/* ============ CSS Variables ============ */
:root {
    --color-primary: #0D47A1;
    --color-primary-dark: #002171;
    --color-primary-light: #5472d3;
    --color-secondary: #263238;
    --color-accent: #2962FF;
    --color-accent-light: #82B1FF;
    --color-success: #00C853;
    --color-warning: #FFAB00;
    --color-danger: #FF1744;
    --color-bg: #F5F7FA;
    --color-surface: #FFFFFF;
    --color-border: #E0E0E0;
    --color-text: #212121;
    --color-text-secondary: #616161;
    --color-text-light: #9E9E9E;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.12);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --nav-height: 64px;
}

/* ============ Reset ============ */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-surface);
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============ Buttons ============ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: var(--radius-md);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
    white-space: nowrap;
}

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 2px 12px rgba(41, 98, 255, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(41, 98, 255, 0.4);
}

.btn-outline {
    background: transparent;
    color: #fff;
    border: 1.5px solid rgba(255,255,255,0.5);
}

.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: #fff;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 13px;
}

.btn-full {
    width: 100%;
}

/* ============ Navbar ============ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.navbar.scrolled {
    box-shadow: var(--shadow-sm);
    border-bottom-color: var(--color-border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}

.logo-main {
    font-size: 18px;
    font-weight: 600;
    color: var(--color-primary);
}

.logo-sub {
    font-size: 10px;
    color: var(--color-text-light);
    letter-spacing: 1px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-menu a {
    font-size: 15px;
    color: var(--color-text-secondary);
    transition: var(--transition);
    position: relative;
    padding: 8px 0;
}

.nav-menu a:hover {
    color: var(--color-primary);
}

.nav-menu a.nav-highlight {
    color: var(--color-accent);
    font-weight: 500;
}

.nav-menu a.nav-highlight::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
}

.nav-cta {
    background: var(--color-accent);
    color: #fff !important;
    padding: 8px 24px !important;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.nav-cta:hover {
    background: var(--color-primary);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 1px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============ Hero ============ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: var(--nav-height);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #0D1B2A 0%, #1B2D4F 30%, #0D47A1 70%, #1565C0 100%);
}

.hero-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(circle at 20% 80%, rgba(41, 98, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(0, 200, 83, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(130, 177, 255, 0.08) 0%, transparent 70%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 40px 40px;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: #fff;
    max-width: 800px;
    padding: 40px 24px;
}

.hero-badge {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(41, 98, 255, 0.2);
    border: 1px solid rgba(130, 177, 255, 0.4);
    border-radius: 100px;
    font-size: 13px;
    color: #82B1FF;
    margin-bottom: 24px;
    backdrop-filter: blur(8px);
}

.hero-title {
    font-size: 48px;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: -0.5px;
}

.hero-title .accent {
    background: linear-gradient(90deg, #64B5F6, #82B1FF, #B388FF);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 17px;
    color: rgba(255,255,255,0.75);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 60px;
}

.hero-stats {
    display: flex;
    gap: 48px;
    justify-content: center;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-num {
    font-size: 36px;
    font-weight: 600;
    color: #82B1FF;
    line-height: 1;
}

.stat-label {
    font-size: 14px;
    color: rgba(255,255,255,0.6);
    margin-top: 8px;
}

.hero-scroll {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: rgba(255,255,255,0.5);
    font-size: 12px;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.3);
    margin: 12px auto 0;
    overflow: hidden;
    position: relative;
}

.scroll-line::after {
    content: '';
    position: absolute;
    top: -100%;
    left: 0;
    width: 100%;
    height: 50%;
    background: rgba(255,255,255,0.8);
    animation: scrollDown 2s ease-in-out infinite;
}

@keyframes scrollDown {
    0% { top: -100%; }
    100% { top: 200%; }
}

/* ============ Section Header ============ */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-tag {
    display: inline-block;
    padding: 4px 16px;
    background: rgba(41, 98, 255, 0.1);
    color: var(--color-accent);
    font-size: 13px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 32px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

.section-desc {
    font-size: 16px;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ============ Risk Section ============ */
.risk-section {
    padding: 100px 0;
    background: var(--color-bg);
}

.risk-architecture {
    max-width: 900px;
    margin: 0 auto 60px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
}

