/* 登录页面样式 - 炫酷版本 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    overflow: hidden;
    position: relative;
}

/* 动态渐变背景 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(-45deg, #667eea, #764ba2, #f093fb, #f5576c);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    z-index: -2;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* 粒子背景容器 */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.login-container {
    width: 100%;
    max-width: 420px;
    position: relative;
    z-index: 10;
}

.login-box {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: 20px;
    box-shadow: 
        0 20px 60px rgba(0, 0, 0, 0.3),
        0 0 0 1px rgba(255, 255, 255, 0.2) inset;
    overflow: hidden;
    animation: slideUp 0.6s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.login-header {
    text-align: center;
    padding: 45px 35px 25px;
    position: relative;
    overflow: hidden;
}

.login-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: linear-gradient(90deg, transparent, #667eea, transparent);
    border-radius: 2px;
}

.logo {
    margin-bottom: 20px;
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.login-header h1 {
    font-size: 32px;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 15px;
    color: #666;
    font-weight: 400;
}

.login-form {
    padding: 0 35px 35px;
}

.form-group {
    margin-bottom: 22px;
    position: relative;
}

.form-group label {
    display: block;
    font-size: 13px;
    color: #555;
    margin-bottom: 8px;
    font-weight: 600;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 10px;
    font-size: 14px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    background: #fafafa;
}

.form-group input:focus {
    outline: none;
    border-color: #667eea;
    background: white;
    box-shadow: 
        0 0 0 4px rgba(102, 126, 234, 0.1),
        0 4px 12px rgba(102, 126, 234, 0.15);
    transform: translateY(-2px);
}

.form-group input::placeholder {
    color: #aaa;
    transition: opacity 0.3s;
}

.form-group input:focus::placeholder {
    opacity: 0.5;
}

.form-options {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 25px;
}

.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    font-size: 14px;
    color: #666;
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
    width: 18px;
    height: 18px;
    accent-color: #667eea;
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    margin-bottom: 15px;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.5px;
}

.login-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.login-btn:hover {
    transform: translateY(-3px);
    box-shadow: 
        0 10px 30px rgba(102, 126, 234, 0.4),
        0 0 0 1px rgba(102, 126, 234, 0.1) inset;
}

.login-btn:hover::before {
    left: 100%;
}

.login-btn:active {
    transform: translateY(-1px);
}

.error-msg {
    background: linear-gradient(135deg, #ffe0e0 0%, #ffcfcf 100%);
    color: #c0392b;
    padding: 12px 15px;
    border-radius: 10px;
    font-size: 14px;
    text-align: center;
    animation: shake 0.5s;
    border-left: 4px solid #e74c3c;
    box-shadow: 0 4px 12px rgba(231, 76, 60, 0.2);
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    10%, 30%, 50%, 70%, 90% { transform: translateX(-10px); }
    20%, 40%, 60%, 80% { transform: translateX(10px); }
}

.login-footer {
    background: rgba(248, 249, 250, 0.8);
    backdrop-filter: blur(10px);
    padding: 22px;
    text-align: center;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.login-footer p {
    font-size: 12px;
    color: #888;
    margin-bottom: 12px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 25px;
}

.footer-links a {
    font-size: 13px;
    color: #667eea;
    text-decoration: none;
    transition: all 0.3s;
    font-weight: 500;
    position: relative;
}

.footer-links a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, #667eea, #764ba2);
    transition: width 0.3s;
}

.footer-links a:hover {
    color: #764ba2;
}

.footer-links a:hover::after {
    width: 100%;
}

/* 响应式设计 */
@media (max-width: 480px) {
    .login-box {
        border-radius: 15px;
    }

    .login-header {
        padding: 35px 25px 20px;
    }

    .login-header h1 {
        font-size: 28px;
    }

    .login-form {
        padding: 0 25px 25px;
    }

    body {
        padding: 15px;
    }

    .login-container {
        max-width: 100%;
    }
}

/* Toast 提示 - 炫酷版本 */
.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 16px 28px;
    border-radius: 12px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(255, 255, 255, 0.2) inset;
    transform: translateX(450px);
    opacity: 0;
    transition: all 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    z-index: 10000;
    font-size: 14px;
    font-weight: 500;
}

.toast.show {
    transform: translateX(0);
    opacity: 1;
}

.toast-success {
    border-left: 5px solid #4CAF50;
    background: linear-gradient(135deg, rgba(76, 175, 80, 0.1) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.toast-error {
    border-left: 5px solid #e74c3c;
    background: linear-gradient(135deg, rgba(231, 76, 60, 0.1) 0%, rgba(255, 255, 255, 0.95) 100%);
}

.toast-info {
    border-left: 5px solid #3498db;
    background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(255, 255, 255, 0.95) 100%);
}

/* 输入框图标容器 */
.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 18px;
    color: #999;
    transition: color 0.3s;
    pointer-events: none;
}

.input-wrapper input:focus + .input-icon {
    color: #667eea;
}

/* 登录按钮内容 */
.login-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-text {
    flex: 1;
    text-align: center;
}

.btn-icon {
    font-size: 18px;
    transition: transform 0.3s;
}

.login-btn:hover .btn-icon {
    transform: translateX(5px);
}