* {
    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;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.auth-container {
    width: 100%;
    max-width: 420px;
}

.auth-card {
    background: #fff;
    border-radius: 16px;
    padding: 40px 32px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.15);
    animation: slideUp 0.5s ease;
}

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

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-header .logo {
    font-size: 48px;
    margin-bottom: 12px;
}

.auth-header h1 {
    font-size: 24px;
    color: #1a1a2e;
    font-weight: 700;
    margin-bottom: 8px;
}

.auth-header .subtitle {
    color: #6b7280;
    font-size: 14px;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-group label {
    font-size: 14px;
    font-weight: 500;
    color: #374151;
}

.form-group label .optional {
    color: #9ca3af;
    font-weight: 400;
}

.input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

.input-icon {
    position: absolute;
    left: 14px;
    font-size: 16px;
    pointer-events: none;
}

.input-wrapper input {
    width: 100%;
    padding: 12px 16px 12px 44px;
    border: 2px solid #e5e7eb;
    border-radius: 10px;
    font-size: 15px;
    color: #1f2937;
    transition: all 0.3s ease;
    outline: none;
    background: #f9fafb;
}

.input-wrapper input:focus {
    border-color: #667eea;
    background: #fff;
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

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

.btn-primary {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 8px;
    letter-spacing: 2px;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(102, 126, 234, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.auth-footer {
    text-align: center;
    margin-top: 8px;
    font-size: 14px;
    color: #6b7280;
}

.auth-footer a {
    color: #667eea;
    text-decoration: none;
    font-weight: 500;
    margin-left: 4px;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* 消息提示 */
.message {
    margin-top: 20px;
    padding: 12px 16px;
    border-radius: 8px;
    font-size: 14px;
    text-align: center;
    animation: fadeIn 0.3s ease;
}

.message.hidden {
    display: none;
}

.message.success {
    background: #ecfdf5;
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.message.error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* 移动端适配 */
@media (max-width: 480px) {
    .auth-card {
        padding: 32px 24px;
        border-radius: 12px;
    }

    .auth-header h1 {
        font-size: 20px;
    }

    .auth-header .logo {
        font-size: 40px;
    }
}