.arch-layer {
    width: 100%;
    padding: 24px;
    border-radius: var(--radius-lg);
    text-align: center;
}

.arch-top {
    background: linear-gradient(135deg, #E3F2FD, #BBDEFB);
    border: 1px solid #90CAF9;
}

.arch-mid {
    background: #fff;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}

.arch-bottom {
    background: linear-gradient(135deg, #FFF3E0, #FFE0B2);
    border: 1px solid #FFCC80;
}

.arch-label {
    font-size: 14px;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.arch-content {
    font-size: 14px;
    color: var(--color-text-secondary);
}

.arch-connector {
    width: 2px;
    height: 24px;
    background: var(--color-border);
}

.arch-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    margin-top: 16px;
}

.arch-card {
    padding: 16px 12px;
    border-radius: var(--radius-md);
    background: var(--color-bg);
    text-align: center;
    transition: var(--transition);
}

.arch-card:hover {
    background: #E3F2FD;
    transform: translateY(-2px);
}

.arch-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 18px;
    margin: 0 auto 12px;
}

.arch-card h4 {
    font-size: 15px;
    margin-bottom: 8px;
}

.arch-card p {
    font-size: 12px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.risk-features {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.feature-item {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.feature-item:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.feature-num {
    font-size: 28px;
    font-weight: 700;
    color: rgba(41, 98, 255, 0.15);
    margin-bottom: 12px;
}

.feature-item h4 {
    font-size: 17px;
    margin-bottom: 8px;
    color: var(--color-text);
}

.feature-item p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============ Products ============ */
.products-section {
    padding: 100px 0;
    background: #fff;
}

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

.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.product-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
    border-color: var(--color-accent);
}

.product-featured {
    border: 2px solid var(--color-accent);
    background: linear-gradient(135deg, #fff, #F5F7FF);
}

.product-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 4px 12px;
    background: var(--color-accent);
    color: #fff;
    font-size: 11px;
    border-radius: 100px;
}

.product-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 20px;
}

.product-card h3 {
    font-size: 22px;
    margin-bottom: 4px;
}

.product-tagline {
    font-size: 14px;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.product-features {
    margin-bottom: 20px;
}

.product-features li {
    font-size: 14px;
    color: var(--color-text-secondary);
    padding: 6px 0;
    padding-left: 24px;
    position: relative;
    border-bottom: 1px solid #f0f0f0;
}

.product-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 12px;
    width: 14px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
}

.product-price {
    font-size: 14px;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 16px;
    padding: 8px 0;
    border-top: 1px solid var(--color-border);
}

/* ============ Advantages ============ */
.advantages-section {
    padding: 100px 0;
    background: var(--color-bg);
}

.advantage-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-card {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--color-accent);
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.adv-number {
    font-size: 36px;
    font-weight: 700;
    color: rgba(13, 71, 161, 0.1);
    margin-bottom: 16px;
}

.advantage-card h4 {
    font-size: 18px;
    margin-bottom: 12px;
    color: var(--color-text);
}

.advantage-card p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============ Cases ============ */
.cases-section {
    padding: 100px 0;
    background: #fff;
}

.case-filters {
    display: flex;
    gap: 12px;
    justify-content: center;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 8px 24px;
    border: 1px solid var(--color-border);
    border-radius: 100px;
    background: transparent;
    color: var(--color-text-secondary);
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.filter-btn:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.filter-btn.active {
    background: var(--color-accent);
    color: #fff;
    border-color: var(--color-accent);
}

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

.case-card {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    background: #fff;
}

.case-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.case-image {
    height: 200px;
    position: relative;
    overflow: hidden;
}

.case-bg-1 { background: linear-gradient(135deg, #1565C0, #42A5F5); }
.case-bg-2 { background: linear-gradient(135deg, #00838F, #26C6DA); }
.case-bg-3 { background: linear-gradient(135deg, #6A1B9A, #AB47BC); }
.case-bg-4 { background: linear-gradient(135deg, #2E7D32, #66BB6A); }
.case-bg-5 { background: linear-gradient(135deg, #E65100, #FF9800); }
.case-bg-6 { background: linear-gradient(135deg, #283593, #5C6BC0); }

.case-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 40%, rgba(0,0,0,0.5) 100%);
    display: flex;
    align-items: flex-end;
    padding: 16px;
}

