/* ===== CSS Variables ===== */
:root {
    --primary: #0a2e5c;
    --primary-light: #1a4a8a;
    --primary-dark: #061d3a;
    --accent: #00b4d8;
    --accent-light: #48cae4;
    --accent-dark: #0096c7;
    --water: #0077b6;
    --water-light: #90e0ef;
    --bg-dark: #041428;
    --bg-section: #f0f7ff;
    --bg-card: #ffffff;
    --text-primary: #1a1a2e;
    --text-secondary: #555;
    --text-light: #888;
    --text-white: #ffffff;
    --gradient-hero: linear-gradient(135deg, #0a2e5c 0%, #0077b6 50%, #00b4d8 100%);
    --gradient-accent: linear-gradient(135deg, #00b4d8, #0077b6);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.9), rgba(255,255,255,0.6));
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.15);
    --shadow-glow: 0 0 30px rgba(0,180,216,0.3);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: #fff;
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
ul { list-style: none; }

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Typography ===== */
h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800; line-height: 1.2; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); font-weight: 700; line-height: 1.3; }
h3 { font-size: 1.25rem; font-weight: 600; line-height: 1.4; }
h4 { font-size: 1.1rem; font-weight: 600; }

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.btn-primary {
    background: var(--gradient-accent);
    color: var(--text-white);
    box-shadow: 0 4px 15px rgba(0,180,216,0.4);
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0,180,216,0.5);
}
.btn-outline {
    background: transparent;
    color: var(--text-white);
    border: 2px solid rgba(255,255,255,0.5);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.15);
    border-color: #fff;
}
.btn-sm {
    padding: 10px 24px;
    font-size: 0.9rem;
    background: var(--gradient-accent);
    color: var(--text-white);
    border-radius: 50px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    box-shadow: 0 2px 10px rgba(0,180,216,0.3);
}
.btn-sm:hover { transform: translateY(-1px); box-shadow: 0 4px 15px rgba(0,180,216,0.4); }
.btn-full { width: 100%; justify-content: center; }

