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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========== 欢迎页面 ========== */
.welcome-page {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}

.welcome-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.welcome-content {
    text-align: center;
    z-index: 10;
    animation: fadeInUp 1s ease-out;
}

.welcome-title {
    font-size: 3.5rem;
    color: #fff;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.2);
}

.welcome-subtitle {
    font-size: 1.5rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 3rem;
}

.enter-btn {
    display: inline-block;
    padding: 18px 50px;
    background: #fff;
    color: #667eea;
    text-decoration: none;
    border-radius: 50px;
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.enter-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.3);
}

.about-link {
    display: inline-block;
    margin-top: 4rem;
    color: rgba(255,255,255,0.6);
    text-decoration: none;
    font-size: 0.8rem;
    padding: 0.4rem 1rem;
    border: 1px solid rgba(255,255,255,0.3);
    border-radius: 15px;
    transition: all 0.3s;
}

.about-link:hover {
    color: rgba(255,255,255,1);
    border-color: rgba(255,255,255,0.6);
    background: rgba(255,255,255,0.1);
}

/* ========== 粒子动画 ========== */
.particles span {
    position: absolute;
    width: 20px;
    height: 20px;
    background: rgba(255,255,255,0.3);
    border-radius: 50%;
    animation: float 15s infinite;
}

.particles span:nth-child(1) { left: 10%; animation-delay: 0s; }
.particles span:nth-child(2) { left: 30%; animation-delay: 2s; }
.particles span:nth-child(3) { left: 50%; animation-delay: 4s; }
.particles span:nth-child(4) { left: 70%; animation-delay: 6s; }
.particles span:nth-child(5) { left: 90%; animation-delay: 8s; }

/* ========== 动画关键帧 ========== */
@keyframes float {
    0%, 100% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 1; }
    90% { opacity: 1; }
    100% { transform: translateY(-100vh) scale(1); opacity: 0; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========== 页面布局 ========== */
.software-page {
    background: #f5f7fa;
}

.header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.header-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    color: #fff;
    text-decoration: none;
    font-weight: 700;
}

.nav {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.nav-link {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    margin: 0;
    box-sizing: border-box;
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    transition: background 0.3s;
}

.nav-link:hover,
.nav-link.active {
    background: rgba(255,255,255,0.2);
}

.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 3rem 2rem;
    flex: 1;
}

/* ========== 工具网站 ========== */
.section-title {
    font-size: 2rem;
    color: #333;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 3px solid #667eea;
    display: inline-block;
}

.software-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
}

.software-card {
    background: #fff;
    border-radius: 15px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 5px 20px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
    width: 280px;
    flex-shrink: 0;
}

.software-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.15);
}

.software-card.placeholder {
    border: 2px dashed #ddd;
    background: #fafafa;
}

.card-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.card-title {
    font-size: 1.3rem;
    color: #333;
    margin-bottom: 0.5rem;
}

.card-desc {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.6;
}

.card-download {
    display: inline-block;
    margin-top: 1rem;
    padding: 10px 25px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    text-decoration: none;
    border-radius: 25px;
    font-size: 0.9rem;
    transition: all 0.3s ease;
}

.card-download:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(102,126,234,0.4);
}

/* ========== 页脚 ========== */
.footer {
    background: #333;
    color: #fff;
    text-align: center;
    padding: 1.5rem;
    margin-top: auto;
    position: relative;
    bottom: 0;
    width: 100%;
}