.case-cat {
    padding: 4px 12px;
    background: rgba(255,255,255,0.9);
    color: var(--color-text);
    font-size: 12px;
    border-radius: 100px;
}

.case-body {
    padding: 24px;
}

.case-body h3 {
    font-size: 18px;
    margin-bottom: 12px;
}

.case-body p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.case-tags {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.case-tags span {
    padding: 3px 10px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-size: 12px;
    color: var(--color-text-secondary);
}

.case-card.hidden {
    display: none;
}

/* ============ About ============ */
.about-section {
    padding: 100px 0;
    background: var(--color-bg);
}

.about-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 48px;
}

.about-text {
    font-size: 15px;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}

.about-text strong {
    color: var(--color-primary);
}

.about-vision {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 32px;
}

.vision-item {
    padding: 20px;
    background: #fff;
    border-radius: var(--radius-md);
    text-align: center;
}

.vision-item h4 {
    font-size: 14px;
    color: var(--color-accent);
    margin-bottom: 8px;
}

.vision-item p {
    font-size: 13px;
    color: var(--color-text-secondary);
}

.about-cert {
    background: #fff;
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-sm);
}

.cert-header h3 {
    font-size: 18px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--color-border);
}

.cert-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.cert-item {
    display: flex;
    gap: 16px;
    align-items: center;
}

.cert-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

.cert-info h4 {
    font-size: 14px;
    margin-bottom: 2px;
}

.cert-info p {
    font-size: 12px;
    color: var(--color-text-light);
}

/* ============ Contact ============ */
.contact-section {
    padding: 100px 0;
    background: #fff;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon-wrap {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    background: var(--color-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon-addr {
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5a2.5 2.5 0 010-5 2.5 2.5 0 010 5z'/%3E%3C/svg%3E") no-repeat center / contain;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5a2.5 2.5 0 010-5 2.5 2.5 0 010 5z'/%3E%3C/svg%3E") no-repeat center / contain;
}

.contact-icon-phone {
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6.62 10.79c1.44 2.83 3.76 5.14 6.59 6.59l2.2-2.2c.27-.27.67-.36 1.02-.24 1.12.37 2.33.57 3.57.57.55 0 1 .45 1 1V20c0 .55-.45 1-1 1-9.39 0-17-7.61-17-17 0-.55.45-1 1-1h3.5c.55 0 1 .45 1 1 0 1.25.2 2.45.57 3.57.11.35.03.74-.25 1.02l-2.2 2.2z'/%3E%3C/svg%3E") no-repeat center / contain;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M6.62 10.79c1.44 2.83 3.76 5.14 6.59 6.59l2.2-2.2c.27-.27.67-.36 1.02-.24 1.12.37 2.33.57 3.57.57.55 0 1 .45 1 1V20c0 .55-.45 1-1 1-9.39 0-17-7.61-17-17 0-.55.45-1 1-1h3.5c.55 0 1 .45 1 1 0 1.25.2 2.45.57 3.57.11.35.03.74-.25 1.02l-2.2 2.2z'/%3E%3C/svg%3E") no-repeat center / contain;
}

.contact-icon-mail {
    width: 20px;
    height: 20px;
    background: var(--color-accent);
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M20 4H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z'/%3E%3C/svg%3E") no-repeat center / contain;
    -webkit-mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath d='M20 4H4c-1.1 0-1.99.9-1.99 2L2 18c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4l-8 5-8-5V6l8 5 8-5v2z'/%3E%3C/svg%3E") no-repeat center / contain;
}

.contact-item h4 {
    font-size: 15px;
    margin-bottom: 4px;
}

.contact-item p {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.contact-qr {
    margin-top: 16px;
    text-align: center;
}

.qr-placeholder {
    display: inline-block;
    padding: 20px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.qr-code {
    width: 120px;
    height: 120px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 8px;
    position: relative;
}

.qr-code-large {
    width: 160px;
    height: 160px;
}

.qr-pattern {
    width: 100%;
    height: 100%;
    background-image:
        linear-gradient(45deg, #000 25%, transparent 25%),
        linear-gradient(-45deg, #000 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #000 75%),
        linear-gradient(-45deg, transparent 75%, #000 75%);
    background-size: 8px 8px;
    background-position: 0 0, 0 4px, 4px -4px, -4px 0px;
    opacity: 0.8;
    border-radius: 2px;
}