/* ===== Navbar ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}
.navbar.scrolled {
    background: rgba(10,46,92,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 10px 0;
    box-shadow: 0 2px 20px rgba(0,0,0,0.2);
}
.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-white);
    z-index: 1001;
}
.logo-icon { font-size: 1.6rem; }
.logo-img { height: 32px; width: auto; }
.footer-logo .logo-img { height: 36px; }
.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}
.nav-menu a {
    padding: 8px 16px;
    color: rgba(255,255,255,0.85);
    font-size: 0.95rem;
    font-weight: 500;
    border-radius: 8px;
    transition: var(--transition);
}
.nav-menu a:hover { color: #fff; background: rgba(255,255,255,0.1); }
.nav-cta {
    background: var(--accent) !important;
    color: #fff !important;
    border-radius: 50px !important;
    padding: 8px 20px !important;
}
.nav-cta:hover { background: var(--accent-light) !important; }
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    z-index: 1001;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    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;
    background: var(--gradient-hero);
    overflow: hidden;
    padding-top: 80px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}
/* Water ripple animation */
.water-ripple {
    position: absolute;
    border-radius: 50%;
    border: 2px solid rgba(0,180,216,0.2);
    animation: ripple 6s ease-out infinite;
}
.r1 { width: 400px; height: 400px; bottom: -100px; left: -100px; animation-delay: 0s; }
.r2 { width: 600px; height: 600px; bottom: -200px; right: -200px; animation-delay: 2s; }
.r3 { width: 300px; height: 300px; top: 20%; right: 10%; animation-delay: 4s; }
@keyframes ripple {
    0% { transform: scale(0.5); opacity: 1; }
    100% { transform: scale(2.5); opacity: 0; }
}
/* Floating bubbles */
.hero-bg::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle 4px at 10% 80%, rgba(0,180,216,0.15) 0%, transparent 100%),
        radial-gradient(circle 6px at 30% 60%, rgba(0,180,216,0.1) 0%, transparent 100%),
        radial-gradient(circle 3px at 50% 90%, rgba(72,202,228,0.12) 0%, transparent 100%),
        radial-gradient(circle 5px at 70% 70%, rgba(0,180,216,0.08) 0%, transparent 100%),
        radial-gradient(circle 4px at 90% 50%, rgba(72,202,228,0.1) 0%, transparent 100%);
    animation: floatBubbles 15s ease-in-out infinite;
}
@keyframes floatBubbles {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-30px); }
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}
.hero-badge {
    display: inline-block;
    padding: 6px 20px;
    background: rgba(0,180,216,0.2);
    border: 1px solid rgba(0,180,216,0.3);
    border-radius: 50px;
    color: var(--accent-light);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 20px;
    backdrop-filter: blur(10px);
}
.hero-title {
    color: var(--text-white);
    margin-bottom: 20px;
}
.text-gradient {
    background: linear-gradient(135deg, var(--accent-light), var(--water-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-subtitle {
    color: rgba(255,255,255,0.8);
    font-size: 1.1rem;
    margin-bottom: 32px;
    max-width: 540px;
}
.hero-actions { display: flex; gap: 16px; margin-bottom: 48px; flex-wrap: wrap; }
.hero-stats {
    display: flex;
    gap: 40px;
}
.stat-item { text-align: center; }
.stat-number {
    font-size: 2.2rem;
    font-weight: 800;
    color: var(--accent-light);
    display: inline;
}
.stat-suffix {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--accent-light);
}
.stat-label {
    display: block;
    color: rgba(255,255,255,0.7);
    font-size: 0.85rem;
    margin-top: 4px;
}
.hero-visual { position: relative; display: flex; justify-content: center; }
.hero-image-wrapper {
    position: relative;
    width: 100%;
    max-width: 500px;
}
.hero-product-img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    position: relative;
    z-index: 2;
}
.hero-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80%;
    height: 80%;
    background: radial-gradient(circle, rgba(0,180,216,0.3) 0%, transparent 70%);
    filter: blur(40px);
    z-index: 1;
    animation: pulse 4s ease-in-out infinite;
}
@keyframes pulse {
    0%, 100% { opacity: 0.6; transform: translate(-50%, -50%) scale(1); }
    50% { opacity: 1; transform: translate(-50%, -50%) scale(1.1); }
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    color: rgba(255,255,255,0.6);
    font-size: 0.8rem;
    z-index: 2;
    animation: scrollBounce 2s ease-in-out infinite;
}
.mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(255,255,255,0.5);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 6px;
}
.wheel {
    width: 3px;
    height: 8px;
    background: rgba(255,255,255,0.7);
    border-radius: 2px;
    animation: scrollWheel 2s ease-in-out infinite;
}
@keyframes scrollWheel {
    0% { transform: translateY(0); opacity: 1; }
    50% { transform: translateY(8px); opacity: 0; }
    100% { transform: translateY(0); opacity: 1; }
}
@keyframes scrollBounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(8px); }
}

/* ===== Section Common ===== */
.section {
    padding: 100px 0;
}
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    padding: 4px 16px;
    background: linear-gradient(135deg, rgba(0,180,216,0.1), rgba(0,119,182,0.1));
    color: var(--accent-dark);
    border-radius: 50px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
    letter-spacing: 1px;
}
.section-title {
    color: var(--text-primary);
    margin-bottom: 16px;
}
.section-title.left-aligned { text-align: left; }
.section-desc {
    color: var(--text-secondary);
    font-size: 1.05rem;
    max-width: 600px;
    margin: 0 auto;
}

/* ===== Problems ===== */
.problems { background: var(--bg-section); }
.problems-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.problem-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
    position: relative;
    overflow: hidden;
}
.problem-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-accent);
    transform: scaleX(0);
    transition: var(--transition);
}
.problem-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.problem-card:hover::before { transform: scaleX(1); }
.problem-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    color: var(--accent);
}
.problem-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}
.problem-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}
.problem-highlight {
    display: inline-block;
    padding: 4px 12px;
    background: rgba(0,180,216,0.08);
    color: var(--accent-dark);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

