:root {
    --primary-color: #4A90E2;
    --secondary-color: #2C3E50;
    --background-color: #F5F6FA;
    --text-color: #2C3E50;
    --container-width: 1200px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

@media (max-width: 768px) {
    .container {
        padding: 0 24px;
    }
}

/* Header Styles */
header {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

nav {
    padding: 1rem 0;
}

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

nav h1 {
    font-size: 1.5rem;
    color: var(--primary-color);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

/* Hero Section */
#hero {
    padding: 8rem 0 4rem;
    text-align: center;
}

.hero-content h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    color: #666;
    margin-bottom: 2rem;
}

.button {
    display: inline-block;
    padding: 1rem 2rem;
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.button:hover {
    background-color: #357ABD;
}

/* Features Section */
#features {
    padding: 4rem 0;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.feature-card img {
    width: 100px;
    height: 100px;
    object-fit: contain;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
}

/* Usage Section */
#usage {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.usage-steps {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin-top: 2rem;
    flex-wrap: wrap;
}

.step {
    text-align: center;
    padding: 2rem;
    flex: 0 1 300px;
    display: flex;
    flex-direction: column;
    align-items: center;
    background-color: white;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
}

.step p {
    font-size: 1.1rem;
    line-height: 1.5;
    max-width: 250px;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .usage-steps {
        gap: 2rem;
    }
    
    .step {
        padding: 1.5rem;
    }
}

/* Demo Section */
#demo {
    padding: 4rem 0;
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.demo-item {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-align: center;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.demo-item img {
    max-width: 100%;
    height: auto;
    margin-top: 1rem;
}

/* Footer */
footer {
    background-color: var(--secondary-color);
    color: white;
    padding: 2rem 0;
    text-align: center;
}

/* Section Titles */
section h2 {
    margin-bottom: 2rem;
    padding: 0 1rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    nav .container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        gap: 1rem;
    }

    .hero-content h2 {
        font-size: 2rem;
    }
}

html {
    scroll-behavior: smooth;
}

/* 為了補償固定導航欄的高度，讓錨點位置更準確 */
#features, #usage, #demo, #contact {
    scroll-margin-top: 80px;
}

/* Contact Section */
#contact {
    padding: 4rem 0;
    background-color: var(--background-color);
}

.contact-text {
    background-color: white;
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-top: 2rem;
}

.contact-text p {
    margin-bottom: 1.5rem;
    color: var(--text-color);
    font-size: 1.1rem;
}

.contact-text p:last-child {
    margin-bottom: 0;
}

#contact .cta-button {
    margin-top: 2.5rem;
    text-align: center;
}

#contact .button {
    font-size: 1.1rem;
    padding: 1.2rem 3rem;
}