* { box-sizing: border-box; margin: 0; padding: 0; }
body {
    font-family: 'Urbanist', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    color: #012D2D;
    line-height: 1.6;
    background: #FFFFFF;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }

/* ===== Header ===== */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(1, 45, 45, 0.08);
}
.header-inner {
    max-width: 1360px;
    margin: 0 auto;
    padding: 16px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}
.logo-link {
    display: flex;
    align-items: center;
    flex-shrink: 0;
}
.logo-link img {
    height: 40px;
    width: auto;
}
.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
    flex: 1;
    justify-content: flex-end;
    list-style: none;
}
.nav-menu > li > a {
    color: #012D2D;
    font-weight: 500;
    font-size: 16px;
    white-space: nowrap;
    transition: opacity 0.2s;
}
.nav-menu > li > a:hover { opacity: 0.7; }
.lang-picker {
    display: flex;
    align-items: center;
    gap: 8px;
    color: #012D2D;
    font-weight: 500;
    font-size: 16px;
    cursor: pointer;
    padding: 8px 12px;
    border-radius: 8px;
    transition: background 0.2s;
}
.lang-picker:hover { background: #F0F9FA; }
.lang-picker svg:first-child { width: 24px; height: 24px; }
.lang-picker .arrow { width: 16px; height: 16px; }
.download-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: #00797F;
    color: #FFFFFF !important;
    padding: 14px 28px;
    border-radius: 40px;
    font-weight: 600;
    font-size: 16px;
    transition: background 0.2s, transform 0.2s;
    border: none;
    cursor: pointer;
}
.download-btn:hover {
    background: #006066;
    transform: translateY(-1px);
}
.download-btn svg { width: 16px; height: 16px; }

@media (max-width: 900px) {
    .header-inner { padding: 14px 20px; }
    .nav-menu > li:nth-child(1),
    .nav-menu > li:nth-child(2),
    .nav-menu > li:nth-child(3),
    .nav-menu > li:nth-child(4) { display: none; }
    .download-btn { padding: 12px 20px; font-size: 14px; }
}

/* ===== Hero Section ===== */
.hero {
    background: linear-gradient(180deg, #E6F7F9 0%, #FFFFFF 100%);
    padding: 80px 32px 100px;
    position: relative;
    overflow: hidden;
}
.hero-inner {
    max-width: 1360px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.hero-label {
    display: inline-block;
    color: #006066;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 20px;
}
.hero h1 {
    font-size: clamp(40px, 5vw, 64px);
    font-weight: 700;
    color: #012D2D;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}
.hero-subtitle {
    font-size: clamp(16px, 1.5vw, 20px);
    color: #3E464E;
    font-weight: 400;
    margin-bottom: 40px;
    max-width: 520px;
    line-height: 1.5;
}
.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: #00797F;
    color: #FFFFFF;
    padding: 22px 36px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 8px 24px rgba(0, 121, 127, 0.25);
    margin-bottom: 32px;
    border: none;
    cursor: pointer;
}
.hero-cta:hover {
    background: #006066;
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(0, 121, 127, 0.35);
}
.hero-trust {
    display: flex;
    align-items: center;
    gap: 16px;
}
.hero-trust img {
    width: 48px;
    height: 48px;
    opacity: 0.9;
}
.hero-trust p {
    color: #3E464E;
    font-size: 16px;
}
.hero-trust strong { color: #012D2D; }
.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}
.hero-image img {
    max-width: 100%;
    width: 560px;
    height: auto;
    animation: float 6s ease-in-out infinite;
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

@media (max-width: 900px) {
    .hero { padding: 48px 20px 60px; }
    .hero-inner { grid-template-columns: 1fr; gap: 40px; }
    .hero-image { order: -1; }
    .hero-image img { max-width: 320px; }
}

/* ===== VPN Section ===== */
.vpn-section {
    background: #F8FAFB;
    padding: 100px 32px;
}
.section-inner {
    max-width: 1200px;
    margin: 0 auto;
}
.section-title {
    font-size: clamp(28px, 3.5vw, 44px);
    font-weight: 700;
    color: #012D2D;
    text-align: center;
    margin-bottom: 60px;
    line-height: 1.2;
    letter-spacing: -0.01em;
}
.vpn-diagram {
    background: #FFFFFF;
    border-radius: 24px;
    padding: 60px;
    margin-bottom: 40px;
    box-shadow: 0 4px 20px rgba(1, 45, 45, 0.06);
}
.vpn-diagram img {
    max-width: 700px;
    margin: 0 auto;
    width: 100%;
    height: auto;
}
.vpn-text {
    max-width: 800px;
    margin: 0 auto;
}
.vpn-text p {
    font-size: 17px;
    color: #3E464E;
    margin-bottom: 20px;
    line-height: 1.7;
}
.vpn-warning {
    display: flex;
    align-items: center;
    gap: 16px;
    background: #FFF8E6;
    border-left: 4px solid #F4B400;
    padding: 20px 24px;
    border-radius: 8px;
    margin: 24px 0;
}
.vpn-warning svg { flex-shrink: 0; }
.vpn-warning p { margin: 0; font-weight: 500; color: #012D2D; font-size: 17px; }

