/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --primary-lighter: #60a5fa;
    --primary-bg: #eff6ff;
    --secondary-color: #0ea5e9;
    --text-color: #1e293b;
    --text-light: #64748b;
    --text-lighter: #94a3b8;
    --bg-color: #ffffff;
    --bg-light: #f8fafc;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
}

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

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1.5px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-bg);
}

.btn-white {
    background: white;
    color: var(--primary-color);
}

.btn-white:hover {
    background: var(--primary-bg);
    transform: translateY(-1px);
}

.btn-outline-white {
    background: transparent;
    color: white;
    border: 1.5px solid white;
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-lg {
    padding: 14px 28px;
    font-size: 16px;
}

.btn-block {
    width: 100%;
}

.download-btn {
    gap: 8px;
    min-width: 180px;
    justify-content: center;
}

.btn-icon {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    object-fit: cover;
}

.logo-text {
    font-size: 22px;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-links a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color 0.2s;
}

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

.nav-buttons {
    display: flex;
    gap: 12px;
}

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

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-color);
    transition: all 0.3s;
}

/* Hero Section */
.hero {
    position: relative;
    padding: 140px 0 80px;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-content .highlight {
    color: var(--primary-color);
}

.hero-desc {
    font-size: 18px;
    color: var(--text-light);
    margin-bottom: 32px;
    max-width: 500px;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.stat-label {
    font-size: 14px;
    color: var(--text-light);
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
}

.chat-window {
    width: 380px;
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    background: var(--primary-color);
    color: white;
}

.chat-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
}

.chat-info {
    display: flex;
    flex-direction: column;
}

.chat-name {
    font-weight: 600;
    font-size: 15px;
}

.chat-status {
    font-size: 12px;
    opacity: 0.8;
}

.chat-messages {
    padding: 20px;
    min-height: 240px;
    background: var(--bg-light);
}

.message {
    display: flex;
    gap: 10px;
    margin-bottom: 16px;
}

.message-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--primary-lighter);
    flex-shrink: 0;
}

.message-avatar.alt {
    background: var(--secondary-color);
}

.message-content {
    background: white;
    padding: 10px 14px;
    border-radius: var(--radius-lg);
    max-width: 80%;
    box-shadow: var(--shadow-sm);
}

.message-sender {
    font-size: 12px;
    color: var(--text-light);
    display: block;
    margin-bottom: 4px;
}

.message-content p {
    font-size: 14px;
    margin: 0;
}

.message-sent {
    justify-content: flex-end;
}

.message-sent .message-content {
    background: var(--primary-color);
    color: white;
}

.chat-input {
    display: flex;
    gap: 10px;
    padding: 16px 20px;
    background: white;
    border-top: 1px solid var(--border-color);
}

.chat-input input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 14px;
    outline: none;
    transition: border-color 0.2s;
}

.chat-input input:focus {
    border-color: var(--primary-color);
}

.send-btn {
    padding: 10px 20px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
}

.send-btn:hover {
    background: var(--primary-dark);
}

.hero-bg {
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-bg) 0%, rgba(37, 99, 235, 0.1) 100%);
    z-index: -1;
    border-radius: 0 0 0 100px;
}

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

.section-header h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-header p {
    font-size: 18px;
    color: var(--text-light);
}

/* Features Section */
.features {
    padding: 100px 0;
    background: var(--bg-light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: var(--primary-bg);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary-color);
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.feature-card p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.6;
}

/* Advantages Section */
.advantages {
    padding: 100px 0;
}

.advantages-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.advantage-item {
    display: flex;
    gap: 24px;
    padding: 30px;
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.advantage-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.advantage-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary-bg);
    line-height: 1;
}

.advantage-info h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 10px;
}

.advantage-info p {
    font-size: 15px;
    color: var(--text-light);
    line-height: 1.6;
}

/* Cases Section */
.cases {
    padding: 100px 0;
    background: var(--bg-light);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.case-card {
    background: white;
    padding: 32px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
    transition: transform 0.3s;
}

.case-card:hover {
    transform: translateY(-5px);
}

.case-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.case-card h3 {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.case-card p {
    font-size: 15px;
    color: var(--text-light);
}

/* CTA Section */
.cta {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    text-align: center;
    color: white;
}

.cta h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.cta p {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* Contact Section */
.contact {
    padding: 100px 0;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
}

.contact-info h2 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-info > p {
    font-size: 16px;
    color: var(--text-light);
    margin-bottom: 32px;
}

.contact-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 16px;
}

.contact-icon {
    font-size: 24px;
}

.contact-form {
    background: var(--bg-light);
    padding: 40px;
    border-radius: var(--radius-lg);
}

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 15px;
    font-family: inherit;
    outline: none;
    transition: border-color 0.2s;
    background: white;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* Footer */
.footer {
    background: var(--text-color);
    color: white;
    padding: 60px 0 0;
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-brand .logo-text {
    color: white;
}

.footer-brand p {
    color: var(--text-lighter);
    font-size: 15px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-column ul {
    list-style: none;
}

.footer-column li {
    margin-bottom: 12px;
}

.footer-column a {
    color: var(--text-lighter);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
}

.footer-bottom p {
    color: var(--text-lighter);
    font-size: 14px;
}

.footer-legal {
    display: flex;
    gap: 24px;
}

.footer-legal a {
    color: var(--text-lighter);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.footer-legal a:hover {
    color: white;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content h1 {
        font-size: 40px;
    }

    .hero-desc {
        margin: 0 auto 32px;
    }

    .hero-buttons {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-image {
        display: none;
    }

    .hero-bg {
        width: 100%;
        border-radius: 0;
    }

    .features-grid,
    .cases-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-content {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .hero {
        padding: 120px 0 60px;
    }

    .hero-content h1 {
        font-size: 32px;
    }

    .hero-desc {
        font-size: 16px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .section-header h2 {
        font-size: 28px;
    }

    .features-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

    .cta h2 {
        font-size: 28px;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-bottom {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .feature-card,
    .case-card {
        padding: 24px;
    }

    .contact-form {
        padding: 24px;
    }

    .advantage-item {
        flex-direction: column;
        gap: 16px;
    }

    .footer-links {
        grid-template-columns: 1fr;
    }
}