font-weight: 700; margin: 32px 0 12px; }
.policy-content p { font-size: 15px; color: #555; line-height: 1.8; margin-bottom: 12px; }
.policy-content ul { margin: 12px 0 12px 24px; }
.policy-content li { font-size: 15px; color: #555; line-height: 1.7; margin-bottom: 6px; list-style: disc; }
.policy-content strong { color: #1a1a2e; }
.last-updated {
    font-size: 13px;
    color: #999;
    margin-bottom: 24px;
    display: block;
}

/* ===== Responsive ===== */
@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-content { max-width: 100%; }
    .hero-actions { justify-content: center; }
    .hero-visual { margin-top: 40px; }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .testimonial-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .product-detail .container {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .tech-principle .container {
        grid-template-columns: 1fr;
    }
    .tech-metrics { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 32px; }
    .compare-grid { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
    .product-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .hero { min-height: auto; padding: 100px 0 60px; }
    .nav-list {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 24px;
        gap: 16px;
        border-bottom: 1px solid rgba(0,0,0,0.06);
        box-shadow: 0 8px 32px rgba(0,0,0,0.08);
    }
    .nav-list.open { display: flex; }
    .nav-toggle { display: flex; }
    .tech-metrics { grid-template-columns: 1fr 1fr; }
    .product-detail-specs { grid-template-columns: 1fr; }
    .about-stats { grid-template-columns: 1fr; }
    .stats-grid { gap: 24px; }
}