.qr-placeholder p {
    font-size: 13px;
    color: var(--color-text-secondary);
    margin-top: 8px;
}

/* Contact Form */
.contact-form-wrap {
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.contact-form h3 {
    font-size: 20px;
    margin-bottom: 24px;
    color: var(--color-text);
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    color: var(--color-text);
    margin-bottom: 6px;
    font-weight: 500;
}

.required {
    color: var(--color-danger);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    color: var(--color-text);
    background: #fff;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(41, 98, 255, 0.1);
}

.form-group textarea {
    resize: vertical;
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 400 !important;
    cursor: pointer;
    color: var(--color-text-secondary);
}

.checkbox-label input {
    width: auto !important;
    margin: 0;
}

.form-note {
    font-size: 12px;
    color: var(--color-text-light);
    text-align: center;
    margin-top: 12px;
}

/* ============ Footer ============ */
.footer {
    background: #1a1a2e;
    color: rgba(255,255,255,0.7);
    padding: 60px 0 24px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 48px;
    margin-bottom: 40px;
}

.footer-brand .footer-logo {
    margin-bottom: 16px;
}

.footer-brand .logo-main {
    color: #fff;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
}

.footer-col h4 {
    font-size: 15px;
    color: #fff;
    margin-bottom: 16px;
}

.footer-col ul li {
    margin-bottom: 10px;
}

.footer-col ul li a {
    font-size: 14px;
    color: rgba(255,255,255,0.5);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: #82B1FF;
}

.footer-col p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255,255,255,0.5);
}

.footer-bottom {
    padding-top: 24px;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    font-size: 13px;
    color: rgba(255,255,255,0.4);
}

.footer-bottom a {
    color: rgba(255,255,255,0.4);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: #82B1FF;
}

/* ============ Floating Registration ============ */
.float-register {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
}

.float-trigger {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 16px 12px;
    background: var(--color-accent);
    color: #fff;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    box-shadow: -4px 0 20px rgba(41, 98, 255, 0.3);
    writing-mode: vertical-rl;
    text-orientation: upright;
}

.float-trigger:hover {
    background: var(--color-primary);
    padding-right: 16px;
}

.float-icon {
    writing-mode: horizontal-tb;
    display: flex;
    flex-direction: column;
    gap: 3px;
}

.float-icon-bar {
    width: 18px;
    height: 2px;
    background: #fff;
    border-radius: 1px;
}

.float-text {
    font-size: 14px;
    font-weight: 500;
    letter-spacing: 2px;
    writing-mode: vertical-rl;
}

.float-panel {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(20px);
    width: 360px;
    background: #fff;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    overflow: hidden;
}

.float-panel.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

.float-panel-header {
    padding: 20px 24px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.float-panel-header h3 {
    font-size: 17px;
}

.float-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    opacity: 0.8;
    transition: var(--transition);
}

.float-close:hover {
    opacity: 1;
    transform: rotate(90deg);
}

.float-panel-body {
    padding: 24px;
    max-height: 500px;
    overflow-y: auto;
}

.float-qr-section {
    text-align: center;
    margin-bottom: 20px;
}

.float-qr-box {
    display: inline-block;
    padding: 12px;
    background: var(--color-bg);
    border-radius: var(--radius-md);
}

.float-qr-tip {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
    margin-top: 12px;
}

.float-qr-desc {
    font-size: 12px;
    color: var(--color-text-light);
    margin-top: 4px;
    line-height: 1.6;
}

.float-divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 20px 0;
}

.float-divider::before,
.float-divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--color-border);
}

.float-divider span {
    font-size: 12px;
    color: var(--color-text-light);
}

.float-form {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.float-form-group input,
.float-form-group select,
.float-form-group textarea {
    width: 100%;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    color: var(--color-text);
    background: #fff;
    transition: var(--transition);
    outline: none;
}

.float-form-group input:focus,
.float-form-group select:focus,
.float-form-group textarea:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(41, 98, 255, 0.1);
}

.float-form-group textarea {
    resize: vertical;
}

.float-select {
    cursor: pointer;
}

/* ============ Toast ============ */
.toast {
    position: fixed;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: 16px 32px;
    z-index: 2000;
    opacity: 0;
    transition: var(--transition);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.toast-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.toast-icon {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--color-success);
    position: relative;
}