@media (max-width: 768px) {
    .vpn-section { padding: 60px 20px; }
    .vpn-diagram { padding: 30px; }
}

/* ===== Advantages Section ===== */
.advantages {
    background: #FFFFFF;
    padding: 100px 32px;
}
.adv-heading {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}
.adv-label {
    color: #006066;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}
.adv-title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    color: #012D2D;
    margin-bottom: 20px;
    line-height: 1.15;
    letter-spacing: -0.02em;
}
.adv-subtitle {
    font-size: 18px;
    color: #3E464E;
    line-height: 1.6;
}
.adv-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
    margin-top: 48px;
}
.adv-card {
    background: #F8FAFB;
    border-radius: 20px;
    padding: 40px 32px;
    transition: transform 0.3s, box-shadow 0.3s;
    border: 1px solid rgba(1, 45, 45, 0.05);
}
.adv-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(1, 45, 45, 0.08);
}
.adv-card-icon {
    width: 48px;
    height: 48px;
    background: #D5F6FA;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: #006066;
}
.adv-card-icon svg { width: 24px; height: 24px; }
.adv-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #006066;
    margin-bottom: 12px;
}
.adv-card p {
    color: #3E464E;
    font-size: 16px;
    line-height: 1.6;
}
.adv-cta {
    text-align: center;
    margin-top: 60px;
}
.adv-cta .btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: #00797F;
    color: #FFFFFF;
    padding: 22px 36px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 8px 24px rgba(0, 121, 127, 0.25);
    border: none;
    cursor: pointer;
}
.adv-cta .btn:hover {
    background: #006066;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .advantages { padding: 60px 20px; }
    .adv-cards { grid-template-columns: 1fr; }
}

/* ===== Devices Section ===== */
.devices {
    background: #F8FAFB;
    padding: 100px 32px;
}
.devices-list {
    display: flex;
    flex-wrap: wrap;
    gap: 20px;
    justify-content: center;
    margin-top: 40px;
}
.device-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    padding: 32px 36px;
    background: #FFFFFF;
    border-radius: 16px;
    min-width: 160px;
    transition: transform 0.2s, box-shadow 0.2s;
    border: 1px solid rgba(1, 45, 45, 0.05);
}
.device-link:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(1, 45, 45, 0.08);
}
.device-link svg { width: 36px; height: 36px; color: #012D2D; }
.device-link p { color: #012D2D; font-weight: 500; font-size: 15px; margin: 0; }

@media (max-width: 768px) {
    .devices { padding: 60px 20px; }
    .device-link { min-width: 130px; padding: 24px 20px; }
}

/* ===== Features Section ===== */
.features {
    background: #003C3F;
    color: #EFFDFF;
    padding: 100px 32px;
}
.features-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 80px;
    align-items: start;
}
.features-left h2 {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    color: #FFFFFF;
    margin-bottom: 32px;
    line-height: 1.15;
    letter-spacing: -0.02em;
}
.features-illustration {
    background: #D5F6FA;
    border-radius: 24px;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.features-illustration svg {
    width: 80%;
    height: 80%;
}
.features-list {
    display: flex;
    flex-direction: column;
    gap: 28px;
}
.feature-item {
    display: grid;
    grid-template-columns: 32px 1fr;
    gap: 20px;
    padding: 24px;
    background: rgba(213, 246, 250, 0.08);
    border-radius: 16px;
    border: 1px solid rgba(213, 246, 250, 0.15);
}
.feature-check {
    width: 32px;
    height: 32px;
    background: #D5F6FA;
    color: #003C3F;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.feature-check svg { width: 16px; height: 16px; }
.feature-item h4 {
    font-size: 18px;
    font-weight: 600;
    color: #EFFDFF;
    margin-bottom: 8px;
}
.feature-item p {
    color: #F8FAFB;
    font-size: 15px;
    line-height: 1.6;
    opacity: 0.9;
}

@media (max-width: 900px) {
    .features { padding: 60px 20px; }
    .features-inner { grid-template-columns: 1fr; gap: 48px; }
}

/* ===== CTA Section ===== */
.cta-banner {
    background: #FFFFFF;
    padding: 100px 32px;
}
.cta-inner {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}
.cta-inner h2 {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    color: #012D2D;
    margin-bottom: 20px;
    line-height: 1.2;
    letter-spacing: -0.02em;
}
.cta-inner h4 {
    font-size: 18px;
    font-weight: 400;
    color: #3E464E;
    margin-bottom: 40px;
}
.cta-inner .btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    background: #00797F;
    color: #FFFFFF;
    padding: 22px 36px;
    border-radius: 50px;
    font-size: 18px;
    font-weight: 600;
    transition: background 0.2s, transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 8px 24px rgba(0, 121, 127, 0.25);
    border: none;
    cursor: pointer;
}
.cta-inner .btn:hover { background: #006066; transform: translateY(-2px); }

