/* Fellowtrip Morandi Theme */
:root {
    --bg-color: #FDFDFB;
    --text-primary: #121212;
    --text-secondary: #A0A090;
    --border-color: #EAE9E4;
    --accent-color: #D1D1C1;
    --surface-color: #F5F5F2;
    --primary-btn: #121212;
    --primary-btn-text: #FFFFFF;
}

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

body {
    font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

a {
    color: var(--text-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--text-secondary);
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Navbar */
.navbar {
    border-bottom: 1px solid var(--border-color);
    background-color: var(--bg-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    font-size: 24px;
    font-weight: 900;
    letter-spacing: -1px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-img {
    width: 28px;
    height: 28px;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-secondary);
}

.nav-links a.active, .nav-links a:hover {
    color: var(--text-primary);
    font-weight: 800;
}

/* Hero Section */
.hero {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 24px;
}

.hero-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
    letter-spacing: -1.5px;
}

.hero-subtitle {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.btn {
    display: inline-block;
    padding: 16px 32px;
    border-radius: 30px;
    font-size: 15px;
    font-weight: 800;
    letter-spacing: 1px;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
}

.btn.disabled {
    background-color: var(--surface-color);
    color: var(--text-secondary);
    cursor: not-allowed;
    box-shadow: none;
}

.btn.disabled:hover {
    transform: none;
}

/* Document Section (Privacy & Terms) */
.document {
    flex: 1;
    padding: 60px 24px 100px;
}

.doc-title {
    font-size: 32px;
    font-weight: 900;
    margin-bottom: 8px;
    letter-spacing: -1px;
}

.doc-date {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 600;
    margin-bottom: 40px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 20px;
}

.doc-content h3 {
    font-size: 18px;
    font-weight: 800;
    margin-top: 32px;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.doc-content p {
    font-size: 15px;
    color: #444;
    margin-bottom: 16px;
    line-height: 1.8;
}

.doc-content ul {
    margin-left: 20px;
    margin-bottom: 24px;
}

.doc-content li {
    font-size: 15px;
    color: #444;
    margin-bottom: 8px;
    line-height: 1.6;
}

.doc-content strong {
    color: var(--text-primary);
    font-weight: 800;
}

/* Footer */
.footer {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.copyright {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    font-size: 13px;
    color: var(--text-secondary);
    font-weight: 600;
}

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

/* Mobile Responsive */
@media (max-width: 600px) {
    .hero-title {
        font-size: 36px;
    }
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
}