.toast-icon::after {
    content: '';
    position: absolute;
    top: 6px;
    left: 8px;
    width: 6px;
    height: 10px;
    border: solid #fff;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.toast-text {
    font-size: 14px;
    color: var(--color-text);
    font-weight: 500;
}

/* ============ Back to Top ============ */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 998;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.arrow-up {
    width: 10px;
    height: 10px;
    border-left: 2px solid var(--color-text);
    border-top: 2px solid var(--color-text);
    transform: rotate(45deg);
    margin-top: 3px;
}

.back-to-top:hover .arrow-up {
    border-color: #fff;
}

/* ============ Scroll Animation ============ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============ Large Desktop (1440px+) ============ */
@media (min-width: 1440px) {
    :root { --max-width: 1320px; }
    .hero-title { font-size: 56px; }
    .hero-desc { font-size: 19px; }
    .stat-num { font-size: 44px; }
    .section-title { font-size: 38px; }
    .product-card { padding: 40px 32px; }
    .feature-item { padding: 40px 28px; }
    .advantage-card { padding: 44px 32px; }
    .container { padding: 0 32px; }
    .nav-container { padding: 0 32px; }
}

/* ============ Tablet Landscape (1025px - 1280px) ============ */
@media (max-width: 1280px) and (min-width: 1025px) {
    .hero-title { font-size: 42px; }
    .hero-stats { gap: 36px; }
    .product-grid { gap: 20px; }
    .risk-features { gap: 20px; }
}

/* ============ Tablet Portrait (769px - 1024px) ============ */
@media (max-width: 1024px) {
    .hero-title { font-size: 38px; }
    .hero { min-height: 90vh; }

    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .risk-features { grid-template-columns: repeat(2, 1fr); }
    .advantage-grid { grid-template-columns: repeat(2, 1fr); }
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .arch-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }

    .risk-section, .products-section, .advantages-section,
    .cases-section, .about-section, .contact-section {
        padding: 70px 0;
    }

    .section-header { margin-bottom: 40px; }

    .float-panel { width: 320px; }

    .hero-scroll { display: none; }
}

/* ============ Mobile (≤768px) ============ */
@media (max-width: 768px) {
    :root { --nav-height: 56px; }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 20px 24px;
        gap: 16px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        max-height: calc(100vh - var(--nav-height));
        overflow-y: auto;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu a {
        font-size: 16px;
        padding: 12px 0;
        border-bottom: 1px solid #f0f0f0;
    }

    .nav-menu a:last-child { border-bottom: none; }

    .nav-cta {
        text-align: center;
        margin-top: 8px;
    }

    .nav-toggle { display: flex; }

    .hero {
        min-height: 85vh;
        padding-top: var(--nav-height);
    }

    .hero-content { padding: 24px 20px; }

    .hero-badge {
        font-size: 12px;
        padding: 5px 16px;
        margin-bottom: 20px;
    }

    .hero-title {
        font-size: 26px;
        line-height: 1.35;
        margin-bottom: 18px;
    }

    .hero-desc {
        font-size: 15px;
        line-height: 1.7;
        margin-bottom: 32px;
    }

    .hero-actions {
        flex-direction: column;
        gap: 12px;
        margin-bottom: 40px;
    }

    .hero-actions .btn { width: 100%; }

    .hero-stats {
        gap: 20px;
        flex-wrap: wrap;
    }

    .stat-num { font-size: 26px; }
    .stat-label { font-size: 12px; }

    .section-header { margin-bottom: 32px; }
    .section-tag { font-size: 12px; }
    .section-title { font-size: 22px; }
    .section-desc { font-size: 14px; }

    .risk-section, .products-section, .advantages-section,
    .cases-section, .about-section, .contact-section {
        padding: 56px 0;
    }

    .container { padding: 0 16px; }

    .product-grid { grid-template-columns: 1fr; gap: 16px; }
    .risk-features { grid-template-columns: 1fr; gap: 16px; }
    .advantage-grid { grid-template-columns: 1fr; gap: 16px; }
    .case-grid { grid-template-columns: 1fr; gap: 16px; }
    .arch-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
    .about-vision { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .form-row { grid-template-columns: 1fr; }