/* ===== Solutions ===== */
.solutions { background: #fff; }
.solutions-flow {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    justify-content: center;
}
.solution-step {
    flex: 1;
    max-width: 320px;
    text-align: center;
    padding: 32px 24px;
    background: var(--bg-section);
    border-radius: var(--radius-md);
    transition: var(--transition);
    position: relative;
}
.solution-step:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.step-number {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 36px;
    height: 36px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 700;
    box-shadow: 0 2px 10px rgba(0,180,216,0.4);
}
.step-icon {
    width: 56px;
    height: 56px;
    margin: 16px auto 16px;
    color: var(--accent);
}
.solution-step h3 { margin-bottom: 12px; }
.solution-step p { color: var(--text-secondary); font-size: 0.9rem; }
.solution-connector {
    flex-shrink: 0;
    width: 60px;
    color: var(--accent);
    margin-top: 60px;
    opacity: 0.5;
}

/* ===== Products ===== */
.products { background: var(--bg-section); }
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}
.product-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
}
.product-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}
.product-image {
    position: relative;
    height: 240px;
    overflow: hidden;
}
.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}
.product-card:hover .product-image img {
    transform: scale(1.05);
}
.product-badge {
    position: absolute;
    top: 16px;
    left: 16px;
    padding: 4px 14px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}
.product-badge.new { background: linear-gradient(135deg, #00b894, #00cec9); }
.product-badge.hot { background: linear-gradient(135deg, #e17055, #d63031); }
.product-info { padding: 24px; }
.product-tag {
    display: inline-block;
    padding: 2px 10px;
    background: rgba(0,180,216,0.1);
    color: var(--accent-dark);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 10px;
}
.product-info h3 { margin-bottom: 10px; }
.product-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
    line-height: 1.6;
}
.product-features {
    margin-bottom: 20px;
}
.product-features li {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 0;
    font-size: 0.9rem;
    color: var(--text-primary);
}
.product-features svg {
    flex-shrink: 0;
    color: var(--accent);
}

/* ===== Cases ===== */
.cases { background: #fff; }
.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.case-card {
    border-radius: var(--radius-md);
    overflow: hidden;
    background: var(--bg-card);
    border: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
}
.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.case-image {
    position: relative;
    height: 200px;
    overflow: hidden;
}
.case-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}
.case-card:hover .case-image img { transform: scale(1.05); }
.case-overlay {
    position: absolute;
    top: 12px;
    right: 12px;
}
.case-tag {
    padding: 4px 12px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(8px);
    color: #fff;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 500;
}
.case-info { padding: 20px; }
.case-info h4 { margin-bottom: 8px; }
.case-info p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    margin-bottom: 12px;
    line-height: 1.6;
}
.case-meta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}
.case-meta span {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ===== Advantages ===== */
.advantages { background: var(--bg-section); }
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.advantage-card {
    background: var(--bg-card);
    border-radius: var(--radius-md);
    padding: 36px 28px;
    text-align: center;
    transition: var(--transition);
    border: 1px solid rgba(0,0,0,0.05);
    position: relative;
}
.advantage-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.advantage-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 20px;
    color: var(--accent);
}
.advantage-card h3 { margin-bottom: 12px; }
.advantage-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ===== FAQ + Contact ===== */
.faq-contact {
    background: #fff;
}
.faq-contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: flex-start;
}
.faq-list { margin-top: 24px; }
.faq-item {
    border-bottom: 1px solid rgba(0,0,0,0.08);
}
.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 18px 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    text-align: left;
    transition: var(--transition);
}
.faq-question:hover { color: var(--accent); }
.faq-arrow {
    transition: var(--transition);
    flex-shrink: 0;
    color: var(--text-light);
}
.faq-item.active .faq-arrow { transform: rotate(180deg); color: var(--accent); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.3s ease;
}
.faq-item.active .faq-answer {
    max-height: 300px;
    padding-bottom: 18px;
}
.faq-answer p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.contact-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 24px;
}
.contact-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1.5px solid #e0e0e0;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: inherit;
    transition: var(--transition);
    background: #fafbfc;
    color: var(--text-primary);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0,180,216,0.1);
    background: #fff;
}
.form-group.full-width { grid-column: 1 / -1; }
.form-group textarea { resize: vertical; }
.contact-form .btn-full { grid-column: 1 / -1; margin-top: 8px; }