@media (max-width: 768px) {
    .cta-banner { padding: 60px 20px; }
}

/* ===== Testimonials Section ===== */
.testimonials {
    background: #003C3F;
    color: #FFFFFF;
    padding: 100px 32px;
}
.testi-inner {
    max-width: 1200px;
    margin: 0 auto;
}
.testi-heading {
    text-align: center;
    margin-bottom: 60px;
}
.testi-label {
    color: #D5F6FA;
    font-size: 14px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}
.testi-heading h2 {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 700;
    color: #FFFFFF;
    line-height: 1.15;
    letter-spacing: -0.02em;
}
.testi-tabs {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 40px;
}
.testi-tab {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(213, 246, 250, 0.1);
    color: #EFFDFF;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: background 0.2s, border-color 0.2s;
}
.testi-tab.active {
    background: rgba(213, 246, 250, 0.2);
    border-color: #D5F6FA;
}
.testi-tab svg { width: 16px; height: 16px; }
.testi-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.testi-card {
    background: rgba(213, 246, 250, 0.08);
    border-radius: 20px;
    padding: 36px 32px;
    border: 1px solid rgba(213, 246, 250, 0.12);
    display: flex;
    flex-direction: column;
    gap: 24px;
    transition: transform 0.3s, background 0.3s;
}
.testi-card:hover {
    background: rgba(213, 246, 250, 0.12);
    transform: translateY(-4px);
}
.testi-quote {
    color: #EFFDFF;
    font-size: 17px;
    line-height: 1.6;
    flex: 1;
}
.testi-source {
    display: flex;
    align-items: center;
    gap: 16px;
    padding-top: 24px;
    border-top: 1px solid rgba(213, 246, 250, 0.15);
}
.testi-source svg { width: 28px; height: 28px; color: #EFFDFF; }
.testi-source p { color: #EFFDFF; font-size: 14px; font-weight: 500; }
.testi-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, #D5F6FA 0%, #A8E8ED 100%);
    margin-left: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: #003C3F;
}

@media (max-width: 900px) {
    .testimonials { padding: 60px 20px; }
    .testi-cards { grid-template-columns: 1fr; }
}

/* ===== Media Logos Section ===== */
.media-logos {
    background: #EFFDFF;
    padding: 80px 32px;
}
.media-grid {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 40px;
    align-items: center;
}
.media-item {
    display: flex;
    justify-content: center;
    align-items: center;
    color: #4A5568;
    font-size: 24px;
    font-weight: 700;
    letter-spacing: 1px;
    opacity: 0.7;
    transition: opacity 0.2s;
    padding: 16px;
}
.media-item:hover { opacity: 1; }
.media-item small { font-size: 16px; font-weight: 600; }

@media (max-width: 768px) {
    .media-logos { padding: 50px 20px; }
    .media-grid { grid-template-columns: repeat(2, 1fr); gap: 30px; }
}

/* ===== Footer ===== */
.footer {
    background: #012D2D;
    color: #EFFDFF;
    padding: 80px 32px 40px;
}
.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}
.footer-top {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 60px;
    border-bottom: 1px solid rgba(239, 253, 255, 0.1);
}
.footer-brand img {
    height: 48px;
    width: auto;
    margin-bottom: 24px;
    filter: brightness(0) invert(1);
}
.footer-brand p {
    color: rgba(239, 253, 255, 0.7);
    font-size: 15px;
    line-height: 1.6;
    max-width: 340px;
}
.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: #FFFFFF;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a {
    color: rgba(239, 253, 255, 0.7);
    font-size: 15px;
    transition: color 0.2s;
}
.footer-col ul li a:hover { color: #FFFFFF; }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 32px;
    flex-wrap: wrap;
    gap: 20px;
}
.footer-bottom p {
    color: rgba(239, 253, 255, 0.5);
    font-size: 14px;
}
.social-links {
    display: flex;
    gap: 16px;
}
.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(239, 253, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s, transform 0.2s;
}
.social-links a:hover {
    background: rgba(239, 253, 255, 0.2);
    transform: translateY(-2px);
}
.social-links svg { width: 18px; height: 18px; color: #EFFDFF; }

@media (max-width: 900px) {
    .footer { padding: 60px 20px 30px; }
    .footer-top { grid-template-columns: 1fr 1fr; gap: 40px; }
    .footer-brand { grid-column: 1 / -1; }
    .footer-bottom { flex-direction: column; text-align: center; }
}

/* ===== Animations ===== */
.fade-in {
    animation: fadeIn 0.8s ease-out;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}