    .product-card { padding: 24px 20px; }
    .feature-item { padding: 24px 20px; }
    .advantage-card { padding: 28px 20px; }
    .case-body { padding: 18px; }
    .case-body h3 { font-size: 16px; }

    .case-filters {
        gap: 8px;
        margin-bottom: 28px;
    }

    .filter-btn { padding: 6px 16px; font-size: 13px; }

    .float-panel {
        width: 100vw;
        right: 0;
        top: auto;
        bottom: 0;
        transform: translateY(100%);
        border-radius: var(--radius-lg) var(--radius-lg) 0 0;
        max-height: 85vh;
    }

    .float-panel.active {
        transform: translateY(0);
    }

    .float-panel-body {
        padding: 20px;
        max-height: calc(85vh - 60px);
    }

    .float-register {
        top: auto;
        bottom: 70px;
        transform: none;
    }

    .float-trigger {
        padding: 14px 10px;
        font-size: 13px;
    }

    .contact-form-wrap { padding: 20px; }
    .footer { padding: 40px 0 20px; }
    .footer-bottom {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 40px;
        height: 40px;
    }

    .toast {
        bottom: 20px;
        left: 16px;
        right: 16px;
        transform: translateY(100px);
    }

    .toast.show {
        transform: translateY(0);
    }

    .about-cert { padding: 20px; }

    .cert-item { gap: 12px; }
    .cert-icon { width: 40px; height: 40px; font-size: 10px; }
    .cert-info h4 { font-size: 13px; }
    .cert-info p { font-size: 11px; }

    .contact-icon-wrap { width: 40px; height: 40px; }

    .qr-code { width: 100px; height: 100px; }
    .qr-code-large { width: 130px; height: 130px; }

    /* Disable hover effects on touch devices */
    .product-card:hover,
    .feature-item:hover,
    .advantage-card:hover,
    .case-card:hover,
    .arch-card:hover {
        transform: none;
        box-shadow: var(--shadow-sm);
    }

    .btn-primary:hover,
    .btn-outline:hover,
    .nav-cta:hover,
    .float-trigger:hover {
        transform: none;
    }
}

/* ============ Small Mobile (≤480px) ============ */
@media (max-width: 480px) {
    :root { --nav-height: 52px; }

    .logo-main { font-size: 16px; }
    .logo-sub { font-size: 9px; }

    .hero {
        min-height: 80vh;
    }

    .hero-content { padding: 20px 16px; }

    .hero-badge {
        font-size: 11px;
        padding: 4px 14px;
        margin-bottom: 16px;
    }

    .hero-title {
        font-size: 22px;
        line-height: 1.4;
        margin-bottom: 14px;
    }

    .hero-desc {
        font-size: 14px;
        margin-bottom: 28px;
    }

    .hero-actions { gap: 10px; margin-bottom: 32px; }
    .hero-actions .btn { padding: 10px 24px; font-size: 14px; }

    .hero-stats {
        gap: 16px;
    }

    .stat-num { font-size: 22px; }
    .stat-label { font-size: 11px; }

    .section-title { font-size: 20px; }
    .section-desc { font-size: 13px; }
    .section-tag { font-size: 11px; }

    .risk-section, .products-section, .advantages-section,
    .cases-section, .about-section, .contact-section {
        padding: 44px 0;
    }

    .section-header { margin-bottom: 24px; }

    .container { padding: 0 14px; }

    .product-card { padding: 20px 16px; }
    .product-card h3 { font-size: 19px; }
    .product-icon { width: 48px; height: 48px; font-size: 20px; }

    .feature-item { padding: 20px 16px; }
    .feature-item h4 { font-size: 16px; }
    .feature-item p { font-size: 13px; }
    .feature-num { font-size: 24px; }

    .advantage-card { padding: 24px 16px; }
    .advantage-card h4 { font-size: 16px; }
    .advantage-card p { font-size: 13px; }
    .adv-number { font-size: 30px; }

    .case-image { height: 160px; }
    .case-body { padding: 16px; }
    .case-body h3 { font-size: 15px; }
    .case-body p { font-size: 13px; -webkit-line-clamp: 2; }
    .case-tags span { font-size: 11px; }

    .arch-grid { grid-template-columns: 1fr; }
    .arch-card { padding: 12px 8px; }
    .arch-icon { width: 36px; height: 36px; font-size: 16px; }
    .arch-card h4 { font-size: 14px; }
    .arch-card p { font-size: 11px; }