.contact-info-cards {
    display: flex;
    gap: 16px;
    margin-top: 24px;
}
.info-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-section);
    border-radius: var(--radius-sm);
    flex: 1;
}
.info-card svg { color: var(--accent); flex-shrink: 0; }
.info-label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-light);
}
.info-value {
    display: block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* ===== Footer ===== */
.footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.8);
    padding: 60px 0 0;
}
.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}
.footer-tagline {
    color: rgba(255,255,255,0.5);
    font-size: 0.9rem;
}
.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.footer-col h4 {
    color: #fff;
    font-size: 1rem;
    margin-bottom: 16px;
}
.footer-col a {
    display: block;
    padding: 4px 0;
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    transition: var(--transition);
}
.footer-col a:hover { color: var(--accent-light); }
.footer-bottom {
    text-align: center;
    padding: 20px 0;
    color: rgba(255,255,255,0.4);
    font-size: 0.8rem;
}

/* ===== Back to Top ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: var(--gradient-accent);
    color: #fff;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0,180,216,0.4);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(0,180,216,0.5);
}

/* ===== Scroll Reveal ===== */
.reveal-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    transition-delay: var(--delay, 0s);
}
.reveal-up.revealed {
    opacity: 1;
    transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 992px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 40px;
    }
    .hero-subtitle { max-width: 100%; }
    .hero-actions { justify-content: center; }
    .hero-stats { justify-content: center; }
    .hero-visual { order: -1; }
    .hero-image-wrapper { max-width: 360px; }
    .problems-grid { grid-template-columns: repeat(2, 1fr); }
    .products-grid { grid-template-columns: repeat(2, 1fr); }
    .cases-grid { grid-template-columns: repeat(2, 1fr); }
    .advantages-grid { grid-template-columns: repeat(2, 1fr); }
    .faq-contact-grid { grid-template-columns: 1fr; gap: 48px; }
    .solutions-flow { flex-direction: column; align-items: center; }
    .solution-connector { transform: rotate(90deg); margin: 0; width: 40px; }
}

@media (max-width: 768px) {
    .nav-toggle { display: flex; }
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--primary-dark);
        flex-direction: column;
        padding: 80px 24px 32px;
        gap: 4px;
        transition: var(--transition);
        box-shadow: -4px 0 20px rgba(0,0,0,0.3);
    }
    .nav-menu.active { right: 0; }
    .nav-menu a { padding: 12px 16px; font-size: 1rem; }
    .hero { padding-top: 100px; min-height: auto; padding-bottom: 60px; }
    .hero-stats { gap: 24px; }
    .stat-number { font-size: 1.8rem; }
    .problems-grid { grid-template-columns: 1fr; }
    .products-grid { grid-template-columns: 1fr; }
    .cases-grid { grid-template-columns: 1fr; }
    .advantages-grid { grid-template-columns: 1fr; }
    .contact-form { grid-template-columns: 1fr; }
    .contact-info-cards { flex-direction: column; }
    .footer-content { grid-template-columns: 1fr; gap: 32px; }
    .footer-links { grid-template-columns: repeat(2, 1fr); }
    .section { padding: 60px 0; }
}

@media (max-width: 480px) {
    .container { padding: 0 16px; }
    .btn { padding: 12px 24px; font-size: 0.9rem; }
    .hero-actions { flex-direction: column; align-items: center; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .footer-links { grid-template-columns: 1fr; }
}