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

body {
    font-family: 'Roboto', 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    color: #ffffff;
    line-height: 1.6;
    min-height: 100vh;
}

.header {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid #333;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: 8px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 500;
    color: #4285f4;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.language-switch {
    display: flex;
    gap: 0.5rem;
}

.lang-btn {
    background: transparent;
    border: 1px solid #666;
    color: #ffffff;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9rem;
}

.lang-btn:hover {
    background: #4285f4;
    border-color: #4285f4;
}

.lang-btn.active {
    background: #4285f4;
    border-color: #4285f4;
}

.privacy-link {
    color: #a8c5ff;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 20px;
    transition: all 0.3s ease;
}

.privacy-link:hover {
    background: rgba(255, 255, 255, 0.1);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.hero-section {
    text-align: center;
    padding: 4rem 0;
    background: linear-gradient(45deg, #1565c0 0%, #1976d2 50%, #42a5f5 100%);
    margin: 2rem 0;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.features-section {
    padding: 2rem 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
    color: #4285f4;
    font-weight: 600;
}

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

.feature-card {
    background: linear-gradient(135deg, #2d2d2d 0%, #3d3d3d 100%);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid #444;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(66, 133, 244, 0.2);
    border-color: #4285f4;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, #4285f4, #34a853, #fbbc05, #ea4335);
}

.feature-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #4285f4;
    font-weight: 600;
}

.feature-description {
    color: #cccccc;
    line-height: 1.8;
}

.screenshots-section {
    text-align: center;
    padding: 2rem 0;
}

.screenshots-container {
    display: flex;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-top: 2rem;
}

.screenshot {
    max-width: 400px;
    width: 100%;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    transition: all 0.3s ease;
    border: 2px solid #333;
}

.screenshot:hover {
    transform: scale(1.05);
    box-shadow: 0 30px 60px rgba(66, 133, 244, 0.3);
    border-color: #4285f4;
}

.cta-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin-top: 3rem;
}

.google-play-button {
    display: inline-flex;
    align-items: center;
    background: #000000;
    color: #ffffff;
    text-decoration: none;
    padding: 16px 26px;
    border-radius: 8px;
    font-family: 'Roboto', sans-serif;
    transition: all 0.3s ease;
    border: 2px solid #ffffff;
    gap: 14px;
    min-width: 200px;
    position: relative;
    overflow: hidden;
    transform: scale(1.1);
}

.google-play-button:hover {
    background: #1a1a1a;
    transform: scale(1.1) translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 255, 255, 0.2);
    border-color: #ffffff;
}

.google-play-button:active {
    transform: scale(1.1) translateY(0);
    box-shadow: 0 4px 10px rgba(255, 255, 255, 0.1);
}

.google-play-content {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    flex: 1;
}

.google-play-text-top {
    font-size: 10px;
    font-weight: 400;
    line-height: 1;
    color: #ffffff;
    margin-bottom: 2px;
    letter-spacing: 0.5px;
}

.google-play-text-main {
    font-size: 18px;
    font-weight: 400;
    line-height: 1;
    color: #ffffff;
}

.google-play-icon {
    display: flex;
    align-items: center;
    color: #ffffff;
}

.footer {
    background: rgba(0, 0, 0, 0.8);
    text-align: center;
    padding: 2rem;
    border-top: 1px solid #333;
    margin-top: 4rem;
}

.footer-text {
    color: #999;
    font-size: 0.9rem;
}

/* 響應式設計 */
@media (max-width: 768px) {
    .header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.1rem;
    }

    .container {
        padding: 1rem;
    }

    .screenshots-container {
        flex-direction: column;
        align-items: center;
    }

    .language-switch {
        order: -1;
    }

    .google-play-button {
        padding: 14px 20px;
        min-width: 180px;
        gap: 12px;
        transform: scale(1.05);
    }

    .google-play-text-main {
        font-size: 16px;
    }
}

/* 隱藏類別 */
.hidden {
    display: none;
}

/* 平滑過渡 */
.fade-in {
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}