    .filter-btn { padding: 5px 14px; font-size: 12px; }

    .float-trigger {
        padding: 12px 8px;
        font-size: 12px;
    }

    .float-panel-body { padding: 16px; }

    .float-qr-box { padding: 8px; }
    .float-qr-tip { font-size: 13px; }
    .float-qr-desc { font-size: 11px; }

    .float-form-group input,
    .float-form-group select,
    .float-form-group textarea {
        padding: 9px 12px;
        font-size: 13px;
    }

    .contact-form-wrap { padding: 16px; }
    .contact-form h3 { font-size: 17px; }

    .form-group input,
    .form-group select,
    .form-group textarea {
        padding: 10px 14px;
        font-size: 13px;
    }

    .footer { padding: 32px 0 16px; }
    .footer-col h4 { font-size: 14px; }
    .footer-col ul li a { font-size: 13px; }
    .footer-brand p { font-size: 13px; }
    .footer-bottom p { font-size: 12px; }

    .back-to-top {
        bottom: 16px;
        right: 16px;
        width: 36px;
        height: 36px;
    }

    .nav-toggle { padding: 6px; }
    .nav-toggle span { width: 22px; }
}

/* ============ Landscape Mobile ============ */
@media (max-width: 900px) and (orientation: landscape) and (max-height: 500px) {
    .hero {
        min-height: 100vh;
        padding-top: var(--nav-height);
        align-items: flex-start;
        padding-top: calc(var(--nav-height) + 20px);
    }

    .hero-content { padding: 16px 20px; }
    .hero-title { font-size: 24px; margin-bottom: 12px; }
    .hero-desc { margin-bottom: 20px; font-size: 14px; }
    .hero-actions { margin-bottom: 20px; flex-direction: row; }
    .hero-stats { gap: 16px; }
    .stat-num { font-size: 22px; }

    .nav-menu {
        max-height: 70vh;
    }
}

/* ============ Safe Area (iPhone X+ notch) ============ */
@supports (padding: max(0px)) {
    .navbar {
        padding-left: max(0px, env(safe-area-inset-left));
        padding-right: max(0px, env(safe-area-inset-right));
    }

    .footer {
        padding-bottom: max(20px, env(safe-area-inset-bottom));
    }

    .float-panel {
        padding-bottom: env(safe-area-inset-bottom);
    }

    .back-to-top {
        bottom: max(20px, env(safe-area-inset-bottom));
        right: max(20px, env(safe-area-inset-right));
    }

    .toast {
        bottom: max(20px, env(safe-area-inset-bottom));
    }
}

/* ============ Touch Device Optimization ============ */
@media (hover: none) and (pointer: coarse) {
    .product-card:hover,
    .feature-item:hover,
    .advantage-card:hover,
    .case-card:hover,
    .arch-card:hover {
        transform: none;
        box-shadow: var(--shadow-sm);
    }

    .btn-primary:hover,
    .btn-outline:hover,
    .nav-cta:hover,
    .float-trigger:hover,
    .back-to-top:hover {
        transform: none;
    }

    .advantage-card::before { display: none; }

    .filter-btn { min-height: 40px; }

    .nav-toggle { padding: 12px; }

    .btn { min-height: 44px; }

    .float-trigger { min-height: 48px; }
}

/* ============ Reduce Motion (Accessibility) ============ */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    .fade-in {
        opacity: 1;
        transform: none;
    }

    .scroll-line::after { display: none; }
}

/* ============ Print ============ */
@media print {
    .navbar, .float-register, .back-to-top, .hero-scroll,
    .case-filters, .toast {
        display: none !important;
    }

    .hero {
        min-height: auto;
        color: #000;
        background: #fff !important;
    }

    .hero-bg, .hero-bg::before, .hero-bg::after {
        display: none;
    }

    .hero-content { color: #000; }
    .hero-title, .hero-desc, .stat-num, .stat-label { color: #000 !important; }

    body { background: #fff; }

    .risk-section, .products-section, .advantages-section,
    .cases-section, .about-section, .contact-section {
        padding: 20px 0;
        background: #fff !important;
    }

    .product-card, .feature-item, .advantage-card, .case-card {
        box-shadow: none;
        border: 1px solid #ddd;
        break-inside: avoid;
    }
}