/* style.css */
:root {
    --primary: #6750A4;
    --primary-container: #EADDFF;
    --on-primary-container: #21005D;
    --surface: #FFFBFE;
    --surface-variant: #E7E0EC;
    --background: #F3EDF7;
    --on-surface: #1C1B1F;
    --on-surface-variant: #49454F;
    --outline: #79747E;
    --outline-variant: #CAC4D0;
    --border: #E0E0E0;
    --card-radius: 16px;
    --button-radius: 24px;
    --elevation-1: 0 1px 1px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.05);
    --elevation-2: 0 2px 3px rgba(0,0,0,0.1), 0 2px 4px rgba(0,0,0,0.08);
    --elevation-button: 0 2px 4px rgba(0,0,0,0.1);
    --transition: cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Noto Sans SC', sans-serif;
}

body {
    background-color: var(--background);
    color: var(--on-surface);
    line-height: 1.6;
    padding: 20px;
    max-width: 1200px;
    margin: 0 auto;
    transition: background-color 0.3s var(--transition);
}

header {
    text-align: center;
    padding: 40px 0 30px;
}

.branding {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.logo {
    background: linear-gradient(145deg, var(--primary), #8A79CB);
    height: 80px;
    width: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--elevation-1);
    transition: all 0.3s var(--transition);
    border-radius: 26px;
    position: relative;
    overflow: visible;
}

.logo i {
    font-size: 48px;
    color: white;
    text-shadow: 0 2px 4px rgba(0,0,0,0.25);
    position: relative;
    z-index: 1;
}

.dark-theme .logo {
    background: linear-gradient(145deg, #D0BCFF, #9A82F5);
}

.dark-theme .logo::after {
    background: rgba(255,255,255,0.1);
}

h1 {
    font-weight: 700;
    font-size: 2.5rem;
    margin-bottom: 10px;
    color: var(--primary);
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.2rem;
    color: var(--on-surface-variant);
    max-width: 600px;
    margin: 0 auto 30px;
}

.features-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin: 20px auto 0;
    max-width: 800px;
}

.feature-item {
    display: inline-flex;
    align-items: center;
    background: rgba(103, 80, 164, 0.08);
    color: var(--primary);
    padding: 10px 18px;
    border-radius: var(--button-radius);
    font-size: 0.95rem;
    transition: all 0.3s var(--transition);
    border: 1px solid var(--outline-variant);
}

.feature-item:hover {
    background: rgba(103, 80, 164, 0.15);
    transform: translateY(-2px);
    box-shadow: var(--elevation-1);
}

.feature-item i {
    margin-right: 8px;
    font-size: 18px;
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.card {
    background: var(--surface);
    border-radius: var(--card-radius);
    box-shadow: var(--elevation-1);
    padding: 24px;
    transition: all 0.3s var(--transition);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--outline-variant);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
}

.card:hover {
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

.card h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    color: var(--primary);
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 500;
}

.card h2 i {
    background: var(--primary-container);
    color: var(--on-primary-container);
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.feature-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.feature-list li {
    padding: 14px 0;
    border-bottom: 1px solid var(--outline-variant);
    display: flex;
    align-items: center;
    font-weight: 400;
    color: var(--on-surface);
}

.feature-list li:last-child {
    border-bottom: none;
}

.feature-list li::before {
    content: "鉁?;
    color: var(--primary);
    font-weight: bold;
    margin-right: 16px;
    font-size: 18px;
}

footer {
    text-align: center;
    padding: 30px 0;
    color: var(--on-surface-variant);
    border-top: 1px solid var(--outline-variant);
    margin-top: 40px;
    font-size: 0.9rem;
}

.icp {
    margin-top: 20px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
}

.icp a {
    color: var(--on-surface-variant);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    padding: 10px 20px;
    background: var(--surface);
    border-radius: 15px;
    border: 1px solid var(--outline-variant);
    transition: all 0.3s var(--transition);
    font-size: 0.9rem;
    box-shadow: var(--elevation-1);
    min-height: 40px;
}

.icp a:hover {
    background: var(--primary-container);
    color: var(--on-primary-container);
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--elevation-2);
}

.icp-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    margin-right: 10px;
    vertical-align: middle;
    background: rgba(103, 80, 164, 0.1);
    border-radius: 50%;
    width: 24px;
    height: 24px;
}

.icp-icon i {
    font-size: 14px;
    color: var(--on-surface-variant);
}

.icp-icon img {
    width: 16px;
    height: 16px;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 100;
}

.toggle-button {
    background: var(--surface);
    border: none;
    border-radius: 50%;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: var(--elevation-2);
    color: var(--on-surface);
    transition: all 0.3s var(--transition);
}

.toggle-button:hover {
    background: var(--primary-container);
    color: var(--primary);
}

@media (max-width: 768px) {
    .card-grid {
        grid-template-columns: 1fr;
    }
    
    .icp {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }
    
    .icp a {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .features-container {
        flex-direction: column;
        align-items: center;
    }
    
    .feature-item {
        width: 100%;
        max-width: 300px;
    }
}