/* 登录页面样式 - 与主页统一的明亮蓝色风格 */
:root {
    --primary-color: #1890ff;
    --secondary-color: #40a9ff;
    --text-color: #333333;
    --light-text-color: #666666;
    --border-radius-size: 16px;
    --card-shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
    --card-shadow-hover: 0 22px 55px rgba(15, 23, 42, 0.18);
}

body {
    margin: 0;
    font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
    background: #f0f2f5;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    position: relative;
    overflow: hidden;
}

/* 背景装饰 */
body::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: 
        radial-gradient(circle at 20% 80%, rgba(24, 144, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(64, 169, 255, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(24, 144, 255, 0.05) 0%, transparent 40%);
    animation: floatBg 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes floatBg {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(2%, 2%) rotate(1deg); }
    66% { transform: translate(-1%, 1%) rotate(-1deg); }
}

.login-container {
    width: 100%;
    max-width: 420px;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.login-box {
    background: #ffffff;
    border: 1px solid #e5eaf0;
    border-radius: var(--border-radius-size);
    padding: 48px 40px;
    box-shadow: var(--card-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.login-box:hover {
    transform: translateY(-4px);
    box-shadow: var(--card-shadow-hover);
}

/* Logo/图标区域 */
.login-box::before {
    content: '🔐';
    display: block;
    text-align: center;
    font-size: 48px;
    margin-bottom: 16px;
    filter: drop-shadow(0 4px 8px rgba(24, 144, 255, 0.2));
}

.login-box h1 {
    color: var(--primary-color);
    text-align: center;
    margin: 0 0 8px 0;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.login-subtitle {
    text-align: center;
    color: var(--light-text-color);
    font-size: 14px;
    margin-bottom: 32px;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 10px;
    color: #111827;
    font-weight: 600;
    font-size: 14px;
    letter-spacing: 0.2px;
}

.form-group input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid #e5eaf0;
    border-radius: 14px;
    background: #ffffff;
    color: #111827;
    font-size: 14px;
    box-sizing: border-box;
    transition: all 0.25s ease;
    font-family: inherit;
}

.form-group input::placeholder {
    color: #9ca3af;
}

.form-group input:hover {
    border-color: #c0d3ff;
    background: #fafbfc;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    background: #ffffff;
    box-shadow: 0 0 0 4px rgba(24, 144, 255, 0.12), 0 4px 12px rgba(24, 144, 255, 0.08);
    transform: translateY(-1px);
}

.btn-primary {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-color);
    color: #ffffff;
    border: 1px solid var(--primary-color);
    border-radius: 14px;
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
}

.btn-primary:hover {
    background: var(--secondary-color);
    border-color: var(--secondary-color);
    box-shadow: 0 10px 24px rgba(24, 144, 255, 0.4);
    transform: translateY(-2px);
}

.btn-primary:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px rgba(24, 144, 255, 0.3);
}

.alert {
    padding: 14px 18px;
    border-radius: 12px;
    margin-bottom: 24px;
    font-size: 14px;
    line-height: 1.5;
    border-left: 4px solid;
}

.alert-error {
    background: rgba(255, 77, 79, 0.08);
    border-color: #ff4d4f;
    color: #cf1322;
}

.alert-success {
    background: rgba(82, 196, 26, 0.08);
    border-color: #52c41a;
    color: #389e0d;
}

.login-footer {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid #e5eaf0;
    text-align: center;
}

.login-footer p {
    color: var(--light-text-color);
    font-size: 12px;
    margin: 0;
    line-height: 1.6;
}

/* 返回主页链接 */
.back-link {
    display: block;
    text-align: center;
    margin-top: 24px;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.25s ease;
}

.back-link:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* 响应式适配 */
@media (max-width: 480px) {
    .login-container {
        padding: 16px;
    }
    
    .login-box {
        padding: 36px 28px;
    }
    
    .login-box h1 {
        font-size: 24px;
    }
    
    .login-box::before {
        font-size: 40px;
    }
}