* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4285f4;
    --primary-dark: #3367d6;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #fbbc04;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow-sm: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    --shadow-md: 0 1px 3px 0 rgba(60, 64, 67, 0.3), 0 4px 8px 3px rgba(60, 64, 67, 0.15);
    --shadow-lg: 0 2px 6px 2px rgba(60, 64, 67, 0.15), 0 8px 24px 4px rgba(60, 64, 67, 0.15);
}

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
}

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

.logo h1 {
    font-size: 28px;
    font-weight: 700;
    color: var(--primary-color);
}

.badge {
    background: var(--secondary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
}

.nav {
    display: flex;
    gap: 32px;
}

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

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

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

.hero-title {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.95;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-features {
    display: flex;
    justify-content: center;
    gap: 40px;
    flex-wrap: wrap;
}

.feature-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 500;
}

.feature-item .icon {
    width: 24px;
    height: 24px;
}

/* Chat Section */
.chat-section {
    padding: 60px 0;
}

.chat-wrapper {
    background: var(--bg-white);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    max-width: 900px;
    margin: 0 auto;
}

.chat-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-header h3 {
    font-size: 24px;
    margin-bottom: 4px;
}

.chat-header p {
    opacity: 0.9;
    font-size: 14px;
}

.btn-clear {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: white;
    padding: 8px 16px;
    border-radius: 8px;
    cursor: pointer;
    font-weight: 500;
    transition: all 0.2s;
}

.btn-clear:hover {
    background: rgba(255, 255, 255, 0.3);
}

.chat-messages {
    height: 500px;
    overflow-y: auto;
    padding: 24px;
    background: var(--bg-light);
}

.message {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    animation: fadeIn 0.3s ease-in;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.message-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    flex-shrink: 0;
}

.bot-message .message-avatar {
    background: var(--primary-color);
}

.user-message {
    flex-direction: row-reverse;
}

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

.message-content {
    background: var(--bg-white);
    padding: 16px;
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    max-width: 70%;
}

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

.message-content p {
    margin-bottom: 8px;
}

.message-content p:last-child {
    margin-bottom: 0;
}

.message-content ul {
    margin-left: 20px;
}

.message-content code {
    background: var(--bg-light);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
}

.user-message .message-content code {
    background: rgba(255, 255, 255, 0.2);
}

.tracking-link {
    background: var(--bg-light);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 12px;
    margin-top: 12px;
    word-break: break-all;
}

.tracking-link-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.tracking-link-header strong {
    color: var(--secondary-color);
}

.btn-copy {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 6px 12px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 12px;
    font-weight: 600;
    transition: background 0.2s;
}

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

.btn-copy.copied {
    background: var(--secondary-color);
}

.tracking-url {
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: var(--text-primary);
    line-height: 1.5;
}

/* Chat Input */
.chat-input-form {
    display: flex;
    gap: 12px;
    padding: 20px 24px;
    background: var(--bg-white);
    border-top: 1px solid var(--border-color);
}

.chat-input {
    flex: 1;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.chat-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.btn-send {
    background: var(--primary-color);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.btn-send:hover {
    background: var(--primary-dark);
    transform: scale(1.05);
}

.btn-send:disabled {
    background: var(--border-color);
    cursor: not-allowed;
    transform: none;
}

.btn-send svg {
    width: 20px;
    height: 20px;
    stroke: white;
    stroke-width: 2;
}

/* Features Section */
.features-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.section-title {
    text-align: center;
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 60px;
    color: var(--text-primary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.feature-card {
    padding: 32px;
    border-radius: 12px;
    background: var(--bg-light);
    transition: all 0.3s;
}

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

.feature-icon {
    font-size: 48px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* How It Works */
.how-it-works {
    padding: 80px 0;
    background: var(--bg-light);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-top: 60px;
}

.step {
    text-align: center;
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin: 0 auto 20px;
}

.step h3 {
    font-size: 20px;
    margin-bottom: 12px;
}

.step p {
    color: var(--text-secondary);
}

/* Compliance Section */
.compliance-section {
    padding: 80px 0;
    background: var(--bg-white);
}

.compliance-intro {
    text-align: center;
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 800px;
    margin: 0 auto 40px;
}

.compliance-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.compliance-item {
    display: flex;
    gap: 16px;
    padding: 24px;
    background: var(--bg-light);
    border-radius: 12px;
}

.check-icon {
    width: 28px;
    height: 28px;
    color: var(--secondary-color);
    flex-shrink: 0;
}

.compliance-item h4 {
    font-size: 18px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

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

.compliance-item code {
    background: var(--bg-white);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
}

.compliance-example {
    background: var(--bg-light);
    padding: 24px;
    border-radius: 12px;
    border-left: 4px solid var(--secondary-color);
}

.compliance-example h4 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.example-url {
    display: block;
    background: var(--bg-white);
    padding: 16px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 13px;
    color: var(--primary-color);
    word-break: break-all;
    margin-bottom: 12px;
}

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

.example-note code {
    background: var(--bg-white);
    padding: 2px 6px;
    border-radius: 4px;
}

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

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

.cta-content p {
    font-size: 18px;
    opacity: 0.95;
    margin-bottom: 32px;
}

.btn-primary {
    background: white;
    color: var(--primary-color);
    padding: 16px 40px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 16px;
    display: inline-block;
    transition: all 0.2s;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 60px 0 20px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h3 {
    font-size: 20px;
    margin-bottom: 16px;
}

.footer-section h4 {
    font-size: 16px;
    margin-bottom: 16px;
}

.footer-section p {
    opacity: 0.8;
    line-height: 1.6;
}

.footer-note {
    font-size: 14px;
    margin-top: 8px;
}

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

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: white;
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.2s;
}

.footer-section ul li a:hover {
    opacity: 1;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 20px;
    text-align: center;
}

.footer-bottom p {
    opacity: 0.6;
    font-size: 14px;
    margin-bottom: 8px;
}

/* Loading Spinner */
.loading-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 36px;
    }

    .hero-subtitle {
        font-size: 18px;
    }

    .nav {
        display: none;
    }

    .section-title {
        font-size: 28px;
    }

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

    .steps {
        grid-template-columns: 1fr;
    }

    .compliance-grid {
        grid-template-columns: 1fr;
    }

    .message-content {
        max-width: 85%;
    }

    .chat-messages {
        height: 400px;
    }
}