* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Roboto, sans-serif;
    background: #f5f7fa;
    color: #333;
    line-height: 1.6;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    padding: 15px 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: #fff;
    text-decoration: none;
    letter-spacing: 1px;
}
.hamburger {
    display: none;
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
}
nav ul {
    list-style: none;
    display: flex;
    gap: 20px;
}
nav ul li a {
    color: #fff;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 30px;
    transition: background 0.3s, transform 0.2s;
    font-weight: 500;
}
nav ul li a:hover {
    background: rgba(255,255,255,0.25);
    transform: scale(1.05);
}
.hero {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    color: #fff;
    text-align: center;
    padding: 80px 20px;
    border-radius: 0 0 50px 50px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.1);
}
.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 15px;
    text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}
.hero p {
    font-size: 1.2rem;
    opacity: 0.9;
}
.section-title {
    text-align: center;
    font-size: 2rem;
    margin: 50px 0 30px;
    position: relative;
    color: #333;
}
.section-title::after {
    content: '';
    display: block;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    margin: 10px auto;
    border-radius: 2px;
}
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 20px 0;
}
.card {
    background: #fff;
    border-radius: 20px;
    padding: 30px 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    text-align: center;
    cursor: default;
}
.card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}
.card-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}
.card h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: #333;
}
.card p {
    color: #666;
    margin-bottom: 20px;
    font-size: 0.95rem;
}
.btn {
    display: inline-block;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    padding: 10px 30px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s;
    border: none;
    cursor: pointer;
}
.btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 25px rgba(102,126,234,0.4);
}
footer {
    background: #2d3436;
    color: #b2bec3;
    text-align: center;
    padding: 30px 20px;
    margin-top: 60px;
    border-radius: 30px 30px 0 0;
}
footer a {
    color: #74b9ff;
    text-decoration: none;
}
footer a:hover {
    text-decoration: underline;
}

/* 登录页 */
.login-page {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-box {
    background: #fff;
    padding: 40px;
    border-radius: 30px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    width: 100%;
    max-width: 400px;
}
.login-box h2 {
    text-align: center;
    margin-bottom: 30px;
    color: #333;
}
.login-box input {
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 30px;
    font-size: 1rem;
    transition: border 0.3s;
}
.login-box input:focus {
    border-color: #667eea;
    outline: none;
}
.login-box button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    color: #fff;
    border: none;
    border-radius: 30px;
    font-size: 1.1rem;
    cursor: pointer;
}
.error {
    color: #e74c3c;
    text-align: center;
    margin-bottom: 15px;
}

/* 管理后台 */
.admin-page {
    background: #f5f7fa;
    min-height: 100vh;
}
.admin-page .container {
    max-width: 1000px;
}
.admin-page h1 {
    text-align: center;
    padding: 40px 0 10px;
}
.admin-page table {
    width: 100%;
    border-collapse: collapse;
    background: #fff;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    margin: 20px 0;
}
.admin-page th, .admin-page td {
    padding: 12px 10px;
    border-bottom: 1px solid #eee;
    text-align: left;
}
.admin-page th {
    background: #667eea;
    color: #fff;
    font-weight: 600;
}
.admin-page input {
    width: 100%;
    padding: 8px;
    border: 1px solid #ddd;
    border-radius: 8px;
}
.admin-page .btn-remove {
    background: #e74c3c;
    color: #fff;
    border: none;
    padding: 6px 14px;
    border-radius: 20px;
    cursor: pointer;
}
.success {
    color: #27ae60;
    text-align: center;
    padding: 10px;
    background: #d5f5e3;
    border-radius: 10px;
    margin: 10px 0;
}

/* 内页通用样式 */
.inner-page {
    padding: 60px 0;
    min-height: 60vh;
}
.inner-page h1 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #667eea, #764ba2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.inner-page p {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 40px;
    font-size: 1.1rem;
    color: #555;
}
.generate-area {
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.generate-area textarea, .generate-area input {
    width: 100%;
    padding: 15px;
    border: 2px solid #e0e0e0;
    border-radius: 20px;
    font-size: 1rem;
    resize: vertical;
    transition: border 0.3s;
}
.generate-area textarea:focus, .generate-area input:focus {
    border-color: #667eea;
    outline: none;
}
.generate-area .btn {
    align-self: center;
    padding: 12px 40px;
}
.result-box {
    background: #fff;
    border-radius: 20px;
    padding: 30px;
    margin-top: 30px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    white-space: pre-wrap;
    min-height: 100px;
}

/* 响应式 */
@media (max-width: 768px) {
    .hamburger {
        display: block;
    }
    nav ul {
        display: none;
        flex-direction: column;
        background: rgba(0,0,0,0.1);
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        padding: 20px;
        border-radius: 0 0 20px 20px;
        background: #764ba2;
    }
    nav ul.show {
        display: flex;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
    .grid {
        grid-template-columns: 1fr;
    }
    .admin-page table {
        font-size: 0.85rem;
    }
    .admin-page input {
        font-size: 0.85rem;
    }
}