/* Basic Reset & Fonts */
body, html {
    margin: 0;
    padding: 0;
    font-family: 'Noto Sans SC', sans-serif;
    background-color: #f8f9fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.main-header {
    background: #fff;
    padding: 15px 0;
    border-bottom: 1px solid #e9ecef;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: #007bff;
}

.main-header nav a {
    margin: 0 15px;
    text-decoration: none;
    color: #555;
    font-weight: 500;
}

/* Buttons */
.btn {
    text-decoration: none;
    padding: 10px 20px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: #007bff;
    color: #fff;
}

.btn-primary:hover {
    background-color: #0056b3;
}

.btn-secondary {
    background-color: #6c757d;
    color: #fff;
}

.btn-secondary:hover {
    background-color: #5a6268;
}

.btn-large {
    padding: 15px 30px;
    font-size: 18px;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 100px 0;
    background: #fff;
}

.hero h1 {
    font-size: 48px;
    margin-bottom: 10px;
}

.hero .subtitle {
    font-size: 22px;
    color: #6c757d;
    margin-bottom: 30px;
}

/* Story Section */
.story-section {
    padding: 80px 0;
    background: #fff;
    text-align: center;
}

.story-section h2 {
    font-size: 36px;
    margin-bottom: 50px;
}

.story-flow {
    max-width: 700px;
    margin: 0 auto;
}

.story-step {
    display: flex;
    align-items: flex-start;
    margin-bottom: 25px;
    text-align: left;
}

.story-step .avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    color: #fff;
    flex-shrink: 0;
}

.story-step.user-problem .avatar, .story-step.user-solution .avatar {
    background-color: #007bff;
}

.story-step.agent-response .avatar {
    background-color: #6c757d;
    font-size: 12px;
}

.story-step .bubble {
    background: #e9ecef;
    padding: 15px 20px;
    border-radius: 15px;
    position: relative;
}

.story-step.user-problem, .story-step.user-solution {
    justify-content: flex-end;
}

.story-step.user-problem .bubble, .story-step.user-solution .bubble {
    margin-right: 15px;
    order: -1;
    background-color: #dcf8c6;
}

.story-step.agent-response .bubble {
    margin-left: 15px;
}

/* Features Section */
.features-section {
    padding: 80px 0;
}

.features-section h2 {
    text-align: center;
    font-size: 36px;
    margin-bottom: 50px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-item {
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

.feature-item h3 {
    font-size: 22px;
    margin-bottom: 10px;
}

/* Contact Section */
.contact-section {
    background-color: #fff;
    padding: 80px 20px;
    text-align: center;
    border-top: 1px solid #e9ecef;
}

.contact-section h2 {
    font-size: 32px;
    margin-bottom: 20px;
}

.contact-section p {
    font-size: 18px;
    max-width: 600px;
    margin: 0 auto 30px auto;
    color: #6c757d;
    line-height: 1.7;
}

/* Footer */
.main-footer {
    background-color: #343a40;
    color: #f8f9fa;
    padding: 40px 20px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 20px;
    max-width: 1100px;
    margin-left: auto;
    margin-right: auto;
}

.footer-logo {
    font-size: 24px;
    font-weight: 700;
    color: #007bff;
}

.footer-nav a {
    color: #f8f9fa;
    text-decoration: none;
    margin-left: 20px;
    transition: color 0.3s;
}

.footer-nav a:hover {
    color: #007bff;
}

.footer-social a {
    color: #f8f9fa;
    font-size: 22px;
    margin-left: 15px;
    transition: color 0.3s;
}

.footer-social a:hover {
    color: #007bff;
}

.footer-copy {
    text-align: center;
    border-top: 1px solid #495057;
    padding-top: 20px;
    font-size: 14px;
    color: #6c757d;
}